Introduction

The following are the events for the OpenJDK 22 (jdk-22.0.1+8, 10-July-2024), and Graal VM 24.0.1 (jdk-22.0.1) . The events are collected from the event configuration and the source code. Visit jfreventcollector for more information. this is also the place you can contribute additional event descriptions, if you don't want to contribute them directly to the OpenJDK. The site generator lives on GitHub too.

This page is maintained by Johannes Bechberger of the SapMachine team at SAP and contributors.

Some events have fake end times / durations, these are hidden in the event description here.

Flight Recorder

DumpReason

default profiling startTime 11 17 21 23 24

Category: Flight Recorder

Who requested the recording and why

Configuration	enabled
default	true
profiling	true

Field	Type	Description
reason	string	Reason Reason for writing recording data to disk
recordingId	int	Recording Id Id of the recording that triggered the dump, or -1 if it was not related to a recording

DataLoss

default profiling startTime 11 17 21 23 24 graal vm

Category: Flight Recorder

Data could not be copied out from a buffer, typically because of contention

Configuration	enabled
default	true
profiling	true

Field	Type	Description
amount	ulong: bytes	Amount Amount lost data
total	ulong: bytes	Total Total lost amount for thread

Flush

experimental startTime duration 14 17 21 23 24

Category: Flight Recorder

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	threshold
default	false	0 ns
profiling	false	0 ns

Field	Type	Description
flushId	ulong	Flush Identifier
elements	ulong	Elements Written
size	ulong: bytes	Size Written

Examples 3

elements	ulong	180
flushId	ulong	49
size	ulong: bytes	134068
startTime	long: millis	51504388125

elements	ulong	14630
flushId	ulong	76
size	ulong: bytes	2234608
startTime	long: millis	83401782042

elements	ulong	3469
flushId	ulong	14
size	ulong: bytes	1487736
startTime	long: millis	15069962709

ActiveRecording

default profiling startTime duration stackTrace 11 17 21 23 24

Source src/jdk.jfr/share/classes/jdk/jfr/events/ActiveRecordingEvent.java

Category: Flight Recorder

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
id	long	Id
name	string	Name Consider contributing a description to jfreventcollector.
destination	string	Destination Consider contributing a description to jfreventcollector.
disk	boolean 21+	To Disk
maxAge	long: millis	Max Age
flushInterval	long: millis 14+	Flush Interval
maxSize	long: bytes	Max Size
recordingStart	long: epochmillis	Start Time
recordingDuration	long: millis	Recording Duration

Examples 3

destination	string	[...]/code/experiments/jfreventcollector/jfr/sample_UseG1GC.jfr
disk	boolean	true
flushInterval	long: millis	1000
id	long	1
maxAge	long: millis	9223372036854775807
maxSize	long: bytes	262144000
name	string	1
recordingDuration	long: millis	9223372036854775807
recordingStart	long: epochmillis	1702902685041
stackTrace	StackTrace	null
startTime	long: millis	27595754375

destination	string	[...]/code/experiments/jfreventcollector/jfr/sample_UseSerialGC.jfr
disk	boolean	true
flushInterval	long: millis	1000
id	long	1
maxAge	long: millis	9223372036854775807
maxSize	long: bytes	262144000
name	string	1
recordingDuration	long: millis	9223372036854775807
recordingStart	long: epochmillis	1702899981921
stackTrace	StackTrace	null
startTime	long: millis	30518224250

destination	string	[...]/code/experiments/jfreventcollector/jfr/sample_UseParallelGC.jfr
disk	boolean	true
flushInterval	long: millis	1000
id	long	1
maxAge	long: millis	9223372036854775807
maxSize	long: bytes	262144000
name	string	1
recordingDuration	long: millis	9223372036854775807
recordingStart	long: epochmillis	1702899886817
stackTrace	StackTrace	null
startTime	long: millis	75069110792

ActiveSetting

default profiling startTime duration stackTrace 11 17 21 23 24

Source src/jdk.jfr/share/classes/jdk/jfr/events/ActiveSettingEvent.java

Category: Flight Recorder

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
id	long	Event Id
name	string	Setting Name
value	string	Setting Value

Examples 3

id	long	56
name	string	enabled
stackTrace	StackTrace	null
startTime	long: millis	669832834
value	string	true

id	long	37
name	string	period
stackTrace	StackTrace	null
startTime	long: millis	416785542
value	string	everyChunk

id	long	32
name	string	enabled
stackTrace	StackTrace	null
startTime	long: millis	360834042
value	string	true

JVM

JVMInformation

default profiling startTime duration end of every chunk 11 17 21 23 24 graal vm

Category: Java Virtual Machine

Description of JVM and the Java application

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
jvmName	string	JVM Name
jvmVersion	string	JVM Version
jvmArguments	string	JVM Command Line Arguments
jvmFlags	string	JVM Settings File Arguments
javaArguments	string	Java Application Arguments
jvmStartTime	long: epochmillis	JVM Start Time
pid	long	Process Identifier

Examples 3

javaArguments	string	[...]/code/experiments/jfreventcollector/.cache/renaissance.jar -t 5 -r 1 all
jvmArguments	string	-XX:StartFlightRecording=filename=[...]/code/experiments/jfreventcollector/jfr/sample_UseSerialGC.jfr,settings=[...]/code/experiments/jfreventcollector/.cache/jfc.jfc -XX:+UseSerialGC
jvmFlags	string	null
jvmName	string	OpenJDK 64-Bit Server VM
jvmStartTime	long: epochmillis	1702899981604
jvmVersion	string	OpenJDK 64-Bit Server VM (21.0.1+12-LTS) for bsd-aarch64 JRE (21.0.1+12-LTS), built on 2023-10-17T00:00:00Z by "admin" with clang Apple LLVM 12.0.0 (clang-1200.0.32.29)
pid	long	14273
startTime	long: millis	30518848500

javaArguments	string	[...]/code/experiments/jfreventcollector/.cache/renaissance.jar -t 5 -r 1 all
jvmArguments	string	-XX:StartFlightRecording=filename=[...]/code/experiments/jfreventcollector/jfr/sample_UseParallelGC.jfr,settings=[...]/code/experiments/jfreventcollector/.cache/jfc.jfc -XX:+UseParallelGC
jvmFlags	string	null
jvmName	string	OpenJDK 64-Bit Server VM
jvmStartTime	long: epochmillis	1702899886436
jvmVersion	string	OpenJDK 64-Bit Server VM (21.0.1+12-LTS) for bsd-aarch64 JRE (21.0.1+12-LTS), built on 2023-10-17T00:00:00Z by "admin" with clang Apple LLVM 12.0.0 (clang-1200.0.32.29)
pid	long	13981
startTime	long: millis	422523083

javaArguments	string	[...]/code/experiments/jfreventcollector/.cache/renaissance.jar -t 5 -r 1 all
jvmArguments	string	-XX:StartFlightRecording=filename=[...]/code/experiments/jfreventcollector/jfr/sample_UseG1GC.jfr,settings=[...]/code/experiments/jfreventcollector/.cache/jfc.jfc -XX:+UseG1GC
jvmFlags	string	null
jvmName	string	OpenJDK 64-Bit Server VM
jvmStartTime	long: epochmillis	1702902684442
jvmVersion	string	OpenJDK 64-Bit Server VM (21.0.1+12-LTS) for bsd-aarch64 JRE (21.0.1+12-LTS), built on 2023-10-17T00:00:00Z by "admin" with clang Apple LLVM 12.0.0 (clang-1200.0.32.29)
pid	long	21922
startTime	long: millis	36095816500

InitialSystemProperty

default profiling startTime end of every chunk 11 17 21 23 24 graal vm

Category: Java Virtual Machine

System Property at JVM start

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
key	string	Key
value	string	Value

Examples 3

key	string	java.vm.compressedOopsMode
startTime	long: millis	75961241583
value	string	Zero based

key	string	java.vm.vendor
startTime	long: millis	39218561500
value	string	Eclipse Adoptium

key	string	java.vm.specification.vendor
startTime	long: millis	58733071209
value	string	Oracle Corporation

JVM: Class Loading

ClassLoad

startTime duration eventThread stackTrace 11 17 21 23 24

Category: Java Virtual Machine / Class Loading

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	stackTrace	threshold
default	false	true	0 ms
profiling	false	true	0 ms

Field	Type	Description
loadedClass	Class	Loaded Class Consider contributing a description to jfreventcollector.
definingClassLoader	ClassLoader	Defining Class Loader Consider contributing a description to jfreventcollector.
initiatingClassLoader	ClassLoader	Initiating Class Loader Consider contributing a description to jfreventcollector.

Examples 3

definingClassLoader	ClassLoader
name	string	bootstrap
type	Class	null
initiatingClassLoader	ClassLoader
name	string	bootstrap
type	Class	null
loadedClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	48
name	string	java/util/logging/Level$KnownLevel
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.logging
name	string	java.logging
version	string	21.0.1
name	string	java/util/logging
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	55
lineNumber	int	248
method	Method
descriptor	string	(Ljava/lang/String;ILjava/lang/String;Z)V
hidden	boolean	false
modifiers	int	2
name	string	<init>
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/util/logging/Level
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.logging
name	string	java.logging
version	string	21.0.1
name	string	java/util/logging
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	450630083

definingClassLoader	ClassLoader
name	string	bootstrap
type	Class	null
initiatingClassLoader	ClassLoader
name	string	bootstrap
type	Class	null
loadedClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/security/Permissions
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/security
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	199
method	Method
descriptor	string	(Ljava/security/CodeSource;)Ljava/security/PermissionCollection;
hidden	boolean	false
modifiers	int	4
name	string	getPermissions
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/security/SecureClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/security
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	710643542

definingClassLoader	ClassLoader
name	string	bootstrap
type	Class	null
initiatingClassLoader	ClassLoader
name	string	bootstrap
type	Class	null
loadedClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	48
name	string	java/util/regex/Pattern$Ques
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util/regex
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	48
lineNumber	int	3446
method	Method
descriptor	string	(Ljava/util/regex/Pattern$Node;)Ljava/util/regex/Pattern$Node;
hidden	boolean	false
modifiers	int	2
name	string	closure
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/util/regex/Pattern
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util/regex
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	395850833

ClassDefine

startTime eventThread stackTrace 11 17 21 23 24

Category: Java Virtual Machine / Class Loading

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	stackTrace
default	false	true
profiling	false	true

Field	Type	Description
definedClass	Class	Defined Class Consider contributing a description to jfreventcollector.
definingClassLoader	ClassLoader	Defining Class Loader Consider contributing a description to jfreventcollector.

Examples 3

definedClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	1057
name	string	java/util/logging/Handler
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.logging
name	string	java.logging
version	string	21.0.1
name	string	java/util/logging
definingClassLoader	ClassLoader
name	string	bootstrap
type	Class	null
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	(Ljava/lang/String;)Ljava/lang/Class;
hidden	boolean	false
modifiers	int	266
name	string	findBootstrapClass
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	1057
name	string	java/lang/ClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	714872417

definedClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	java/security/SecureClassLoader$DebugHolder
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/security
definingClassLoader	ClassLoader
name	string	bootstrap
type	Class	null
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	30
lineNumber	int	230
method	Method
descriptor	string	(Ljava/security/SecureClassLoader$CodeSourceKey;)Ljava/security/ProtectionDomain;
hidden	boolean	false
modifiers	int	1
name	string	apply
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	java/security/SecureClassLoader$1
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/security
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	389085583

definedClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	1537
name	string	sun/util/logging/PlatformLogger$Bridge
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	sun/util/logging
definingClassLoader	ClassLoader
name	string	bootstrap
type	Class	null
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	10
lineNumber	int	66
method	Method
descriptor	string	()V
hidden	boolean	false
modifiers	int	1
name	string	<init>
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/util/logging/SimpleFormatter
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.logging
name	string	java.logging
version	string	21.0.1
name	string	java/util/logging
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	453801375

ClassRedefinition

default profiling startTime 15 17 21 23 24

Category: Java Virtual Machine / Class Loading

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
redefinedClass	Class	Redefined Class Consider contributing a description to jfreventcollector.
classModificationCount	int	Class Modification Count The number of times the class has changed
redefinitionId	ulong	Class Redefinition Id

RedefineClasses

default profiling startTime duration eventThread stackTrace 15 17 21 23 24

Category: Java Virtual Machine / Class Loading

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	stackTrace	threshold
default	true	true	0 ms
profiling	true	true	0 ms

Field	Type	Description
classCount	int	Class Count
redefinitionId	ulong	Class Redefinition Id

RetransformClasses

default profiling startTime duration eventThread stackTrace 15 17 21 23 24

Category: Java Virtual Machine / Class Loading

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	stackTrace	threshold
default	true	true	0 ms
profiling	true	true	0 ms

Field	Type	Description
classCount	int	Class Count
redefinitionId	ulong	Class Redefinition Id

ClassUnload

startTime eventThread 11 17 21 23 24

Category: Java Virtual Machine / Class Loading

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	false
profiling	false

Field	Type	Description
unloadedClass	Class	Unloaded Class Consider contributing a description to jfreventcollector.
definingClassLoader	ClassLoader	Defining Class Loader Consider contributing a description to jfreventcollector.

Examples 3

definingClassLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
startTime	long: millis	5994025292
unloadedClass	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hidden	boolean	false
modifiers	int	1057
name	string	org/sparkproject/guava/collect/ImmutableSet
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	org/sparkproject/guava/collect

definingClassLoader	ClassLoader	null
startTime	long: millis	4558346042
unloadedClass	Class
classLoader	ClassLoader	null
hidden	boolean	true
modifiers	int	32
name	string	org.apache.log4j.helpers.Loader$$InjectedInvoker+0x000000080030d800/402978317
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	org/apache/log4j/helpers

definingClassLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
startTime	long: millis	3889577167
unloadedClass	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hidden	boolean	false
modifiers	int	49
name	string	org/slf4j/LoggerFactory
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	org/slf4j

JVM: Code Cache

CodeCacheFull

default profiling startTime eventThread 11 17 21 23 24

Category: Java Virtual Machine / Code Cache

A code heap is full, this leads to disabling the compiler

Configuration	enabled
default	true
profiling	true

Field	Type	Description
codeBlobType	CodeBlobType	Code Heap Consider contributing a description to jfreventcollector.
startAddress	ulong: address	Start Address
commitedTopAddress	ulong: address	Commited Top
reservedTopAddress	ulong: address	Reserved Top
entryCount	int	Entries
methodCount	int	Methods
adaptorCount	int	Adaptors
unallocatedCapacity	ulong: bytes	Unallocated
fullCount	int	Full Count
codeCacheMaxCapacity	ulong: bytes 17+	Code Cache Maximum Capacity

CodeCacheStatistics

default profiling startTime every chunk 11 17 21 23 24

Category: Java Virtual Machine / Code Cache

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	everyChunk
profiling	true	everyChunk

Field	Type	Description
codeBlobType	CodeBlobType	Code Heap Consider contributing a description to jfreventcollector.
startAddress	ulong: address	Start Address
reservedTopAddress	ulong: address	Reserved Top
entryCount	int	Entries
methodCount	int	Methods
adaptorCount	int	Adaptors
unallocatedCapacity	ulong: bytes	Unallocated
fullCount	int	Full Count

Examples 3

adaptorCount	int	470
codeBlobType	CodeBlobType	CodeHeap 'non-nmethods'
entryCount	int	561
fullCount	int	0
methodCount	int	0
reservedTopAddress	ulong: address	4610097152
startAddress	ulong: address	4604248064
startTime	long: millis	15845298667
unallocatedCapacity	ulong: bytes	4478720

adaptorCount	int	0
codeBlobType	CodeBlobType	CodeHeap 'profiled nmethods'
entryCount	int	2300
fullCount	int	0
methodCount	int	2300
reservedTopAddress	ulong: address	4643160064
startAddress	ulong: address	4520263680
startTime	long: millis	22063169292
unallocatedCapacity	ulong: bytes	116934656

adaptorCount	int	0
codeBlobType	CodeBlobType	CodeHeap 'profiled nmethods'
entryCount	int	5869
fullCount	int	0
methodCount	int	5869
reservedTopAddress	ulong: address	5088952320
startAddress	ulong: address	4966055936
startTime	long: millis	60132243125
unallocatedCapacity	ulong: bytes	107023744

CodeCacheConfiguration

default profiling startTime end of every chunk 11 17 21 23 24

Category: Java Virtual Machine / Code Cache

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
initialSize	ulong: bytes	Initial Size
reservedSize	ulong: bytes	Reserved Size
nonNMethodSize	ulong: bytes	Non-nmethod Size
profiledSize	ulong: bytes	Profiled Size
nonProfiledSize	ulong: bytes	Non-profiled Size
expansionSize	ulong: bytes	Expansion size
minBlockLength	ulong: bytes	Minimum Block Length
startAddress	ulong: address	Start Address
reservedTopAddress	ulong: address	Reserved Top

Examples 3

expansionSize	ulong: bytes	65536
initialSize	ulong: bytes	2555904
minBlockLength	ulong: bytes	6
nonNMethodSize	ulong: bytes	5839564
nonProfiledSize	ulong: bytes	122909338
profiledSize	ulong: bytes	122909338
reservedSize	ulong: bytes	251658240
reservedTopAddress	ulong: address	5217714176
startAddress	ulong: address	4966055936
startTime	long: millis	30586818958

expansionSize	ulong: bytes	65536
initialSize	ulong: bytes	2555904
minBlockLength	ulong: bytes	6
nonNMethodSize	ulong: bytes	5839564
nonProfiledSize	ulong: bytes	122909338
profiledSize	ulong: bytes	122909338
reservedSize	ulong: bytes	251658240
reservedTopAddress	ulong: address	4733009920
startAddress	ulong: address	4481351680
startTime	long: millis	364792917

expansionSize	ulong: bytes	65536
initialSize	ulong: bytes	2555904
minBlockLength	ulong: bytes	6
nonNMethodSize	ulong: bytes	5839564
nonProfiledSize	ulong: bytes	122909338
profiledSize	ulong: bytes	122909338
reservedSize	ulong: bytes	251658240
reservedTopAddress	ulong: address	4771921920
startAddress	ulong: address	4520263680
startTime	long: millis	22150019750

JVM: Compiler

JITRestart

default profiling startTime eventThread 17 21 23 24

Category: Java Virtual Machine / Compiler

Restart of the JIT compilers after they were stopped

Configuration	enabled
default	true
profiling	true

Field	Type	Description
freedMemory	ulong: bytes	Freed Memory
codeCacheMaxCapacity	ulong: bytes	Code Cache Maximum Capacity

Compilation

default profiling startTime duration eventThread 11 17 21 23 24

Category: Java Virtual Machine / Compiler

Results of method compilation attempts

Configuration	enabled	threshold
default	true	1000 ms
profiling	true	100 ms

Field	Type	Description
compileId	int	Compilation Identifier
compiler	CompilerType 14+	Compiler Consider contributing a description to jfreventcollector.
method	Method	Method Consider contributing a description to jfreventcollector.
compileLevel	ushort	Compilation Level
succeded	boolean	Succeeded
isOsr	boolean	On Stack Replacement
codeSize	ulong: bytes	Compiled Code Size
inlinedBytes	ulong: bytes	Inlined Code Size

Examples 3

codeSize	ulong: bytes	12456
compileId	int	15589
compileLevel	ushort	4
compiler	CompilerType	c2
inlinedBytes	ulong: bytes	2984
isOsr	boolean	false
method	Method
descriptor	string	(Ljava/lang/Object;)V
hidden	boolean	false
modifiers	int	2
name	string	stripHeaders
type	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hidden	boolean	false
modifiers	int	49
name	string	com/twitter/finagle/http2/transport/common/StripHeadersHandler$
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	com/twitter/finagle/http2/transport/common
startTime	long: millis	43456098542
succeded	boolean	true

codeSize	ulong: bytes	11544
compileId	int	14536
compileLevel	ushort	4
compiler	CompilerType	c2
inlinedBytes	ulong: bytes	1900
isOsr	boolean	false
method	Method
descriptor	string	(Ljava/lang/Object;Lcom/twitter/finagle/Service;)Lcom/twitter/util/Future;
hidden	boolean	false
modifiers	int	4161
name	string	apply
type	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hidden	boolean	false
modifiers	int	33
name	string	com/twitter/finagle/http/filter/PayloadSizeFilter
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	com/twitter/finagle/http/filter
startTime	long: millis	30111316000
succeded	boolean	true

codeSize	ulong: bytes	12744
compileId	int	6015
compileLevel	ushort	4
compiler	CompilerType	c2
inlinedBytes	ulong: bytes	2843
isOsr	boolean	false
method	Method
descriptor	string	(Lscala/Option;)V
hidden	boolean	false
modifiers	int	1
name	string	create
type	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hidden	boolean	false
modifiers	int	33
name	string	akka/actor/ActorCell
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	akka/actor
startTime	long: millis	9017975750
succeded	boolean	true

CompilerPhase

default profiling startTime duration eventThread 11 17 21 23 24

Category: Java Virtual Machine / Compiler

Describes various phases of the compilation process like inlining or string optimization related phases

Configuration	enabled	threshold
default	true	60 s
profiling	true	10 s

Field	Type	Description
phase	CompilerPhaseType	Compile Phase
compileId	int	Compilation Identifier
phaseLevel	ushort	Phase Level

CompilationFailure

profiling startTime eventThread 11 17 21 23 24

Category: Java Virtual Machine / Compiler

In case a JIT compilation failed, a compilation failure is triggered, reporting the reason

Configuration	enabled
default	false
profiling	true

Field	Type	Description
failureMessage	string	Failure Message
compileId	int	Compilation Identifier

Examples 3

compileId	int	3706
failureMessage	string	concurrent class loading
startTime	long: millis	3613493750

compileId	int	24829
failureMessage	string	concurrent class loading
startTime	long: millis	58349288584

compileId	int	22930
failureMessage	string	concurrent class loading
startTime	long: millis	74091028458

CompilerInlining

startTime eventThread 11 17 21 23 24

Category: Java Virtual Machine / Compiler / Optimization

Describes the result of a method inlining attempt

Configuration	enabled
default	false
profiling	false

Field	Type	Description
compileId	int	Compilation Identifier
caller	Method	Caller Method
callee	CalleeMethod struct	Callee Method
succeeded	boolean	Succeeded
message	string	Message
bci	int	Bytecode Index

Examples 3

bci	int	2
callee	CalleeMethod
descriptor	string	(Ljava/lang/String;)Ljava/lang/AbstractStringBuilder;
name	string	append
type	string	java/lang/AbstractStringBuilder
caller	Method
descriptor	string	(Ljava/lang/String;)Ljava/lang/StringBuilder;
hidden	boolean	false
modifiers	int	1
name	string	append
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/lang/StringBuilder
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
compileId	int	1421
message	string	callee is too large
startTime	long: millis	360451333
succeeded	boolean	false

bci	int	101
callee	CalleeMethod
descriptor	string	([BI)C
name	string	getChar
type	string	java/lang/StringUTF16
caller	Method
descriptor	string	(Ljava/lang/String;I)Z
hidden	boolean	false
modifiers	int	1
name	string	startsWith
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/lang/String
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
compileId	int	1479
message	string	intrinsic
startTime	long: millis	669883292
succeeded	boolean	true

bci	int	2
callee	CalleeMethod
descriptor	string	(Ljava/lang/String;)Ljava/lang/AbstractStringBuilder;
name	string	append
type	string	java/lang/AbstractStringBuilder
caller	Method
descriptor	string	(Ljava/lang/String;)Ljava/lang/StringBuilder;
hidden	boolean	false
modifiers	int	1
name	string	append
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/lang/StringBuilder
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
compileId	int	1455
message	string	callee is too large
startTime	long: millis	414398917
succeeded	boolean	false

Deoptimization

default profiling startTime eventThread stackTrace 14 17 21 23 24

Category: Java Virtual Machine / Compiler

Describes the detection of an uncommon situation in a compiled method which may lead to deoptimization of the method

Configuration	enabled	stackTrace
default	true	false
profiling	true	true

Field	Type	Description
compileId	int	Compilation Identifier
compiler	CompilerType	Compiler Consider contributing a description to jfreventcollector.
method	Method	Method Consider contributing a description to jfreventcollector.
lineNumber	int	Line Number
bci	int	Bytecode Index
instruction	Bytecode	Instruction Consider contributing a description to jfreventcollector.
reason	DeoptimizationReason	Reason Consider contributing a description to jfreventcollector.
action	DeoptimizationAction	Action Consider contributing a description to jfreventcollector.

Examples 3

action	DeoptimizationAction	reinterpret
bci	int	11
compileId	int	2705
compiler	CompilerType	c2
instruction	Bytecode	ifeq
lineNumber	int	132
method	Method
descriptor	string	(Ljava/util/function/Consumer;)V
hidden	boolean	false
modifiers	int	1
name	string	forEachRemaining
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	1537
name	string	java/util/Iterator
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util
reason	DeoptimizationReason	unstable_if
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	11
lineNumber	int	132
method	Method
descriptor	string	(Ljava/util/function/Consumer;)V
hidden	boolean	false
modifiers	int	1
name	string	forEachRemaining
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	1537
name	string	java/util/Iterator
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util
type	FrameType	JIT compiled
		…
truncated	boolean	false
startTime	long: millis	1110221375

action	DeoptimizationAction	reinterpret
bci	int	6
compileId	int	2586
compiler	CompilerType	c2
instruction	Bytecode	ifeq
lineNumber	int	2043
method	Method
descriptor	string	(I)Z
hidden	boolean	false
modifiers	int	2
name	string	has
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/util/regex/Pattern
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util/regex
reason	DeoptimizationReason	unstable_if
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	6
lineNumber	int	2043
method	Method
descriptor	string	(I)Z
hidden	boolean	false
modifiers	int	2
name	string	has
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/util/regex/Pattern
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util/regex
type	FrameType	JIT compiled
		…
truncated	boolean	false
startTime	long: millis	4291884042

action	DeoptimizationAction	maybe_recompile
bci	int	121
compileId	int	2601
compiler	CompilerType	c2
instruction	Bytecode	invokevirtual
lineNumber	int	1767
method	Method
descriptor	string	(I)Z
hidden	boolean	false
modifiers	int	0
name	string	search
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/util/regex/Matcher
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util/regex
reason	DeoptimizationReason	class_check
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	121
lineNumber	int	1767
method	Method
descriptor	string	(I)Z
hidden	boolean	false
modifiers	int	0
name	string	search
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/util/regex/Matcher
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util/regex
type	FrameType	Inlined
		…
truncated	boolean	false
startTime	long: millis	2032662292

CompilerQueueUtilization

default profiling startTime duration every chunk 22 23 24

Category: Java Virtual Machine / Compiler

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	10 s
profiling	true	5 s

Field	Type	Description
compiler	CompilerType	Compiler Consider contributing a description to jfreventcollector.
addedRate	long: hertz	Requets Added Rate Requests added per second
removedRate	long: hertz	Requests Removed Rate Requests removed per second
queueSize	long	Queue Size
peakQueueSize	long	Peak Queue Size
addedCount	long	Requests Added
removedCount	long	Requests Removed
totalAddedCount	long	Total Requests Added
totalRemovedCount	long	Total Requests Removed
compilerThreadCount	int	Compiler Thread Count

CompilerStatistics

default profiling startTime every chunk 11 17 21 23 24

Category: Java Virtual Machine / Compiler

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	1000 ms
profiling	true	1000 ms

Field	Type	Description
compileCount	int	Compiled Methods
bailoutCount	int	Bailouts
invalidatedCount	int	Invalidated Compilations
osrCompileCount	int	OSR Compilations
standardCompileCount	int	Standard Compilations
osrBytesCompiled	ulong: bytes	OSR Bytes Compiled
standardBytesCompiled	ulong: bytes	Standard Bytes Compiled
nmethodsSize	ulong: bytes	Compilation Resulting Size
nmethodCodeSize	ulong: bytes	Compilation Resulting Code Size
peakTimeSpent	long: millis	Peak Time
totalTimeSpent	long: millis	Total time

Examples 3

bailoutCount	int	4
compileCount	int	33534
invalidatedCount	int	0
nmethodCodeSize	ulong: bytes	43613600
nmethodsSize	ulong: bytes	66780392
osrBytesCompiled	ulong: bytes	0
osrCompileCount	int	238
peakTimeSpent	long: millis	1169
standardBytesCompiled	ulong: bytes	0
standardCompileCount	int	33296
startTime	long: millis	86161747042
totalTimeSpent	long: millis	66663

bailoutCount	int	2
compileCount	int	17346
invalidatedCount	int	0
nmethodCodeSize	ulong: bytes	22882248
nmethodsSize	ulong: bytes	35112016
osrBytesCompiled	ulong: bytes	0
osrCompileCount	int	143
peakTimeSpent	long: millis	1103
standardBytesCompiled	ulong: bytes	0
standardCompileCount	int	17203
startTime	long: millis	45791732500
totalTimeSpent	long: millis	56210

bailoutCount	int	3
compileCount	int	34137
invalidatedCount	int	0
nmethodCodeSize	ulong: bytes	43788632
nmethodsSize	ulong: bytes	67440896
osrBytesCompiled	ulong: bytes	0
osrCompileCount	int	230
peakTimeSpent	long: millis	1360
standardBytesCompiled	ulong: bytes	0
standardCompileCount	int	33907
startTime	long: millis	96437423708
totalTimeSpent	long: millis	82798

CompilerConfiguration

default profiling startTime end of every chunk 11 17 21 23 24

Category: Java Virtual Machine / Compiler

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
threadCount	int	Thread Count
tieredCompilation	boolean	Tiered Compilation
dynamicCompilerThreadCount	boolean 20+	Uses Dynamic Number of Compiler Threads

Examples 3

dynamicCompilerThreadCount	boolean	true
startTime	long: millis	88125694458
threadCount	int	4
tieredCompilation	boolean	true

dynamicCompilerThreadCount	boolean	true
startTime	long: millis	93747381542
threadCount	int	4
tieredCompilation	boolean	true

dynamicCompilerThreadCount	boolean	true
startTime	long: millis	58734925084
threadCount	int	4
tieredCompilation	boolean	true

JVM: Diagnostics

SyncOnValueBasedClass

experimental default profiling startTime eventThread stackTrace 16 17 21 23 24

Category: Java Virtual Machine / Diagnostics

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	stackTrace
default	true	true
profiling	true	true

Field	Type	Description
valueBasedClass	Class	Value Based Class Consider contributing a description to jfreventcollector.

HeapDump

default profiling startTime duration eventThread stackTrace 15 17 21 23 24

Category: Java Virtual Machine / Diagnostics

Information about a successfully written Java heap dump

Configuration	enabled	stackTrace	threshold
default	true	true	0 ns
profiling	true	true	0 ns

Field	Type	Description
destination	string	Destination Path of the Dump
size	long	Size
gcBeforeDump	boolean	GC Before Dump
onOutOfMemoryError	boolean	Heap Dump on Out of Memory Error
overwrite	boolean 21+	Overwrite Heap dump overwrites previous file location if it exists
compression	int 21+	Compression Level Compression level of the dump, if larger than 0 we use gzip compression with this level

JavaAgent

default profiling startTime end of every chunk 21 23 24

Category: Java Virtual Machine / Diagnostics

A Java programming language agent making use of the java.lang.instrument package for instrumenting programs running on the JVM

Configuration	enabled	period
default	true	endChunk
profiling	true	endChunk

Field	Type	Description
name	string	Name
options	string	Options
dynamic	boolean	Dynamic If the agent attached to the JVM dynamically during runtime, i.e. not at startup
initializationTime	Ticks	Initialization Time The time the JVM initialized the agent
initializationDuration	Tickspan	Initialization Duration The duration of executing the initialization method, either premain or agentmain

NativeAgent

default profiling startTime end of every chunk 21 23 24

Category: Java Virtual Machine / Diagnostics

A native programming language agent making use of the JVMTI interface used by development, profiling and monitoring tools

Configuration	enabled	period
default	true	endChunk
profiling	true	endChunk

Field	Type	Description
name	string	Name
options	string	Options
dynamic	boolean	Dynamic If the library attached to the JVM dynamically during runtime, i.e. not at startup
initializationTime	Ticks	Initialization Time The time the JVM initialized the agent
initializationDuration	Tickspan	Initialization Duration The duration of executing the JVMTI VMInit event callback. If no VMInit callback is specified, the duration is 0. For a dynamically loaded agent, it is the duration of executing the call to Agent_OnAttach.
path	string	Path The path of the library

JVM: Flag

IntFlagChanged

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / Flag

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
name	string	Name
oldValue	int	Old Value
newValue	int	New Value
origin	FlagValueOrigin	Origin Consider contributing a description to jfreventcollector.

UnsignedIntFlagChanged

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / Flag

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
name	string	Name
oldValue	uint	Old Value
newValue	uint	New Value
origin	FlagValueOrigin	Origin Consider contributing a description to jfreventcollector.

LongFlagChanged

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / Flag

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
name	string	Name
oldValue	long	Old Value
newValue	long	New Value
origin	FlagValueOrigin	Origin Consider contributing a description to jfreventcollector.

UnsignedLongFlagChanged

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / Flag

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
name	string	Name
oldValue	ulong	Old Value
newValue	ulong	New Value
origin	FlagValueOrigin	Origin Consider contributing a description to jfreventcollector.

DoubleFlagChanged

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / Flag

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
name	string	Name
oldValue	double	Old Value
newValue	double	New Value
origin	FlagValueOrigin	Origin Consider contributing a description to jfreventcollector.

BooleanFlagChanged

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / Flag

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
name	string	Name
oldValue	boolean	Old Value
newValue	boolean	New Value
origin	FlagValueOrigin	Origin Consider contributing a description to jfreventcollector.

StringFlagChanged

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / Flag

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
name	string	Name
oldValue	string	Old Value
newValue	string	New Value
origin	FlagValueOrigin	Origin Consider contributing a description to jfreventcollector.

IntFlag

default profiling startTime duration end of every chunk 11 17 21 23 24

Category: Java Virtual Machine / Flag

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
name	string	Name
value	int	Value
origin	FlagValueOrigin	Origin Consider contributing a description to jfreventcollector.

Examples 3

name	string	VerifyMetaspaceInterval
origin	FlagValueOrigin	Default
startTime	long: millis	12863172625
value	int	0

name	string	SoftwarePrefetchHintDistance
origin	FlagValueOrigin	Default
startTime	long: millis	39268372958
value	int	384

name	string	JavaPriority2_To_OSPriority
origin	FlagValueOrigin	Default
startTime	long: millis	30519911375
value	int	-1

UnsignedIntFlag

default profiling startTime duration end of every chunk 11 17 21 23 24

Category: Java Virtual Machine / Flag

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
name	string	Name
value	uint	Value
origin	FlagValueOrigin	Origin Consider contributing a description to jfreventcollector.

Examples 3

name	string	ErrorHandlerTest
origin	FlagValueOrigin	Default
startTime	long: millis	36097510834
value	uint	0

name	string	G1RemSetArrayOfCardsEntriesBase
origin	FlagValueOrigin	Default
startTime	long: millis	364799833
value	uint	8

name	string	TypeProfileLevel
origin	FlagValueOrigin	Default
startTime	long: millis	78960120042
value	uint	111

LongFlag

default profiling startTime duration end of every chunk 11 17 21 23 24

Category: Java Virtual Machine / Flag

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
name	string	Name
value	long	Value
origin	FlagValueOrigin	Origin Consider contributing a description to jfreventcollector.

Examples 3

name	string	Tier2BackEdgeThreshold
origin	FlagValueOrigin	Default
startTime	long: millis	676086292
value	long	0

name	string	PrintIdealGraphPort
origin	FlagValueOrigin	Default
startTime	long: millis	423470458
value	long	4444

name	string	TieredCompileTaskTimeout
origin	FlagValueOrigin	Default
startTime	long: millis	364812042
value	long	50

UnsignedLongFlag

default profiling startTime duration end of every chunk 11 17 21 23 24

Category: Java Virtual Machine / Flag

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
name	string	Name
value	ulong	Value
origin	FlagValueOrigin	Origin Consider contributing a description to jfreventcollector.

Examples 3

name	string	LoopStripMiningIter
origin	FlagValueOrigin	Default
startTime	long: millis	423575792
value	ulong	0

name	string	TenuredGenerationSizeSupplementDecay
origin	FlagValueOrigin	Default
startTime	long: millis	676116959
value	ulong	2

name	string	SurvivorRatio
origin	FlagValueOrigin	Default
startTime	long: millis	364826167
value	ulong	8

DoubleFlag

default profiling startTime duration end of every chunk 11 17 21 23 24

Category: Java Virtual Machine / Flag

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
name	string	Name
value	double	Value
origin	FlagValueOrigin	Origin Consider contributing a description to jfreventcollector.

Examples 3

name	string	SweeperThreshold
origin	FlagValueOrigin	Default
startTime	long: millis	84416262375
value	double	15.0

name	string	CompileThresholdScaling
origin	FlagValueOrigin	Default
startTime	long: millis	423590875
value	double	1.0

name	string	ZYoungCompactionLimit
origin	FlagValueOrigin	Default
startTime	long: millis	58734966417
value	double	25.0

BooleanFlag

default profiling startTime duration end of every chunk 11 17 21 23 24

Category: Java Virtual Machine / Flag

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
name	string	Name
value	boolean	Value
origin	FlagValueOrigin	Origin Consider contributing a description to jfreventcollector.

Examples 3

name	string	CanonicalizeNodes
origin	FlagValueOrigin	Default
startTime	long: millis	423598625
value	boolean	true

name	string	ImplicitDiv0Checks
origin	FlagValueOrigin	Default
startTime	long: millis	364841375
value	boolean	true

name	string	C1UpdateMethodData
origin	FlagValueOrigin	Default
startTime	long: millis	676160917
value	boolean	true

StringFlag

default profiling startTime duration end of every chunk 11 17 21 23 24

Category: Java Virtual Machine / Flag

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
name	string	Name
value	string	Value
origin	FlagValueOrigin	Origin Consider contributing a description to jfreventcollector.

Examples 3

name	string	ArchiveHeapTestClass
origin	FlagValueOrigin	Default
startTime	long: millis	12863352875
value	string	null

name	string	CompileCommandFile
origin	FlagValueOrigin	Default
startTime	long: millis	364878875
value	string	null

name	string	ShenandoahGCMode
origin	FlagValueOrigin	Default
startTime	long: millis	30586900250
value	string	satb

JVM: GC: Collector

GarbageCollection

default profiling startTime duration eventThread 11 17 21 23 24 graal vm

Category: Java Virtual Machine / GC / Collector

Garbage collection performed by the JVM

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
gcId	uint	GC Identifier
name	GCName	Name The name of the Garbage Collector
cause	GCCause	Cause The reason for triggering this Garbage Collection
sumOfPauses	Tickspan	Sum of Pauses Sum of all the times in which Java execution was paused during the garbage collection
longestPause	Tickspan	Longest Pause Longest individual pause during the garbage collection

Examples 3

cause	GCCause	Allocation Failure
gcId	uint	35
longestPause	Tickspan	5560083
name	GCName	DefNew
startTime	long: millis	2027276375
sumOfPauses	Tickspan	5560083

cause	GCCause	Allocation Failure
gcId	uint	70
longestPause	Tickspan	340615000
name	GCName	ParallelScavenge
startTime	long: millis	54078136125
sumOfPauses	Tickspan	340615000

cause	GCCause	G1 Evacuation Pause
gcId	uint	11
longestPause	Tickspan	16873541
name	GCName	G1New
startTime	long: millis	1775252334
sumOfPauses	Tickspan	16873541

SystemGC

default profiling startTime duration eventThread stackTrace 17 21 23 24 graal vm

Category: Java Virtual Machine / GC / Collector

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	stackTrace	threshold
default	true	true	0 ms
profiling	true	true	0 ms

Field	Type	Description
invokedConcurrent	boolean	Invoked Concurrent

Examples 3

invokedConcurrent	boolean	false
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	()V
hidden	boolean	false
modifiers	int	257
name	string	gc
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/Runtime
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	45628555917

invokedConcurrent	boolean	false
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	()V
hidden	boolean	false
modifiers	int	257
name	string	gc
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/Runtime
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	4398896292

invokedConcurrent	boolean	false
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	()V
hidden	boolean	false
modifiers	int	257
name	string	gc
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/Runtime
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	36499479750

ParallelOldGarbageCollection

default profiling startTime duration 11 17 21 23 24

Category: Java Virtual Machine / GC / Collector

Appearing in: ParallelGC

Missing in: G1GC, SerialGC, ShenandoahGC, ZGC

Extra information specific to Parallel Old Garbage Collections

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
gcId	uint	GC Identifier
densePrefix	ulong: address	Dense Prefix The address of the dense prefix, used when compacting

Examples 1

ParallelGC

densePrefix	ulong: address	30146560000
gcId	uint	52
startTime	long: millis	29661553625

YoungGarbageCollection

default profiling startTime duration 11 17 21 23 24

Category: Java Virtual Machine / GC / Collector

Appearing in: G1GC, ParallelGC, SerialGC

Missing in: ShenandoahGC, ZGC

Extra information specific to Young Garbage Collections

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
gcId	uint	GC Identifier
tenuringThreshold	uint	Tenuring Threshold

Examples 3

gcId	uint	103
startTime	long: millis	72821095000
tenuringThreshold	uint	15

gcId	uint	109
startTime	long: millis	39624946459
tenuringThreshold	uint	15

gcId	uint	14
startTime	long: millis	1708659125
tenuringThreshold	uint	4

OldGarbageCollection

default profiling startTime duration 11 17 21 23 24

Category: Java Virtual Machine / GC / Collector

Appearing in: G1GC, ParallelGC, SerialGC

Missing in: ShenandoahGC, ZGC

Extra information specific to Old Garbage Collections

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
gcId	uint	GC Identifier

Examples 3

gcId	uint	426
startTime	long: millis	98982812625

gcId	uint	43
startTime	long: millis	12401975459

gcId	uint	108
startTime	long: millis	75089372333

G1GarbageCollection

default profiling startTime duration 11 17 21 23 24

Category: Java Virtual Machine / GC / Collector

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

Extra information specific to G1 Young Garbage Collections

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
gcId	uint	GC Identifier
type	G1YCType	Type Consider contributing a description to jfreventcollector.

Examples 1

G1GC

gcId	uint	89
startTime	long: millis	31189713875
type	G1YCType	Normal

ZYoungGarbageCollection

default profiling startTime duration eventThread 21 23 24

Category: Java Virtual Machine / GC / Collector

Extra information specific to ZGC Young Garbage Collections

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
gcId	uint	GC Identifier
tenuringThreshold	uint	Tenuring Threshold

ZOldGarbageCollection

default profiling startTime duration eventThread 21 23 24

Category: Java Virtual Machine / GC / Collector

Extra information specific to ZGC Old Garbage Collections

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
gcId	uint	GC Identifier

JVM: GC: Configuration

GCConfiguration

default profiling startTime duration end of every chunk 11 17 21 23 24

Category: Java Virtual Machine / GC / Configuration

The configuration of the garbage collector

Configuration	enabled	period
default	true	everyChunk
profiling	true	everyChunk

Field	Type	Description
youngCollector	GCName	Young Garbage Collector The garbage collector used for the young generation
oldCollector	GCName	Old Garbage Collector The garbage collector used for the old generation
parallelGCThreads	uint	Parallel GC Threads Number of parallel threads to use for garbage collection
concurrentGCThreads	uint	Concurrent GC Threads Number of concurrent threads to use for garbage collection
usesDynamicGCThreads	boolean	Uses Dynamic GC Threads Whether a dynamic number of GC threads are used or not
isExplicitGCConcurrent	boolean	Concurrent Explicit GC Whether System.gc() is concurrent or not
isExplicitGCDisabled	boolean	Disabled Explicit GC Whether System.gc() will cause a garbage collection or not
pauseTarget	long: millis	Pause Target Target for GC pauses
gcTimeRatio	uint	GC Time Ratio Target for runtime vs garbage collection time

Examples 3

concurrentGCThreads	uint	2
gcTimeRatio	uint	12
isExplicitGCConcurrent	boolean	false
isExplicitGCDisabled	boolean	false
oldCollector	GCName	G1Old
parallelGCThreads	uint	8
pauseTarget	long: millis	-9223372036854775808
startTime	long: millis	78213061250
usesDynamicGCThreads	boolean	true
youngCollector	GCName	G1New

concurrentGCThreads	uint	0
gcTimeRatio	uint	99
isExplicitGCConcurrent	boolean	false
isExplicitGCDisabled	boolean	false
oldCollector	GCName	SerialOld
parallelGCThreads	uint	0
pauseTarget	long: millis	-9223372036854775808
startTime	long: millis	30690531583
usesDynamicGCThreads	boolean	true
youngCollector	GCName	DefNew

concurrentGCThreads	uint	0
gcTimeRatio	uint	99
isExplicitGCConcurrent	boolean	false
isExplicitGCDisabled	boolean	false
oldCollector	GCName	ParallelOld
parallelGCThreads	uint	8
pauseTarget	long: millis	-9223372036854775808
startTime	long: millis	75047469167
usesDynamicGCThreads	boolean	true
youngCollector	GCName	ParallelScavenge

GCSurvivorConfiguration

default profiling startTime duration end of every chunk 11 17 21 23 24

Category: Java Virtual Machine / GC / Configuration

The configuration of the survivors of garbage collection

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
maxTenuringThreshold	ubyte	Maximum Tenuring Threshold Upper limit for the age of how old objects to keep in the survivor area
initialTenuringThreshold	ubyte	Initial Tenuring Threshold Initial age limit for how old objects to keep in survivor area

Examples 3

initialTenuringThreshold	ubyte	7
maxTenuringThreshold	ubyte	15
startTime	long: millis	52241833167

initialTenuringThreshold	ubyte	7
maxTenuringThreshold	ubyte	15
startTime	long: millis	79064864500

initialTenuringThreshold	ubyte	7
maxTenuringThreshold	ubyte	15
startTime	long: millis	27650268875

GCTLABConfiguration

default profiling startTime duration end of every chunk 11 17 21 23 24

Category: Java Virtual Machine / GC / Configuration

The configuration of the Thread Local Allocation Buffers (TLABs)

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
usesTLABs	boolean	TLABs Used If Thread Local Allocation Buffers (TLABs) are in use
minTLABSize	ulong: bytes	Minimum TLAB Size
tlabRefillWasteLimit	ulong: bytes	TLAB Refill Waste Limit

Examples 3

minTLABSize	ulong: bytes	2048
startTime	long: millis	96932669625
tlabRefillWasteLimit	ulong: bytes	64
usesTLABs	boolean	true

minTLABSize	ulong: bytes	2048
startTime	long: millis	436497958
tlabRefillWasteLimit	ulong: bytes	64
usesTLABs	boolean	true

minTLABSize	ulong: bytes	2048
startTime	long: millis	692409084
tlabRefillWasteLimit	ulong: bytes	64
usesTLABs	boolean	true

GCHeapConfiguration

default profiling startTime duration end of every chunk 11 17 21 23 24

Category: Java Virtual Machine / GC / Configuration

The configuration of the garbage collected heap

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
minSize	ulong: bytes	Minimum Heap Size
maxSize	ulong: bytes	Maximum Heap Size
initialSize	ulong: bytes	Initial Heap Size
usesCompressedOops	boolean	If Compressed Oops Are Used If compressed Oops (Ordinary Object Pointers) are enabled
compressedOopsMode	NarrowOopMode	Compressed Oops Mode The kind of compressed oops being used
objectAlignment	ulong: bytes	Object Alignment Object alignment (in bytes) on the heap
heapAddressBits	ubyte	Heap Address Size Heap Address Size (in bits)

Examples 3

compressedOopsMode	NarrowOopMode	Zero based
heapAddressBits	ubyte	32
initialSize	ulong: bytes	268435456
maxSize	ulong: bytes	4294967296
minSize	ulong: bytes	8388608
objectAlignment	ulong: bytes	8
startTime	long: millis	63145624459
usesCompressedOops	boolean	true

compressedOopsMode	NarrowOopMode	Zero based
heapAddressBits	ubyte	32
initialSize	ulong: bytes	268435456
maxSize	ulong: bytes	4294967296
minSize	ulong: bytes	8388608
objectAlignment	ulong: bytes	8
startTime	long: millis	378405292
usesCompressedOops	boolean	true

compressedOopsMode	NarrowOopMode	Zero based
heapAddressBits	ubyte	32
initialSize	ulong: bytes	268435456
maxSize	ulong: bytes	4294967296
minSize	ulong: bytes	8388608
objectAlignment	ulong: bytes	8
startTime	long: millis	39413198875
usesCompressedOops	boolean	true

YoungGenerationConfiguration

default profiling startTime duration end of every chunk 11 17 21 23 24

Category: Java Virtual Machine / GC / Configuration

The configuration of the young generation of the garbage collected heap

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
minSize	ulong: bytes	Minimum Young Generation Size
maxSize	ulong: bytes	Maximum Young Generation Size
newRatio	uint	New Ratio The size of the young generation relative to the tenured generation

Examples 3

maxSize	ulong: bytes	2575302656
minSize	ulong: bytes	1363144
newRatio	uint	2
startTime	long: millis	692411584

maxSize	ulong: bytes	1431306240
minSize	ulong: bytes	89128960
newRatio	uint	2
startTime	long: millis	79064868458

maxSize	ulong: bytes	1431633920
minSize	ulong: bytes	89456640
newRatio	uint	2
startTime	long: millis	76136304042

JVM: GC: Detailed

ZThreadDebug

internal startTime duration eventThread 18 21 23 24

Category: Java Virtual Machine / GC / Detailed

Temporary latency measurements used during development and debugging of ZGC

Only valid for the ZGC.

Field	Type	Description
gcId	uint	GC Identifier
name	string	Name The name of the GC runner

G1MMU

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
gcId	uint	GC Identifier
timeSlice	long: millis	Time Slice Time slice used to calculate MMU
gcTime	long: millis	GC Time Time stopped because of GC during last time slice
pauseTarget	long: millis	Pause Target Max time allowed to be spent on GC during last time slice

Examples 1

G1GC

gcId	uint	110
gcTime	long: millis	6
pauseTarget	long: millis	200
startTime	long: millis	39657409084
timeSlice	long: millis	201

EvacuationInformation

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
gcId	uint	GC Identifier
cSetRegions	uint	Collection Set Regions
cSetUsedBefore	ulong: bytes	Collection Set Before Memory usage before GC in the collection set regions
cSetUsedAfter	ulong: bytes	Collection Set After Memory usage after GC in the collection set regions
allocationRegions	uint	Allocation Regions Regions chosen as allocation regions during evacuation (includes survivors and old space regions)
allocationRegionsUsedBefore	ulong: bytes	Allocation Regions Before Memory usage before GC in allocation regions
allocationRegionsUsedAfter	ulong: bytes	Allocation Regions After Memory usage after GC in allocation regions
bytesCopied	ulong: bytes	Bytes Copied
regionsFreed	uint	Regions Freed

Examples 1

G1GC

allocationRegions	uint	15
allocationRegionsUsedAfter	ulong: bytes	31126800
allocationRegionsUsedBefore	ulong: bytes	0
bytesCopied	ulong: bytes	31126800
cSetRegions	uint	90
cSetUsedAfter	ulong: bytes	0
cSetUsedBefore	ulong: bytes	188743680
gcId	uint	30
regionsFreed	uint	90
startTime	long: millis	8381877459

ObjectCountAfterGC

startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC, ParallelGC, SerialGC

Missing in: ShenandoahGC, ZGC

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	false
profiling	false

Field	Type	Description
gcId	uint	GC Identifier
objectClass	Class	Object Class Consider contributing a description to jfreventcollector.
count	long	Count
totalSize	ulong: bytes	Total Size

Examples 3

count	long	155283
gcId	uint	34
objectClass	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hidden	boolean	false
modifiers	int	33
name	string	akka/actor/UnstartedCell
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	akka/actor
startTime	long: millis	8979422834
totalSize	ulong: bytes	6211320

count	long	868
gcId	uint	0
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/util/ArrayList
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util
startTime	long: millis	372286000
totalSize	ulong: bytes	20832

count	long	214372
gcId	uint	28
objectClass	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hidden	boolean	false
modifiers	int	33
name	string	akka/actor/RepointableActorRef
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	akka/actor
startTime	long: millis	17449627375
totalSize	ulong: bytes	10289856

G1EvacuationYoungStatistics

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

Memory related evacuation statistics during GC for the young generation

Configuration	enabled
default	true
profiling	true

Field	Type	Description
statistics	G1EvacuationStatistics struct	Evacuation Statistics

Examples 1

G1GC

startTime	long: millis	22586559209
statistics	G1EvacuationStatistics
allocated	ulong: bytes	234432
directAllocated	ulong: bytes	11641688
failureUsed	ulong: bytes	0
failureWaste	ulong: bytes	0
gcId	uint	69
numDirectAllocated	ulong	5
numPlabsFilled	ulong	7504122885671534260
regionEndWaste	ulong: bytes	857552
regionsRefilled	uint	7
undoWaste	ulong: bytes	0
used	ulong: bytes	209408
wasted	ulong: bytes	2816

G1EvacuationOldStatistics

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

Memory related evacuation statistics during GC for the old generation

Configuration	enabled
default	true
profiling	true

Field	Type	Description
statistics	G1EvacuationStatistics struct	Evacuation Statistics

Examples 1

G1GC

startTime	long: millis	2471470959
statistics	G1EvacuationStatistics
allocated	ulong: bytes	0
directAllocated	ulong: bytes	0
failureUsed	ulong: bytes	0
failureWaste	ulong: bytes	0
gcId	uint	19
numDirectAllocated	ulong	6147041496
numPlabsFilled	ulong	0
regionEndWaste	ulong: bytes	0
regionsRefilled	uint	0
undoWaste	ulong: bytes	0
used	ulong: bytes	0
wasted	ulong: bytes	0

G1BasicIHOP

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

Basic statistics related to current IHOP calculation

Configuration	enabled
default	true
profiling	true

Field	Type	Description
gcId	uint	GC Identifier
threshold	ulong: bytes	Current IHOP Threshold Current IHOP threshold
thresholdPercentage	float: percentage	Current IHOP Threshold Current IHOP threshold in percent of old generation
targetOccupancy	ulong: bytes	Target Occupancy Target old generation occupancy to reach at the start of mixed GC
currentOccupancy	ulong: bytes	Current Occupancy Current old generation occupancy
recentMutatorAllocationSize	ulong: bytes	Recent Mutator Allocation Size Mutator allocation during mutator operation in the most recent interval
recentMutatorDuration	long: millis	Recent Mutator Duration Time the mutator ran in the most recent interval
recentAllocationRate	double: bytes-per-second	Recent Allocation Rate Allocation rate of the mutator in the most recent interval in bytes/second
lastMarkingDuration	long: millis	Last Marking Duration Last time from the end of the last concurrent start to the first mixed GC

Examples 1

G1GC

currentOccupancy	ulong: bytes	578054992
gcId	uint	52
lastMarkingDuration	long: millis	880
recentAllocationRate	double: bytes-per-second	0.0
recentMutatorAllocationSize	ulong: bytes	0
recentMutatorDuration	long: millis	550
startTime	long: millis	18186164584
targetOccupancy	ulong: bytes	2646605824
threshold	ulong: bytes	1190972620
thresholdPercentage	float: percentage	0.45

G1AdaptiveIHOP

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

Statistics related to current adaptive IHOP calculation

Configuration	enabled
default	true
profiling	true

Field	Type	Description
gcId	uint	GC Identifier
threshold	ulong: bytes	Threshold Current IHOP Threshold
thresholdPercentage	float: percentage	Threshold Current IHOP threshold in percent of the internal target occupancy
ihopTargetOccupancy	ulong: bytes	IHOP Target Occupancy Internal target old generation occupancy to reach at the start of mixed GC
currentOccupancy	ulong: bytes	Current Occupancy Current old generation occupancy
additionalBufferSize	ulong: bytes	Additional Buffer Additional buffer size
predictedAllocationRate	double: bytes-per-second	Predicted Allocation Rate Current predicted allocation rate for the mutator in bytes/second
predictedMarkingDuration	long: millis	Predicted Marking Duration Current predicted time from the end of the last concurrent start to the first mixed GC
predictionActive	boolean	Prediction Active Indicates whether the adaptive IHOP prediction is active

Examples 1

G1GC

additionalBufferSize	ulong: bytes	4194304
currentOccupancy	ulong: bytes	5115728
gcId	uint	2
ihopTargetOccupancy	ulong: bytes	13946060
predictedAllocationRate	double: bytes-per-second	29605.16708051163
predictedMarkingDuration	long: millis	0
predictionActive	boolean	false
startTime	long: millis	914795292
threshold	ulong: bytes	6606028
thresholdPercentage	float: percentage	0.4736842

PromoteObjectInNewPLAB

profiling startTime eventThread 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC, ParallelGC

Missing in: SerialGC, ShenandoahGC, ZGC

Object survived scavenge and was copied to a new Promotion Local Allocation Buffer (PLAB). Supported GCs are Parallel Scavenge, G1 and CMS with Parallel New. Due to promotion being done in parallel an object might be reported multiple times as the GC threads race to copy all objects.

Configuration	enabled
default	false
profiling	true

Field	Type	Description
gcId	uint	GC Identifier Identifier signifying GC during which the object was promoted
objectClass	Class	Object Class Class of promoted object
objectSize	ulong: bytes	Object Size Size of promoted object
tenuringAge	uint	Object Tenuring Age Tenuring age of a surviving object before being copied. The tenuring age of an object is a value between 0-15 and is incremented each scavenge the object survives. Newly allocated objects have tenuring age 0.
tenured	boolean	Tenured True if object was promoted to Old space, otherwise the object was aged and copied to a Survivor space
plabSize	ulong: bytes	PLAB Size Size of the allocated PLAB to which the object was copied

Examples 2

G1GC
ParallelGC

gcId	uint	3
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/security/Provider$Service
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/security
objectSize	ulong: bytes	64
plabSize	ulong: bytes	24064
startTime	long: millis	940142125
tenured	boolean	true
tenuringAge	uint	1

gcId	uint	5
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/lang/String
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
objectSize	ulong: bytes	24
plabSize	ulong: bytes	8176
startTime	long: millis	1164471333
tenured	boolean	true
tenuringAge	uint	1

PromoteObjectOutsidePLAB

profiling startTime eventThread 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC, ParallelGC

Missing in: SerialGC, ShenandoahGC, ZGC

Object survived scavenge and was copied directly to the heap. Supported GCs are Parallel Scavenge, G1 and CMS with Parallel New. Due to promotion being done in parallel an object might be reported multiple times as the GC threads race to copy all objects.

Configuration	enabled
default	false
profiling	true

Field	Type	Description
gcId	uint	GC Identifier Identifier signifying GC during which the object was promoted
objectClass	Class	Object Class Class of promoted object
objectSize	ulong: bytes	Object Size Size of promoted object
tenuringAge	uint	Object Tenuring Age Tenuring age of a surviving object before being copied. The tenuring age of an object is a value between 0-15 and is incremented each scavenge the object survives. Newly allocated objects have tenuring age 0.
tenured	boolean	Tenured True if object was promoted to Old space, otherwise the object was aged and copied to a Survivor space

Examples 2

ParallelGC
G1GC

gcId	uint	14
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	0
name	string	[Ljava/lang/Object;
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
objectSize	ulong: bytes	19136
startTime	long: millis	2188557708
tenured	boolean	false
tenuringAge	uint	0

gcId	uint	59
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	0
name	string	[Ljava/lang/Object;
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
objectSize	ulong: bytes	49832
startTime	long: millis	21659684167
tenured	boolean	false
tenuringAge	uint	0

PromotionFailed

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Promotion of an object failed

Configuration	enabled
default	true
profiling	true

Field	Type	Description
gcId	uint	GC Identifier
promotionFailed	CopyFailed struct	Promotion Failed Data
thread	Thread	Running thread

EvacuationFailed

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Evacuation of an object failed

Configuration	enabled
default	true
profiling	true

Field	Type	Description
gcId	uint	GC Identifier
evacuationFailed	CopyFailed struct	Evacuation Failed Data

ConcurrentModeFailure

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Concurrent Mode failed

Configuration	enabled
default	true
profiling	true

Field	Type	Description
gcId	uint	GC Identifier

GCCPUTime

default profiling startTime 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC, ParallelGC, SerialGC

Missing in: ShenandoahGC, ZGC

GC CPU Time information. Supported: G1GC, ParallelGC and SerialGC

Configuration	enabled
default	true
profiling	true

Field	Type	Description
gcId	uint	GC Identifier
userTime	ulong: nanos	User Time
systemTime	ulong: nanos	System Time
realTime	ulong: nanos	Real Time

Examples 3

gcId	uint	41
realTime	ulong: nanos	0
startTime	long: millis	4553714833
systemTime	ulong: nanos	0
userTime	ulong: nanos	9999999

gcId	uint	22
realTime	ulong: nanos	559999942
startTime	long: millis	9630206042
systemTime	ulong: nanos	100000000
userTime	ulong: nanos	1619999999

gcId	uint	40
realTime	ulong: nanos	60000181
startTime	long: millis	10759874500
systemTime	ulong: nanos	29999999
userTime	ulong: nanos	300000000

AllocationRequiringGC

startTime eventThread stackTrace 11 17 21 23 24 graal vm

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC, ParallelGC, SerialGC

Missing in: ShenandoahGC, ZGC

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	stackTrace
default	false	true
profiling	false	true

Field	Type	Description
gcId	uint	Pending GC Identifier
size	ulong: bytes	Allocation Size

Examples 3

gcId	uint	58
size	ulong: bytes	100416
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	6
lineNumber	int	3482
method	Method
descriptor	string	([Ljava/lang/Object;I)[Ljava/lang/Object;
hidden	boolean	false
modifiers	int	9
name	string	copyOf
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/util/Arrays
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util
type	FrameType	Inlined
		…
truncated	boolean	false
startTime	long: millis	21579537334

gcId	uint	87
size	ulong: bytes	24
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	10
lineNumber	int	83
method	Method
descriptor	string	(Lscala/collection/immutable/RedBlackTree$Tree;)Lscala/collection/immutable/TreeMap;
hidden	boolean	false
modifiers	int	2
name	string	newMapOrSelf
type	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hidden	boolean	false
modifiers	int	49
name	string	scala/collection/immutable/TreeMap
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	scala/collection/immutable
type	FrameType	Inlined
		…
truncated	boolean	false
startTime	long: millis	13957355375

gcId	uint	66
size	ulong: bytes	56
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	15
lineNumber	int	498
method	Method
descriptor	string	(IILscala/collection/concurrent/Gen;)Lscala/collection/concurrent/CNode;
hidden	boolean	false
modifiers	int	1
name	string	removedAt
type	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hidden	boolean	false
modifiers	int	49
name	string	scala/collection/concurrent/CNode
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	scala/collection/concurrent
type	FrameType	Inlined
		…
truncated	boolean	false
startTime	long: millis	49106287250

TenuringDistribution

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC, SerialGC

Missing in: ParallelGC, ShenandoahGC, ZGC

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
gcId	uint	GC Identifier
age	uint	Age
size	ulong: bytes	Size

Examples 2

G1GC
SerialGC

age	uint	7
gcId	uint	3
size	ulong: bytes	0
startTime	long: millis	940884917

age	uint	12
gcId	uint	7
size	ulong: bytes	0
startTime	long: millis	1241145083

G1HeapRegionTypeChange

startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

Information about a G1 heap region type change

Configuration	enabled
default	false
profiling	false

Field	Type	Description
index	uint	Index
from	G1HeapRegionType	From Consider contributing a description to jfreventcollector.
to	G1HeapRegionType	To Consider contributing a description to jfreventcollector.
start	ulong: address	Start
used	ulong: bytes	Used

Examples 1

G1GC

from	G1HeapRegionType	Eden
index	uint	66
start	ulong: address	30203183104
startTime	long: millis	1433295959
to	G1HeapRegionType	Free
used	ulong: bytes	0

ObjectCount

startTime every chunk 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC, ParallelGC, SerialGC

Missing in: ShenandoahGC, ZGC

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	false	everyChunk
profiling	false	everyChunk

Field	Type	Description
gcId	uint	GC Identifier
objectClass	Class	Object Class Consider contributing a description to jfreventcollector.
count	long	Count
totalSize	ulong: bytes	Total Size

Examples 3

count	long	25144
gcId	uint	1
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/lang/String
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
startTime	long: millis	865943958
totalSize	ulong: bytes	603456

count	long	192
gcId	uint	7
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	0
name	string	[I
package	Package	null
startTime	long: millis	1447281875
totalSize	ulong: bytes	112224

count	long	758
gcId	uint	1
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/util/HashMap
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util
startTime	long: millis	431274583
totalSize	ulong: bytes	36384

G1HeapRegionInformation

startTime duration every chunk 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

Information about a specific heap region in the G1 GC

Configuration	enabled	period
default	false	everyChunk
profiling	false	everyChunk

Field	Type	Description
index	uint	Index
type	G1HeapRegionType	Type Consider contributing a description to jfreventcollector.
start	ulong: address	Start
used	ulong: bytes	Used

Examples 1

G1GC

index	uint	2
start	ulong: address	30068965376
startTime	long: millis	12822301709
type	G1HeapRegionType	Old
used	ulong: bytes	2097152

ZAllocationStall

default profiling startTime duration eventThread 15 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: ZGC

Missing in: G1GC, ParallelGC, SerialGC, ShenandoahGC

Time spent waiting for memory to become available

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
type	ZPageTypeType	Type Consider contributing a description to jfreventcollector.
size	ulong: bytes	Size

Examples 1

size	ulong: bytes	2097152
startTime	long: millis	25092363416
type	ZPageTypeType	Small

ZPageAllocation

default profiling startTime duration eventThread stackTrace 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: ZGC

Missing in: G1GC, ParallelGC, SerialGC, ShenandoahGC

Allocation of a ZPage

Configuration	enabled	stackTrace	threshold
default	true	true 15+	1 ms
profiling	true	true 15+	1 ms

Field	Type	Description
type	ZPageTypeType 15+	Type Consider contributing a description to jfreventcollector.
size	ulong: bytes 15+	Size
flushed	ulong: bytes 15+	Flushed
committed	ulong: bytes 15+	Committed
segments	uint 15+	Segments
nonBlocking	boolean	Non-blocking

Examples 1

committed	ulong: bytes	2097152
flushed	ulong: bytes	0
nonBlocking	boolean	true
segments	uint	1
size	ulong: bytes	2097152
stackTrace	StackTrace	null
startTime	long: millis	2109292125
type	ZPageTypeType	Small

ZRelocationSet

default profiling startTime duration eventThread 15 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: ZGC

Missing in: G1GC, ParallelGC, SerialGC, ShenandoahGC

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
total	ulong: bytes	Total
empty	ulong: bytes	Empty
relocate	ulong: bytes 16+	Relocate

Examples 1

empty	ulong: bytes	33554432
relocate	ulong: bytes	3258344
startTime	long: millis	1285919416
total	ulong: bytes	216006656

ZRelocationSetGroup

default profiling startTime duration eventThread 15 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: ZGC

Missing in: G1GC, ParallelGC, SerialGC, ShenandoahGC

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
type	ZPageTypeType	Type Consider contributing a description to jfreventcollector.
candidatePages	ulong 21+	Candidate Pages
total	ulong: bytes	Total
empty	ulong: bytes	Empty
selectedPages	ulong 21+	Selected Pages
relocate	ulong: bytes 16+	Relocate

Examples 1

candidatePages	ulong	1
empty	ulong: bytes	0
relocate	ulong: bytes	0
selectedPages	ulong	0
startTime	long: millis	31266462666
total	ulong: bytes	33554432
type	ZPageTypeType	Medium

ZStatisticsCounter

experimental startTime duration eventThread 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: ZGC

Missing in: G1GC, ParallelGC, SerialGC, ShenandoahGC

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	threshold
default	false	0 ms
profiling	false	0 ms

Field	Type	Description
id	ZStatisticsCounterType	Id Consider contributing a description to jfreventcollector.
increment	ulong	Increment
value	ulong	Value

Examples 1

id	ZStatisticsCounterType	Page Cache Hit L1
increment	ulong	1
startTime	long: millis	1153391250
value	ulong	16

ZStatisticsSampler

experimental startTime duration eventThread 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: ZGC

Missing in: G1GC, ParallelGC, SerialGC, ShenandoahGC

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	threshold
default	false	0 ms
profiling	false	0 ms

Field	Type	Description
id	ZStatisticsSamplerType	Id Consider contributing a description to jfreventcollector.
value	ulong	Value

Examples 1

id	ZStatisticsSamplerType	Concurrent Weak Roots OopStorageSet
startTime	long: millis	751975833
value	ulong	119625

ZThreadPhase

experimental startTime duration eventThread 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: ZGC

Missing in: G1GC, ParallelGC, SerialGC, ShenandoahGC

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	threshold
default	false	0 ms
profiling	false	0 ms

Field	Type	Description
gcId	uint	GC Identifier
name	string	Name

Examples 1

gcId	uint	4
name	string	Concurrent Mark Try Flush
startTime	long: millis	2023897458

ZUncommit

default profiling startTime duration eventThread 15 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Uncommitting of memory

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
uncommitted	ulong: bytes	Uncommitted

ZUnmap

default profiling startTime duration eventThread 15 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: ZGC

Missing in: G1GC, ParallelGC, SerialGC, ShenandoahGC

Unmapping of memory

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
unmapped	ulong: bytes	Unmapped

Examples 1

startTime	long: millis	17684273250
unmapped	ulong: bytes	2097152

ShenandoahHeapRegionStateChange

startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: ShenandoahGC

Missing in: G1GC, ParallelGC, SerialGC, ZGC

Information about a Shenandoah heap region state change

Configuration	enabled
default	false
profiling	false

Field	Type	Description
index	uint	Index
from	ShenandoahHeapRegionState	From Consider contributing a description to jfreventcollector.
to	ShenandoahHeapRegionState	To Consider contributing a description to jfreventcollector.
start	ulong: address	Start
used	ulong: bytes	Used

Examples 1

ShenandoahGC

from	ShenandoahHeapRegionState	Empty Uncommitted
index	uint	2018
start	ulong: address	34296823808
startTime	long: millis	1294685042
to	ShenandoahHeapRegionState	Regular
used	ulong: bytes	0

ShenandoahHeapRegionInformation

startTime duration every chunk 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: ShenandoahGC

Missing in: G1GC, ParallelGC, SerialGC, ZGC

Information about a specific heap region in the Shenandoah GC

Configuration	enabled	period
default	false	everyChunk
profiling	false	everyChunk

Field	Type	Description
index	uint	Index
state	ShenandoahHeapRegionState	State Consider contributing a description to jfreventcollector.
start	ulong: address	Start
used	ulong: bytes	Used

Examples 1

ShenandoahGC

index	uint	35
start	ulong: address	30138171392
startTime	long: millis	363234792
state	ShenandoahHeapRegionState	Empty Committed
used	ulong: bytes	0

GCLocker

default profiling startTime eventThread stackTrace 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	stackTrace	threshold
default	true	true	1 s
profiling	true	true	100 ms

Field	Type	Description
lockCount	uint	Lock Count The number of Java threads in a critical section when the GC locker is started
stallCount	uint	Stall Count The number of Java threads stalled by the GC locker

JVM: GC: Heap

GCHeapSummary

default profiling startTime 11 17 21 23 24 graal vm

Category: Java Virtual Machine / GC / Heap

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
gcId	uint	GC Identifier
when	GCWhen	When Consider contributing a description to jfreventcollector.
heapSpace	VirtualSpace struct	Heap Space Consider contributing a description to jfreventcollector.
heapUsed	ulong: bytes	Heap Used Bytes allocated by objects in the heap

Examples 3

gcId	uint	24
heapSpace	VirtualSpace
committedEnd	ulong: address	31690588160
committedSize	ulong: bytes	1625817088
reservedEnd	ulong: address	34359738368
reservedSize	ulong: bytes	4294967296
start	ulong: address	30064771072
heapUsed	ulong: bytes	1518032144
startTime	long: millis	12670354750
when	GCWhen	Before GC

gcId	uint	16
heapSpace	VirtualSpace
committedEnd	ulong: address	30324359168
committedSize	ulong: bytes	259588096
reservedEnd	ulong: address	34359738368
reservedSize	ulong: bytes	4294967296
start	ulong: address	30064771072
heapUsed	ulong: bytes	164613568
startTime	long: millis	1771870000
when	GCWhen	Before GC

gcId	uint	31
heapSpace	VirtualSpace
committedEnd	ulong: address	30379343872
committedSize	ulong: bytes	314572800
reservedEnd	ulong: address	34359738368
reservedSize	ulong: bytes	4294967296
start	ulong: address	30064771072
heapUsed	ulong: bytes	260198256
startTime	long: millis	8479161459
when	GCWhen	Before GC

MetaspaceSummary

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Heap

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
gcId	uint	GC Identifier
when	GCWhen	When Consider contributing a description to jfreventcollector.
gcThreshold	ulong: bytes	GC Threshold
metaspace	MetaspaceSizes struct	Total Consider contributing a description to jfreventcollector.
dataSpace	MetaspaceSizes struct	Data Consider contributing a description to jfreventcollector.
classSpace	MetaspaceSizes struct	Class Consider contributing a description to jfreventcollector.

Examples 3

classSpace	MetaspaceSizes
committed	ulong: bytes	4325376
reserved	ulong: bytes	1073741824
used	ulong: bytes	4175480
dataSpace	MetaspaceSizes
committed	ulong: bytes	32440320
reserved	ulong: bytes	67108864
used	ulong: bytes	32240472
gcId	uint	31
gcThreshold	ulong: bytes	50593792
metaspace	MetaspaceSizes
committed	ulong: bytes	36765696
reserved	ulong: bytes	1140850688
used	ulong: bytes	36415952
startTime	long: millis	8502123667
when	GCWhen	After GC

classSpace	MetaspaceSizes
committed	ulong: bytes	4980736
reserved	ulong: bytes	1073741824
used	ulong: bytes	4797944
dataSpace	MetaspaceSizes
committed	ulong: bytes	36306944
reserved	ulong: bytes	67108864
used	ulong: bytes	36023096
gcId	uint	38
gcThreshold	ulong: bytes	68812800
metaspace	MetaspaceSizes
committed	ulong: bytes	41287680
reserved	ulong: bytes	1140850688
used	ulong: bytes	40821040
startTime	long: millis	23060999125
when	GCWhen	After GC

classSpace	MetaspaceSizes
committed	ulong: bytes	2621440
reserved	ulong: bytes	1073741824
used	ulong: bytes	2506856
dataSpace	MetaspaceSizes
committed	ulong: bytes	21102592
reserved	ulong: bytes	67108864
used	ulong: bytes	20962936
gcId	uint	17
gcThreshold	ulong: bytes	38338560
metaspace	MetaspaceSizes
committed	ulong: bytes	23724032
reserved	ulong: bytes	1140850688
used	ulong: bytes	23469792
startTime	long: millis	1795049917
when	GCWhen	After GC

PSHeapSummary

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Heap

Appearing in: ParallelGC

Missing in: G1GC, SerialGC, ShenandoahGC, ZGC

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
gcId	uint	GC Identifier
when	GCWhen	When Consider contributing a description to jfreventcollector.
oldSpace	VirtualSpace struct	Old Space Consider contributing a description to jfreventcollector.
oldObjectSpace	ObjectSpace struct	Old Object Space Consider contributing a description to jfreventcollector.
youngSpace	VirtualSpace struct	Young Space Consider contributing a description to jfreventcollector.
edenSpace	ObjectSpace struct	Eden Space Consider contributing a description to jfreventcollector.
fromSpace	ObjectSpace struct	From Space Consider contributing a description to jfreventcollector.
toSpace	ObjectSpace struct	To Space Consider contributing a description to jfreventcollector.

Examples 1

ParallelGC

edenSpace	ObjectSpace
end	ulong: address	32995540992
size	ulong: bytes	67108864
start	ulong: address	32928432128
used	ulong: bytes	29700368
fromSpace	ObjectSpace
end	ulong: address	33017561088
size	ulong: bytes	11010048
start	ulong: address	33006551040
used	ulong: bytes	0
gcId	uint	0
oldObjectSpace	ObjectSpace
end	ulong: address	30244077568
size	ulong: bytes	179306496
start	ulong: address	30064771072
used	ulong: bytes	0
oldSpace	VirtualSpace
committedEnd	ulong: address	30244077568
committedSize	ulong: bytes	179306496
reservedEnd	ulong: address	32928432128
reservedSize	ulong: bytes	2863661056
start	ulong: address	30064771072
startTime	long: millis	424087792
toSpace	ObjectSpace
end	ulong: address	33006551040
size	ulong: bytes	11010048
start	ulong: address	32995540992
used	ulong: bytes	0
when	GCWhen	Before GC
youngSpace	VirtualSpace
committedEnd	ulong: address	33017561088
committedSize	ulong: bytes	89128960
reservedEnd	ulong: address	34359738368
reservedSize	ulong: bytes	1431306240
start	ulong: address	32928432128

G1HeapSummary

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Heap

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
gcId	uint	GC Identifier
when	GCWhen	When Consider contributing a description to jfreventcollector.
edenUsedSize	ulong: bytes	Eden Used Size
edenTotalSize	ulong: bytes	Eden Total Size
survivorUsedSize	ulong: bytes	Survivor Used Size
oldGenUsedSize	ulong: bytes 21+	Old Generation Used Size
numberOfRegions	uint	Number of Regions

Examples 1

G1GC

edenTotalSize	ulong: bytes	826277888
edenUsedSize	ulong: bytes	826277888
gcId	uint	40
numberOfRegions	uint	833
oldGenUsedSize	ulong: bytes	352252944
startTime	long: millis	10698219125
survivorUsedSize	ulong: bytes	44040192
when	GCWhen	Before GC

JVM: GC: Metaspace

MetaspaceGCThreshold

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Metaspace

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
oldValue	ulong: bytes	Old Value
newValue	ulong: bytes	New Value
updater	GCThresholdUpdater	Updater Consider contributing a description to jfreventcollector.

Examples 3

newValue	ulong: bytes	38469632
oldValue	ulong: bytes	37027840
startTime	long: millis	2026034084
updater	GCThresholdUpdater	compute_new_size

newValue	ulong: bytes	38338560
oldValue	ulong: bytes	36700160
startTime	long: millis	1497583958
updater	GCThresholdUpdater	compute_new_size

newValue	ulong: bytes	197197824
oldValue	ulong: bytes	151519232
startTime	long: millis	84385085292
updater	GCThresholdUpdater	compute_new_size

MetaspaceAllocationFailure

default profiling startTime stackTrace 11 17 21 23 24

Category: Java Virtual Machine / GC / Metaspace

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	stackTrace
default	true	true
profiling	true	true

Field	Type	Description
classLoader	ClassLoader	Class Loader Consider contributing a description to jfreventcollector.
hiddenClassLoader	boolean 15+	Hidden Class Loader
size	ulong: bytes	Size
metadataType	MetadataType	Metadata Type Consider contributing a description to jfreventcollector.
metaspaceObjectType	MetaspaceObjectType	Metaspace Object Type Consider contributing a description to jfreventcollector.

Examples 3

classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hiddenClassLoader	boolean	false
metadataType	MetadataType	Metadata
metaspaceObjectType	MetaspaceObjectType	ConstantPool
size	ulong: bytes	2440
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	(Ljava/lang/ClassLoader;Ljava/lang/String;[BIILjava/security/ProtectionDomain;Ljava/lang/String;)Ljava/lang/Class;
hidden	boolean	false
modifiers	int	264
name	string	defineClass1
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	1057
name	string	java/lang/ClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	967526042

classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hiddenClassLoader	boolean	false
metadataType	MetadataType	Metadata
metaspaceObjectType	MetaspaceObjectType	ConstMethod
size	ulong: bytes	104
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	(Ljava/lang/ClassLoader;Ljava/lang/String;[BIILjava/security/ProtectionDomain;Ljava/lang/String;)Ljava/lang/Class;
hidden	boolean	false
modifiers	int	264
name	string	defineClass1
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	1057
name	string	java/lang/ClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	1430932917

classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hiddenClassLoader	boolean	false
metadataType	MetadataType	Metadata
metaspaceObjectType	MetaspaceObjectType	Method
size	ulong: bytes	88
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	(Ljava/lang/ClassLoader;Ljava/lang/String;[BIILjava/security/ProtectionDomain;Ljava/lang/String;)Ljava/lang/Class;
hidden	boolean	false
modifiers	int	264
name	string	defineClass1
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	1057
name	string	java/lang/ClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	858453667

MetaspaceOOM

default profiling startTime stackTrace 11 17 21 23 24

Category: Java Virtual Machine / GC / Metaspace

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	stackTrace
default	true	true
profiling	true	true

Field	Type	Description
classLoader	ClassLoader	Class Loader Consider contributing a description to jfreventcollector.
hiddenClassLoader	boolean 15+	Hidden Class Loader
size	ulong: bytes	Size
metadataType	MetadataType	Metadata Type Consider contributing a description to jfreventcollector.
metaspaceObjectType	MetaspaceObjectType	Metaspace Object Type Consider contributing a description to jfreventcollector.

MetaspaceChunkFreeListSummary

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Metaspace

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
gcId	uint	GC Identifier
when	GCWhen	When Consider contributing a description to jfreventcollector.
metadataType	MetadataType	Metadata Type Consider contributing a description to jfreventcollector.
specializedChunks	ulong	Specialized Chunks
specializedChunksTotalSize	ulong: bytes	Specialized Chunks Total Size
smallChunks	ulong	Small Chunks
smallChunksTotalSize	ulong: bytes	Small Chunks Total Size
mediumChunks	ulong	Medium Chunks
mediumChunksTotalSize	ulong: bytes	Medium Chunks Total Size
humongousChunks	ulong	Humongous Chunks
humongousChunksTotalSize	ulong: bytes	Humongous Chunks Total Size

Examples 3

gcId	uint	24
humongousChunks	ulong	0
humongousChunksTotalSize	ulong: bytes	0
mediumChunks	ulong	0
mediumChunksTotalSize	ulong: bytes	0
metadataType	MetadataType	Class
smallChunks	ulong	0
smallChunksTotalSize	ulong: bytes	0
specializedChunks	ulong	0
specializedChunksTotalSize	ulong: bytes	0
startTime	long: millis	13402976333
when	GCWhen	After GC

gcId	uint	3
humongousChunks	ulong	0
humongousChunksTotalSize	ulong: bytes	0
mediumChunks	ulong	0
mediumChunksTotalSize	ulong: bytes	0
metadataType	MetadataType	Metadata
smallChunks	ulong	0
smallChunksTotalSize	ulong: bytes	0
specializedChunks	ulong	0
specializedChunksTotalSize	ulong: bytes	0
startTime	long: millis	939347750
when	GCWhen	Before GC

gcId	uint	4
humongousChunks	ulong	0
humongousChunksTotalSize	ulong: bytes	0
mediumChunks	ulong	0
mediumChunksTotalSize	ulong: bytes	0
metadataType	MetadataType	Class
smallChunks	ulong	0
smallChunksTotalSize	ulong: bytes	0
specializedChunks	ulong	0
specializedChunksTotalSize	ulong: bytes	0
startTime	long: millis	1128461167
when	GCWhen	Before GC

JVM: GC: Phases

GCPhasePause

default profiling startTime duration eventThread 11 17 21 23 24 graal vm

Category: Java Virtual Machine / GC / Phases

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
gcId	uint	GC Identifier
name	string	Name

Examples 3

gcId	uint	91
name	string	GC Pause
startTime	long: millis	31957969042

gcId	uint	95
name	string	GC Pause
startTime	long: millis	15865085250

gcId	uint	81
name	string	GC Pause
startTime	long: millis	60967122208

GCPhasePauseLevel1

default profiling startTime duration eventThread 11 17 21 23 24 graal vm

Category: Java Virtual Machine / GC / Phases

Appearing in: G1GC, ParallelGC, SerialGC, ShenandoahGC

Missing in: ZGC

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
gcId	uint	GC Identifier
name	string	Name

Examples 3

gcId	uint	25
name	string	Weak Processing
startTime	long: millis	14974300417

gcId	uint	18
name	string	Notify PhantomReferences
startTime	long: millis	1807676333

gcId	uint	20
name	string	Notify and keep alive finalizable
startTime	long: millis	2610685542

GCPhasePauseLevel2

default profiling startTime duration eventThread 11 17 21 23 24 graal vm

Category: Java Virtual Machine / GC / Phases

Appearing in: G1GC, ParallelGC, SerialGC

Missing in: ShenandoahGC, ZGC

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
gcId	uint	GC Identifier
name	string	Name

Examples 3

gcId	uint	20
name	string	Report Object Count
startTime	long: millis	6834820208

gcId	uint	81
name	string	Phase 1: Weak Processing
startTime	long: millis	26939212084

gcId	uint	218
name	string	Class Unloading
startTime	long: millis	40108626125

GCPhasePauseLevel3

startTime duration eventThread 11 17 21 23 24 graal vm

Category: Java Virtual Machine / GC / Phases

Appearing in: G1GC, ParallelGC, SerialGC

Missing in: ShenandoahGC, ZGC

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	threshold
default	false	0 ms
profiling	false	0 ms

Field	Type	Description
gcId	uint	GC Identifier
name	string	Name

Examples 3

gcId	uint	95
name	string	Trigger cleanups
startTime	long: millis	16230615042

gcId	uint	71
name	string	ClassLoaderData
startTime	long: millis	54598580333

gcId	uint	80
name	string	Trigger cleanups
startTime	long: millis	26297673917

GCPhasePauseLevel4

startTime duration eventThread 11 17 21 23 24 graal vm

Category: Java Virtual Machine / GC / Phases

Appearing in: G1GC, ParallelGC

Missing in: SerialGC, ShenandoahGC, ZGC

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	threshold
default	false	0 ms
profiling	false	0 ms

Field	Type	Description
gcId	uint	GC Identifier
name	string	Name

Examples 2

ParallelGC
G1GC

gcId	uint	80
name	string	Balance queues
startTime	long: millis	60543917042

gcId	uint	203
name	string	Balance queues
startTime	long: millis	58666037625

GCPhaseConcurrent

default profiling startTime duration eventThread 11 17 21 23 24

Category: Java Virtual Machine / GC / Phases

Appearing in: G1GC, ShenandoahGC, ZGC

Missing in: ParallelGC, SerialGC

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
gcId	uint	GC Identifier
name	string	Name

Examples 3

gcId	uint	3
name	string	Concurrent Relocate
startTime	long: millis	1286847250

gcId	uint	0
name	string	Concurrent Update Refs
startTime	long: millis	813594667

gcId	uint	130
name	string	Concurrent Preclean
startTime	long: millis	46108916959

GCPhaseConcurrentLevel1

default profiling startTime duration eventThread 15 17 21 23 24

Category: Java Virtual Machine / GC / Phases

Appearing in: G1GC, ShenandoahGC, ZGC

Missing in: ParallelGC, SerialGC

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
gcId	uint	GC Identifier
name	string	Name

Examples 3

gcId	uint	38
name	string	ClassLoaderData
startTime	long: millis	44872972083

gcId	uint	3
name	string	ClassLoaderData
startTime	long: millis	4565361625

gcId	uint	193
name	string	Preclean SoftReferences
startTime	long: millis	55412786542

GCPhaseConcurrentLevel2

default profiling startTime duration eventThread 21 23 24

Category: Java Virtual Machine / GC / Phases

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
gcId	uint	GC Identifier
name	string	Name

GCPhaseParallel

default profiling startTime duration eventThread 12 17 21 23 24

Category: Java Virtual Machine / GC / Phases

Appearing in: G1GC, ShenandoahGC

Missing in: ParallelGC, SerialGC, ZGC

GC phases for parallel workers

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
gcId	uint	GC Identifier
gcWorkerId	uint	GC Worker Identifier
name	string	Name

Examples 2

G1GC
ShenandoahGC

gcId	uint	6
gcWorkerId	uint	0
name	string	ResizeTLABs
startTime	long: millis	1433277167

gcId	uint	4
gcWorkerId	uint	1
name	string	Concurrent Reset
startTime	long: millis	5808189958

JVM: GC: Reference

GCReferenceStatistics

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Reference

Total count of processed references during GC

Configuration	enabled
default	true
profiling	true

Field	Type	Description
gcId	uint	GC Identifier
type	ReferenceType	Type Consider contributing a description to jfreventcollector.
count	ulong	Total Count

Examples 3

count	ulong	11
gcId	uint	3
startTime	long: millis	973176333
type	ReferenceType	Phantom reference

count	ulong	0
gcId	uint	25
startTime	long: millis	1902116417
type	ReferenceType	Phantom reference

count	ulong	97
gcId	uint	16
startTime	long: millis	2192124250
type	ReferenceType	Phantom reference

JVM: Heap

GCHeapMemoryUsage

default profiling startTime every chunk 21 23 24

Category: Java Virtual Machine / Heap

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	everyChunk
profiling	true	everyChunk

Field	Type	Description
used	ulong: bytes	Heap Used Bytes allocated for storing objects on the heap
committed	ulong: bytes	Heap Committed Bytes committed for storing objects on the heap
max	ulong: bytes	Heap Max Max size for the heap

Examples 3

committed	ulong: bytes	471728128
max	ulong: bytes	4151836672
startTime	long: millis	88121800750
used	ulong: bytes	145375288

committed	ulong: bytes	754974720
max	ulong: bytes	4294967296
startTime	long: millis	50813634042
used	ulong: bytes	560042008

committed	ulong: bytes	1832386560
max	ulong: bytes	3817865216
startTime	long: millis	94068200250
used	ulong: bytes	241085680

GCHeapMemoryPoolUsage

default profiling startTime every chunk 21 23 24

Category: Java Virtual Machine / Heap

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	everyChunk
profiling	true	everyChunk

Field	Type	Description
name	string	Name GC Heap Memory Pool Name
used	ulong: bytes	GC Heap Memory Pool Used Bytes used for storing objects in this memory pool
committed	ulong: bytes	GC Heap Memory Pool Committed Bytes committed for storing objects in this memory pool
max	ulong: bytes	GC Heap Memory Pool Max Max size for storing objects in this memory pool

Examples 3

committed	ulong: bytes	1076887552
max	ulong: bytes	1374683136
name	string	PS Eden Space
startTime	long: millis	93733044625
used	ulong: bytes	30844072

committed	ulong: bytes	379584512
max	ulong: bytes	-1
name	string	G1 Eden Space
startTime	long: millis	22148504542
used	ulong: bytes	50331648

committed	ulong: bytes	71630848
max	ulong: bytes	1145372672
name	string	Eden Space
startTime	long: millis	364107708
used	ulong: bytes	30273984

JVM: Internal

Duration

internal startTime duration eventThread 18 21 23 24

Category: Java Virtual Machine / Internal

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Instant

internal startTime eventThread 18 21 23 24

Category: Java Virtual Machine / Internal

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Value

internal startTime eventThread 18 21 23 24

Category: Java Virtual Machine / Internal

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Field	Type	Description
value	ulong	Value

Text

internal startTime eventThread 18 21 23 24

Category: Java Virtual Machine / Internal

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Field	Type	Description
text	string	Text

JVM: Memory

ResidentSetSize

default profiling startTime duration every chunk 21 23 24

Category: Java Virtual Machine / Memory

Resident set size of the process

Configuration	enabled	period
default	true	1000 ms
profiling	true	1000 ms

Field	Type	Description
size	ulong: bytes	Resident Set Size Resident set size of the process
peak	ulong: bytes	Resident Set Size Peak Value Resident set size peak value of the process

Examples 3

peak	ulong: bytes	2008924160
size	ulong: bytes	1210957824
startTime	long: millis	79065150167

peak	ulong: bytes	936050688
size	ulong: bytes	677101568
startTime	long: millis	51343849625

peak	ulong: bytes	2339307520
size	ulong: bytes	1135624192
startTime	long: millis	41764410084

NativeMemoryUsage

default profiling startTime duration every chunk 20 21 23 24

Category: Java Virtual Machine / Memory

Native memory usage for a given memory type in the JVM

Configuration	enabled	period
default	true	1000 ms
profiling	true	1000 ms

Field	Type	Description
type	NMTType	Memory Type Type used for the native memory allocation
reserved	ulong: bytes	Reserved Memory Reserved bytes for this type
committed	ulong: bytes	Committed Memory Committed bytes for this type

NativeMemoryUsageTotal

default profiling startTime duration every chunk 20 21 23 24

Category: Java Virtual Machine / Memory

Total native memory usage for the JVM. Might not be the exact sum of the NativeMemoryUsage events due to timeing.

Configuration	enabled	period
default	true	1000 ms
profiling	true	1000 ms

Field	Type	Description
reserved	ulong: bytes	Reserved Memory Total amount of reserved bytes for the JVM
committed	ulong: bytes	Committed Memory Total amount of committed bytes for the JVM

JVM: Profiling

OldObjectSample

cutoff default profiling startTime eventThread stackTrace 11 17 21 23 24

Category: Java Virtual Machine / Profiling

A potential memory leak

Configuration	cutoff	enabled	stackTrace
default	0 ns	true	false
profiling	0 ns	true	true

Field	Type	Description
allocationTime	Ticks	Allocation Time Consider contributing a description to jfreventcollector.
objectSize	ulong: bytes 18+	Object Size
objectAge	Tickspan 14+	Object Age Consider contributing a description to jfreventcollector.
lastKnownHeapUsage	ulong: bytes	Last Known Heap Usage
object	OldObject	Object Consider contributing a description to jfreventcollector.
arrayElements	int	Array Elements If the object is an array, the number of elements, or minimum value for the type int if it is not an array
root	OldObjectGcRoot	GC Root Consider contributing a description to jfreventcollector.

Examples 3

allocationTime	Ticks	87097143125
arrayElements	int	64
lastKnownHeapUsage	ulong: bytes	124397272
object	OldObject
address	ulong: address	31611118368
description	string	null
referrer	Reference	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	0
name	string	[Ljava/util/concurrent/ForkJoinTask;
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util/concurrent
objectAge	Tickspan	11870854583
objectSize	ulong: bytes	272
root	OldObjectGcRoot	null
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	32
lineNumber	int	1607
method	Method
descriptor	string	(Ljava/util/concurrent/ForkJoinPool$WorkQueue;)V
hidden	boolean	false
modifiers	int	16
name	string	registerWorker
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/util/concurrent/ForkJoinPool
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util/concurrent
type	FrameType	Interpreted
truncated	boolean	false
startTime	long: millis	98967997708

allocationTime	Ticks	78193820333
arrayElements	int	46
lastKnownHeapUsage	ulong: bytes	121406312
object	OldObject
address	ulong: address	30176071064
description	string	null
referrer	Reference	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	0
name	string	[B
package	Package	null
objectAge	Tickspan	15873089917
objectSize	ulong: bytes	64
root	OldObjectGcRoot	null
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	()Ljava/lang/String;
hidden	boolean	false
modifiers	int	258
name	string	initClassName
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/lang/Class
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	94066910250

allocationTime	Ticks	36234614500
arrayElements	int	-2147483648
lastKnownHeapUsage	ulong: bytes	97734208
object	OldObject
address	ulong: address	30145655088
description	string	null
referrer	Reference	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	48
name	string	java/util/concurrent/SynchronousQueue$TransferStack$SNode
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util/concurrent
objectAge	Tickspan	41765910709
objectSize	ulong: bytes	32
root	OldObjectGcRoot	null
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	4
lineNumber	int	328
method	Method
descriptor	string	(Ljava/util/concurrent/SynchronousQueue$TransferStack$SNode;Ljava/lang/Object;Ljava/util/concurrent/SynchronousQueue$TransferStack$SNode;I)Ljava/util/concurrent/SynchronousQueue$TransferStack$SNode;
hidden	boolean	false
modifiers	int	8
name	string	snode
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	48
name	string	java/util/concurrent/SynchronousQueue$TransferStack
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util/concurrent
type	FrameType	Inlined
		…
truncated	boolean	false
startTime	long: millis	78000525209

ExecutionSample

default profiling startTime every chunk 11 17 21 23 24 graal vm

Category: Java Virtual Machine / Profiling

Snapshot of a threads state

Configuration	enabled	period
default	true	20 ms
profiling	true	10 ms

Field	Type	Description
sampledThread	Thread	Thread Consider contributing a description to jfreventcollector.
stackTrace	StackTrace	Stack Trace Consider contributing a description to jfreventcollector.
state	ThreadState	Thread State

Examples 3

sampledThread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	main
javaThreadId	long	1
osName	string	main
osThreadId	long	8707
virtual	boolean	false
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	13
lineNumber	int	2569
method	Method
descriptor	string	(II)I
hidden	boolean	false
modifiers	int	1
name	string	lastIndexOf
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/lang/String
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Inlined
		…
truncated	boolean	false
startTime	long: millis	3486126917
state	ThreadState	STATE_RUNNABLE

sampledThread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	main
javaThreadId	long	1
osName	string	main
osThreadId	long	8451
virtual	boolean	false
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	5
lineNumber	int	533
method	Method
descriptor	string	(Ljava/net/URL;)Ljava/net/URL;
hidden	boolean	false
modifiers	int	9
name	string	checkURL
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	jdk/internal/loader/URLClassPath
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	jdk/internal/loader
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	4293444125
state	ThreadState	STATE_RUNNABLE

sampledThread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	main
javaThreadId	long	1
osName	string	main
osThreadId	long	10499
virtual	boolean	false
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	6
lineNumber	int	3482
method	Method
descriptor	string	([Ljava/lang/Object;I)[Ljava/lang/Object;
hidden	boolean	false
modifiers	int	9
name	string	copyOf
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/util/Arrays
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util
type	FrameType	Inlined
		…
truncated	boolean	false
startTime	long: millis	1186241333
state	ThreadState	STATE_RUNNABLE

NativeMethodSample

default profiling startTime every chunk 11 17 21 23 24 graal vm

Category: Java Virtual Machine / Profiling

Snapshot of a threads state when in native

Configuration	enabled	period
default	true	20 ms
profiling	true	20 ms

Field	Type	Description
sampledThread	Thread	Thread Consider contributing a description to jfreventcollector.
stackTrace	StackTrace	Stack Trace Consider contributing a description to jfreventcollector.
state	ThreadState	Thread State

Examples 3

sampledThread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	main
javaThreadId	long	1
osName	string	main
osThreadId	long	8707
virtual	boolean	false
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	(J[BII[BII)J
hidden	boolean	false
modifiers	int	258
name	string	inflateBytesBytes
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/util/zip/Inflater
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util/zip
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	6231930708
state	ThreadState	STATE_RUNNABLE

sampledThread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	main
javaThreadId	long	1
osName	string	main
osThreadId	long	10499
virtual	boolean	false
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	([BII)I
hidden	boolean	false
modifiers	int	258
name	string	readBytes0
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/io/RandomAccessFile
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/io
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	3656278500
state	ThreadState	STATE_RUNNABLE

sampledThread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	main
javaThreadId	long	1
osName	string	main
osThreadId	long	8451
virtual	boolean	false
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	(J[BII[BII)J
hidden	boolean	false
modifiers	int	258
name	string	inflateBytesBytes
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/util/zip/Inflater
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util/zip
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	3183798250
state	ThreadState	STATE_RUNNABLE

JVM: Runtime

ContinuationFreeze

experimental startTime duration eventThread stackTrace 19 21 23 24

Category: Java Virtual Machine / Runtime

Invocation of Continuation.yield()

Configuration	enabled	stackTrace	threshold
default	false	false	0 ms
profiling	false	false	0 ms

Field	Type	Description
carrierThread	Thread	Carrier Thread Thread enlisted as a carrier
continuationClass	Class	Continuation Class Consider contributing a description to jfreventcollector.
interpretedFrames	ushort	Interpreted Frames
size	ushort: bytes	Stack Size

ContinuationThaw

experimental startTime duration eventThread stackTrace 19 21 23 24

Category: Java Virtual Machine / Runtime

Invocation of Continuation.run() on a started continuation

Configuration	enabled	stackTrace	threshold
default	false	false	0 ms
profiling	false	false	0 ms

Field	Type	Description
carrierThread	Thread	Carrier Thread Thread enlisted as a carrier
continuationClass	Class	Continuation Class Consider contributing a description to jfreventcollector.
interpretedFrames	ushort	Interpreted Frames
size	ushort: bytes	Stack Size

ContinuationFreezeFast

experimental startTime eventThread 20 21 23 24

Category: Java Virtual Machine / Runtime

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	false
profiling	false

Field	Type	Description
id	ulong	Continuation ID
size	uint	Size
allocate	boolean	Allocated New

ContinuationFreezeSlow

experimental startTime eventThread 20 21 23 24

Category: Java Virtual Machine / Runtime

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	false
profiling	false

Field	Type	Description
id	ulong	Continuation ID

ContinuationThawFast

experimental startTime eventThread 20 21 23 24

Category: Java Virtual Machine / Runtime

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	false
profiling	false

Field	Type	Description
id	ulong	Continuation ID
full	boolean	Full
size	uint	Size

ContinuationThawSlow

experimental startTime eventThread 20 21 23 24

Category: Java Virtual Machine / Runtime

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	false
profiling	false

Field	Type	Description
id	ulong	Continuation ID

ReservedStackActivation

default profiling startTime eventThread stackTrace 11 17 21 23 24

Category: Java Virtual Machine / Runtime

Activation of Reserved Stack Area caused by stack overflow with ReservedStackAccess annotated method in call stack

Configuration	enabled	stackTrace
default	true	true
profiling	true	true

Field	Type	Description
method	Method	Java Method

SafepointBegin

default profiling startTime duration eventThread 11 17 21 23 24 graal vm

Category: Java Virtual Machine / Runtime / Safepoint

Safepointing begin

Configuration	enabled	threshold
default	true	10 ms
profiling	true	0 ms

Field	Type	Description
safepointId	ulong	Safepoint Identifier
totalThreadCount	int	Total Threads The total number of threads at the start of safe point
jniCriticalThreadCount	int	JNI Critical Threads The number of threads in JNI critical sections

Examples 3

jniCriticalThreadCount	int	0
safepointId	ulong	21
startTime	long: millis	1775223625
totalThreadCount	int	12

jniCriticalThreadCount	int	0
safepointId	ulong	22
startTime	long: millis	1605599792
totalThreadCount	int	20

jniCriticalThreadCount	int	0
safepointId	ulong	15
startTime	long: millis	1199756542
totalThreadCount	int	14

SafepointStateSynchronization

startTime duration eventThread 11 17 21 23 24

Category: Java Virtual Machine / Runtime / Safepoint

Synchronize run state of threads

Configuration	enabled	threshold
default	false	10 ms
profiling	false	0 ms

Field	Type	Description
safepointId	ulong	Safepoint Identifier
initialThreadCount	int	Initial Threads The number of threads running at the beginning of state check
runningThreadCount	int	Running Threads The number of threads still running
iterations	int	Iterations Number of state check iterations

Examples 3

initialThreadCount	int	14
iterations	int	7
runningThreadCount	int	0
safepointId	ulong	49
startTime	long: millis	7233248167

initialThreadCount	int	4
iterations	int	3
runningThreadCount	int	0
safepointId	ulong	99
startTime	long: millis	9500421875

initialThreadCount	int	0
iterations	int	1
runningThreadCount	int	0
safepointId	ulong	11
startTime	long: millis	912107625

SafepointCleanup

startTime duration eventThread 11 17 21 until JDK 23

Category: Java Virtual Machine / Runtime / Safepoint

Safepointing begin running cleanup tasks

Configuration	enabled	threshold
default	false	10 ms
profiling	false	0 ms

Field	Type	Description
safepointId	ulong	Safepoint Identifier

Examples 3

safepointId	ulong	46
startTime	long: millis	1959796875

safepointId	ulong	50
startTime	long: millis	7950860958

safepointId	ulong	36
startTime	long: millis	2468253792

SafepointCleanupTask

startTime duration eventThread 11 17 21 until JDK 23

Category: Java Virtual Machine / Runtime / Safepoint

Safepointing begin running cleanup tasks

Configuration	enabled	threshold
default	false	10 ms
profiling	false	0 ms

Field	Type	Description
safepointId	ulong	Safepoint Identifier
name	string	Task Name The task name

Examples 3

name	string	updating inline caches
safepointId	ulong	18
startTime	long: millis	1601909208

name	string	updating inline caches
safepointId	ulong	30
startTime	long: millis	2064016542

name	string	updating inline caches
safepointId	ulong	25
startTime	long: millis	1561025125

SafepointEnd

startTime duration eventThread 11 17 21 23 24 graal vm

Category: Java Virtual Machine / Runtime / Safepoint

Safepointing end

Configuration	enabled	threshold
default	false	10 ms
profiling	false	0 ms

Field	Type	Description
safepointId	ulong	Safepoint Identifier

Examples 3

safepointId	ulong	37
startTime	long: millis	1852833333

safepointId	ulong	100
startTime	long: millis	17420534542

safepointId	ulong	69
startTime	long: millis	8756442583

ExecuteVMOperation

default profiling startTime duration eventThread 11 17 21 23 24 graal vm

Category: Java Virtual Machine / Runtime

Execution of a VM Operation

Configuration	enabled	threshold
default	true	10 ms
profiling	true	0 ms

Field	Type	Description
operation	VMOperationType	Operation Consider contributing a description to jfreventcollector.
safepoint	boolean	At Safepoint If the operation occurred at a safepoint
blocking	boolean	Caller Blocked If the calling thread was blocked until the operation was complete
caller	Thread	Caller Thread requesting operation. If non-blocking, will be set to 0 indicating thread is unknown
safepointId	ulong	Safepoint Identifier The safepoint (if any) under which this operation was completed

Examples 3

blocking	boolean	true
caller	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	ForkJoinPool-1-worker-2
javaThreadId	long	40
osName	string	ForkJoinPool-1-worker-2
osThreadId	long	42243
virtual	boolean	false
operation	VMOperationType	HandshakeAllThreads
safepoint	boolean	false
safepointId	ulong	0
startTime	long: millis	4621909000

blocking	boolean	true
caller	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.default-dispatcher-18
javaThreadId	long	73
osName	string	UCT-akka.actor.default-dispatcher-18
osThreadId	long	61955
virtual	boolean	false
operation	VMOperationType	ICBufferFull
safepoint	boolean	true
safepointId	ulong	60
startTime	long: millis	8106189959

blocking	boolean	true
caller	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	main
javaThreadId	long	1
osName	string	main
osThreadId	long	8707
virtual	boolean	false
operation	VMOperationType	HandshakeAllThreads
safepoint	boolean	false
safepointId	ulong	0
startTime	long: millis	701652417

Shutdown

default profiling startTime eventThread stackTrace 11 17 21 23 24

Category: Java Virtual Machine / Runtime

JVM shutting down

Configuration	enabled	stackTrace
default	true	true
profiling	true	true

Field	Type	Description
reason	string	Reason Reason for JVM shutdown

Examples 3

reason	string	Shutdown requested from Java
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	()V
hidden	boolean	false
modifiers	int	264
name	string	beforeHalt
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	java/lang/Shutdown
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	94066455250

reason	string	Shutdown requested from Java
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	()V
hidden	boolean	false
modifiers	int	264
name	string	beforeHalt
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	java/lang/Shutdown
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	77999546542

reason	string	Shutdown requested from Java
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	()V
hidden	boolean	false
modifiers	int	264
name	string	beforeHalt
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	java/lang/Shutdown
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	98967385458

SymbolTableStatistics

default profiling startTime duration every chunk 13 17 21 23 24

Category: Java Virtual Machine / Runtime / Tables

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	10 s
profiling	true	10 s

Field	Type	Description
bucketCount	ulong	Bucket Count Number of buckets
entryCount	ulong	Entry Count Number of all entries
totalFootprint	ulong: bytes	Total Footprint Total memory footprint (the table itself plus all of the entries)
bucketCountMaximum	ulong	Maximum Bucket Count The maximum bucket length (entries in a single bucket)
bucketCountAverage	float	Average Bucket Count The average bucket length
bucketCountVariance	float	Bucket Count Variance How far bucket lengths are spread out from their average value
bucketCountStandardDeviation	float	Bucket Count Standard Deviation How far bucket lengths are spread out from their mean (expected) value
insertionRate	float	Insertion Rate How many items were added since last event (per second)
removalRate	float	Removal Rate How many items were removed since last event (per second)

Examples 3

bucketCount	ulong	32768
bucketCountAverage	float	4.675476
bucketCountMaximum	ulong	18
bucketCountStandardDeviation	float	2.1836393
bucketCountVariance	float	4.7682805
entryCount	ulong	153206
insertionRate	float	1625.4371
removalRate	float	1540.209
startTime	long: millis	63498592000
totalFootprint	ulong: bytes	13193320

bucketCount	ulong	32768
bucketCountAverage	float	2.5411987
bucketCountMaximum	ulong	11
bucketCountStandardDeviation	float	1.6137908
bucketCountVariance	float	2.6043208
entryCount	ulong	83270
insertionRate	float	10.692637
removalRate	float	0.074773684
startTime	long: millis	24977980708
totalFootprint	ulong: bytes	6199544

bucketCount	ulong	32768
bucketCountAverage	float	5.0481567
bucketCountMaximum	ulong	18
bucketCountStandardDeviation	float	2.2677255
bucketCountVariance	float	5.1425786
entryCount	ulong	165418
insertionRate	float	5757.7856
removalRate	float	4662.9834
startTime	long: millis	62133172375
totalFootprint	ulong: bytes	14377008

StringTableStatistics

default profiling startTime duration every chunk 13 17 21 23 24

Category: Java Virtual Machine / Runtime / Tables

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	10 s
profiling	true	10 s

Field	Type	Description
bucketCount	ulong	Bucket Count Number of buckets
entryCount	ulong	Entry Count Number of all entries
totalFootprint	ulong: bytes	Total Footprint Total memory footprint (the table itself plus all of the entries)
bucketCountMaximum	ulong	Maximum Bucket Count The maximum bucket length (entries in a single bucket)
bucketCountAverage	float	Average Bucket Count The average bucket length
bucketCountVariance	float	Bucket Count Variance How far bucket lengths are spread out from their average value
bucketCountStandardDeviation	float	Bucket Count Standard Deviation How far bucket lengths are spread out from their mean (expected) value
insertionRate	float	Insertion Rate How many items were added since last event (per second)
removalRate	float	Removal Rate How many items were removed since last event (per second)

Examples 3

bucketCount	ulong	65536
bucketCountAverage	float	0.34371948
bucketCountMaximum	ulong	6
bucketCountStandardDeviation	float	0.5813279
bucketCountVariance	float	0.33794212
entryCount	ulong	22526
insertionRate	float	1223.0361
removalRate	float	193.10052
startTime	long: millis	32373892667
totalFootprint	ulong: bytes	2499552

bucketCount	ulong	65536
bucketCountAverage	float	0.1854248
bucketCountMaximum	ulong	4
bucketCountStandardDeviation	float	0.43189627
bucketCountVariance	float	0.18653439
entryCount	ulong	12152
insertionRate	float	7.4777584
removalRate	float	0.29911032
startTime	long: millis	24980481750
totalFootprint	ulong: bytes	1487776

bucketCount	ulong	65536
bucketCountAverage	float	0.5464325
bucketCountMaximum	ulong	6
bucketCountStandardDeviation	float	0.7264649
bucketCountVariance	float	0.52775127
entryCount	ulong	35811
insertionRate	float	1141.8413
removalRate	float	140.4388
startTime	long: millis	62136716959
totalFootprint	ulong: bytes	3004792

ThreadDump

default profiling startTime duration every chunk 11 17 21 23 24

Category: Java Virtual Machine / Runtime

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	everyChunk
profiling	true	60 s

Field	Type	Description
result	string	Thread Dump

Examples 3

result	string	2023-12-18 12:47:28 Full thread dump OpenJDK 64-Bit Server VM (21.0.1+12-LTS mixed mode): Threads class SMR info: _java_thread_list=0x000060000092cca0, length=77, elements={ 0x0000000132812000, 0x0000000131017000, 0x0000000131014c00, 0x000000013203b200, 0x0000000132008200, 0x0000000132009600, 0x000…
startTime	long: millis	67214999000

result	string	2023-12-18 13:32:26 Full thread dump OpenJDK 64-Bit Server VM (21.0.1+12-LTS mixed mode): Threads class SMR info: _java_thread_list=0x00006000017c1400, length=143, elements={ 0x000000014200b400, 0x0000000144010800, 0x000000013200aa00, 0x0000000144044800, 0x0000000144041800, 0x0000000142009800, 0x00…
startTime	long: millis	62136723709

result	string	2023-12-18 12:45:49 Full thread dump OpenJDK 64-Bit Server VM (21.0.1+12-LTS mixed mode): Threads class SMR info: _java_thread_list=0x00006000003cd500, length=77, elements={ 0x000000011f00f200, 0x000000010e038800, 0x000000010e03b200, 0x000000011f80ec00, 0x000000011f80c800, 0x000000011f811600, 0x000…
startTime	long: millis	63501309417

NativeLibrary

default profiling startTime every chunk 11 17 21 23 24

Category: Java Virtual Machine / Runtime

Information about a dynamic library or other native image loaded by the JVM process

Configuration	enabled	period
default	true	everyChunk
profiling	true	everyChunk

Field	Type	Description
name	string	Name
baseAddress	ulong: address	Base Address Starting address of the module
topAddress	ulong: address	Top Address Ending address of the module, if available

Examples 3

baseAddress	ulong: address	6710632448
name	string	/System/Library/PrivateFrameworks/CoreAutoLayout.framework/Versions/A/CoreAutoLayout
startTime	long: millis	423214667
topAddress	ulong: address	0

baseAddress	ulong: address	6565646336
name	string	/usr/lib/system/libdispatch.dylib
startTime	long: millis	364596583
topAddress	ulong: address	0

baseAddress	ulong: address	6698287104
name	string	/usr/lib/libDiagnosticMessagesClient.dylib
startTime	long: millis	675848959
topAddress	ulong: address	0

NativeLibraryLoad

default profiling startTime duration eventThread stackTrace 22 23 24

Category: Java Virtual Machine / Runtime

Information about a dynamic library or other native image load operation

Configuration	enabled	stackTrace	threshold
default	true	true	0 ms
profiling	true	true	0 ms

Field	Type	Description
name	string	Name
success	boolean	Success Success or failure of the load operation
errorMessage	string	Error Message In case of a load error, error description

NativeLibraryUnload

default profiling startTime duration eventThread stackTrace 22 23 24

Category: Java Virtual Machine / Runtime

Information about a dynamic library or other native image unload operation

Configuration	enabled	stackTrace	threshold
default	true	true	0 ms
profiling	true	true	0 ms

Field	Type	Description
name	string	Name
success	boolean	Success Success or failure of the unload operation
errorMessage	string	Error Message In case of an unload error, error description

ModuleRequire

default profiling startTime every chunk 11 17 21 23 24

Category: Java Virtual Machine / Runtime / Modules

A directed edge representing a dependency

Configuration	enabled	period
default	true	endChunk
profiling	true	endChunk

Field	Type	Description
source	Module	Source Module
requiredModule	Module	Required Module Consider contributing a description to jfreventcollector.

Examples 3

requiredModule	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.xml
name	string	java.xml
version	string	21.0.1
source	Module
classLoader	ClassLoader
name	string	platform
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	jdk/internal/loader/ClassLoaders$PlatformClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	jdk/internal/loader
location	string	jrt:/java.xml.crypto
name	string	java.xml.crypto
version	string	21.0.1
startTime	long: millis	16763952708

requiredModule	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.desktop
name	string	java.desktop
version	string	21.0.1
source	Module
classLoader	ClassLoader
name	string	platform
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	jdk/internal/loader/ClassLoaders$PlatformClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	jdk/internal/loader
location	string	jrt:/jdk.accessibility
name	string	jdk.accessibility
version	string	21.0.1
startTime	long: millis	14998474333

requiredModule	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.prefs
name	string	java.prefs
version	string	21.0.1
source	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.desktop
name	string	java.desktop
version	string	21.0.1
startTime	long: millis	12401797959

ModuleExport

default profiling startTime every chunk 11 17 21 23 24

Category: Java Virtual Machine / Runtime / Modules

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	endChunk
profiling	true	endChunk

Field	Type	Description
exportedPackage	Package	Exported Package Consider contributing a description to jfreventcollector.
targetModule	Module	Target Module Module to which the package is qualifiedly exported. If null or N/A, the package is unqualifiedly exported

Examples 3

exportedPackage	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	scala/collection/mutable
startTime	long: millis	16764024625
targetModule	Module	null

exportedPackage	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	scala/collection
startTime	long: millis	12401834834
targetModule	Module	null

exportedPackage	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	scala/util
startTime	long: millis	14998523917
targetModule	Module	null

Java Application

ThreadStart

default profiling startTime eventThread stackTrace 11 17 21 23 24 graal vm

Category: Java Application

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	stackTrace
default	true	true
profiling	true	true

Field	Type	Description
thread	Thread	New Java Thread
parentThread	Thread	Parent Java Thread

Examples 3

parentThread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	scala-execution-context-global-44
javaThreadId	long	44
osName	string	scala-execution-context-global-44
osThreadId	long	24335
virtual	boolean	false
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	2
lineNumber	int	2573
method	Method
descriptor	string	(Ljava/lang/Thread;Ljdk/internal/vm/ThreadContainer;)V
hidden	boolean	false
modifiers	int	1
name	string	start
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	java/lang/System$2
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	6794675333
thread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	scala-execution-context-global-49
javaThreadId	long	49
osName	string	scala-execution-context-global-49
osThreadId	long	40707
virtual	boolean	false

parentThread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.default-dispatcher-14
javaThreadId	long	112
osName	string	UCT-akka.actor.default-dispatcher-14
osThreadId	long	86019
virtual	boolean	false
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	2
lineNumber	int	2573
method	Method
descriptor	string	(Ljava/lang/Thread;Ljdk/internal/vm/ThreadContainer;)V
hidden	boolean	false
modifiers	int	1
name	string	start
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	java/lang/System$2
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	10645494292
thread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.default-dispatcher-20
javaThreadId	long	118
osName	string	UCT-akka.actor.default-dispatcher-20
osThreadId	long	83971
virtual	boolean	false

parentThread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	main
javaThreadId	long	1
osName	string	main
osThreadId	long	10499
virtual	boolean	false
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	41
lineNumber	int	129
method	Method
descriptor	string	()Ljava/lang/Void;
hidden	boolean	false
modifiers	int	1
name	string	run
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	java/lang/ref/Finalizer$1
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang/ref
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	1335167958
thread	Thread
group	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	Secondary finalizer
javaThreadId	long	30
osName	string	Secondary finalizer
osThreadId	long	27139
virtual	boolean	false

ThreadEnd

default profiling startTime eventThread 11 17 21 23 24 graal vm

Category: Java Application

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
thread	Thread	Java Thread

Examples 3

startTime	long: millis	13997328584
thread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.default-dispatcher-19
javaThreadId	long	141
osName	string	UCT-akka.actor.default-dispatcher-19
osThreadId	long	34827
virtual	boolean	false

startTime	long: millis	15749496375
thread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.default-dispatcher-6
javaThreadId	long	125
osName	string	UCT-akka.actor.default-dispatcher-6
osThreadId	long	60679
virtual	boolean	false

startTime	long: millis	6180517625
thread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	ForkJoinPool-1-worker-2
javaThreadId	long	32
osName	string	ForkJoinPool-1-worker-2
osThreadId	long	26891
virtual	boolean	false

ThreadPark

default profiling startTime duration eventThread stackTrace 11 17 21 23 24 graal vm

Category: Java Application

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	stackTrace	threshold
default	true	true	20 ms
profiling	true	true	10 ms

Field	Type	Description
parkedClass	Class	Class Parked On
timeout	long: nanos	Park Timeout
until	long: epochmillis	Park Until
address	ulong: address	Address of Object Parked

Examples 3

address	ulong: address	31586136128
parkedClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/util/concurrent/ForkJoinPool
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util/concurrent
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	(ZJ)V
hidden	boolean	false
modifiers	int	257
name	string	park
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	jdk/internal/misc/Unsafe
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	jdk/internal/misc
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	4338983458
timeout	long: nanos	-9223372036854775808
until	long: epochmillis	-9223372036854775808

address	ulong: address	30186510992
parkedClass	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hidden	boolean	false
modifiers	int	49
name	string	scala/concurrent/impl/ExecutionContextImpl$$anon$3
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	scala/concurrent/impl
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	(ZJ)V
hidden	boolean	false
modifiers	int	257
name	string	park
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	jdk/internal/misc/Unsafe
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	jdk/internal/misc
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	8447123667
timeout	long: nanos	-9223372036854775808
until	long: epochmillis	1702902752832

address	ulong: address	30156597904
parkedClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/util/concurrent/ForkJoinPool
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util/concurrent
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	(ZJ)V
hidden	boolean	false
modifiers	int	257
name	string	park
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	jdk/internal/misc/Unsafe
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	jdk/internal/misc
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	4928442542
timeout	long: nanos	-9223372036854775808
until	long: epochmillis	-9223372036854775808

JavaMonitorEnter

default profiling startTime duration eventThread stackTrace 11 17 21 23 24 graal vm

Category: Java Application

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	stackTrace	threshold
default	true	true	20 ms
profiling	true	true	10 ms

Field	Type	Description
monitorClass	Class	Monitor Class Consider contributing a description to jfreventcollector.
previousOwner	Thread	Previous Monitor Owner
address	ulong: address	Monitor Address

Examples 3

address	ulong: address	105553170730032
monitorClass	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hidden	boolean	false
modifiers	int	33
name	string	edu/rice/habanero/actors/AkkaActorState$actorLatch$
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	edu/rice/habanero/actors
previousOwner	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.default-dispatcher-18
javaThreadId	long	62
osName	string	UCT-akka.actor.default-dispatcher-18
osThreadId	long	38659
virtual	boolean	false
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	-1
lineNumber	int	115
method	Method
descriptor	string	()V
hidden	boolean	false
modifiers	int	33
name	string	countUp
type	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hidden	boolean	false
modifiers	int	33
name	string	edu/rice/habanero/actors/AkkaActorState$actorLatch$
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	edu/rice/habanero/actors
type	FrameType	Inlined
		…
truncated	boolean	false
startTime	long: millis	7552838917

address	ulong: address	105553176308912
monitorClass	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hidden	boolean	false
modifiers	int	33
name	string	edu/rice/habanero/actors/AkkaActorState$actorLatch$
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	edu/rice/habanero/actors
previousOwner	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.default-dispatcher-4
javaThreadId	long	50
osName	string	UCT-akka.actor.default-dispatcher-4
osThreadId	long	41223
virtual	boolean	false
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	-1
lineNumber	int	109
method	Method
descriptor	string	()V
hidden	boolean	false
modifiers	int	33
name	string	countDown
type	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hidden	boolean	false
modifiers	int	33
name	string	edu/rice/habanero/actors/AkkaActorState$actorLatch$
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	edu/rice/habanero/actors
type	FrameType	Inlined
		…
truncated	boolean	false
startTime	long: millis	8087531500

address	ulong: address	105553162252064
monitorClass	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hidden	boolean	false
modifiers	int	33
name	string	edu/rice/habanero/actors/AkkaActorState$actorLatch$
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	edu/rice/habanero/actors
previousOwner	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.default-dispatcher-6
javaThreadId	long	56
osName	string	UCT-akka.actor.default-dispatcher-6
osThreadId	long	35843
virtual	boolean	false
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	-1
lineNumber	int	109
method	Method
descriptor	string	()V
hidden	boolean	false
modifiers	int	33
name	string	countDown
type	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hidden	boolean	false
modifiers	int	33
name	string	edu/rice/habanero/actors/AkkaActorState$actorLatch$
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	edu/rice/habanero/actors
type	FrameType	Inlined
		…
truncated	boolean	false
startTime	long: millis	9155132625

JavaMonitorWait

default profiling startTime duration eventThread stackTrace 11 17 21 23 24 graal vm

Category: Java Application

Waiting on a Java monitor

Configuration	enabled	stackTrace	threshold
default	true	true	20 ms
profiling	true	true	10 ms

Field	Type	Description
monitorClass	Class	Monitor Class Class of object waited on
notifier	Thread	Notifier Thread Notifying Thread
timeout	long: millis	Timeout Maximum wait time
timedOut	boolean	Timed Out Wait has been timed out
address	ulong: address	Monitor Address Address of object waited on

Examples 3

address	ulong: address	105553176041360
monitorClass	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hidden	boolean	false
modifiers	int	33
name	string	org/renaissance/twitter/finagle/FinagleHttp$WorkerThread
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	org/renaissance/twitter/finagle
notifier	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	finagle-http-worker-0
javaThreadId	long	305
osName	string	finagle-http-worker-0
osThreadId	long	62999
virtual	boolean	false
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	(J)V
hidden	boolean	false
modifiers	int	274
name	string	wait0
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/Object
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	31539925875
timedOut	boolean	false
timeout	long: millis	0

address	ulong: address	105553170730032
monitorClass	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hidden	boolean	false
modifiers	int	33
name	string	edu/rice/habanero/actors/AkkaActorState$actorLatch$
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	edu/rice/habanero/actors
notifier	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.default-dispatcher-7
javaThreadId	long	162
osName	string	UCT-akka.actor.default-dispatcher-7
osThreadId	long	47115
virtual	boolean	false
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	(J)V
hidden	boolean	false
modifiers	int	274
name	string	wait0
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/Object
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	19909020167
timedOut	boolean	false
timeout	long: millis	0

address	ulong: address	105553363523056
monitorClass	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hidden	boolean	false
modifiers	int	33
name	string	org/renaissance/scala/stm/RealityShowPhilosophers$PhilosopherThread
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	org/renaissance/scala/stm
notifier	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	Thread-34
javaThreadId	long	375
osName	string	Thread-34
osThreadId	long	64279
virtual	boolean	false
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	(J)V
hidden	boolean	false
modifiers	int	274
name	string	wait0
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/Object
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	52772486542
timedOut	boolean	false
timeout	long: millis	0

JavaMonitorInflate

profiling startTime duration eventThread stackTrace 11 17 21 23 24 graal vm

Category: Java Application

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	stackTrace	threshold
default	false	true	20 ms
profiling	true	true	10 ms

Field	Type	Description
monitorClass	Class	Monitor Class Consider contributing a description to jfreventcollector.
address	ulong: address	Monitor Address
cause	InflateCause	Monitor Inflation Cause Cause of inflation

ObjectAllocationInNewTLAB

startTime eventThread stackTrace 11 17 21 23 24 graal vm

Category: Java Application

Allocation in new Thread Local Allocation Buffer

Configuration	enabled	stackTrace
default	false	true
profiling	false	true

Field	Type	Description
objectClass	Class	Object Class Class of allocated object
allocationSize	ulong: bytes	Allocation Size
tlabSize	ulong: bytes	TLAB Size

Examples 3

allocationSize	ulong: bytes	80
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/util/regex/Matcher
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util/regex
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	32
lineNumber	int	1180
method	Method
descriptor	string	(Ljava/lang/CharSequence;)Ljava/util/regex/Matcher;
hidden	boolean	false
modifiers	int	1
name	string	matcher
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/util/regex/Pattern
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util/regex
type	FrameType	JIT compiled
		…
truncated	boolean	false
startTime	long: millis	1032061375
tlabSize	ulong: bytes	1342256

allocationSize	ulong: bytes	24
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	0
name	string	[B
package	Package	null
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	10
lineNumber	int	3863
method	Method
descriptor	string	([BII)[B
hidden	boolean	false
modifiers	int	10
name	string	copyOfRangeByte
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/util/Arrays
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util
type	FrameType	Inlined
		…
truncated	boolean	false
startTime	long: millis	983790125
tlabSize	ulong: bytes	1433944

allocationSize	ulong: bytes	7184
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	0
name	string	[B
package	Package	null
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	15
lineNumber	int	3541
method	Method
descriptor	string	([BI)[B
hidden	boolean	false
modifiers	int	9
name	string	copyOf
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/util/Arrays
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util
type	FrameType	JIT compiled
		…
truncated	boolean	false
startTime	long: millis	929393125
tlabSize	ulong: bytes	83056

ObjectAllocationOutsideTLAB

startTime eventThread stackTrace 11 17 21 23 24

Category: Java Application

Allocation outside Thread Local Allocation Buffers

Configuration	enabled	stackTrace
default	false	true
profiling	false	true

Field	Type	Description
objectClass	Class	Object Class Class of allocated object
allocationSize	ulong: bytes	Allocation Size

Examples 3

allocationSize	ulong: bytes	36464
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	0
name	string	[Ljava/lang/Object;
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	7
lineNumber	int	3513
method	Method
descriptor	string	([Ljava/lang/Object;ILjava/lang/Class;)[Ljava/lang/Object;
hidden	boolean	false
modifiers	int	9
name	string	copyOf
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/util/Arrays
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util
type	FrameType	JIT compiled
		…
truncated	boolean	false
startTime	long: millis	2020580042

allocationSize	ulong: bytes	32
objectClass	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hidden	boolean	false
modifiers	int	49
name	string	akka/actor/ChildRestartStats
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	akka/actor
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	99
lineNumber	int	159
method	Method
descriptor	string	(Lakka/actor/ActorRef;)Lscala/Option;
hidden	boolean	false
modifiers	int	1
name	string	initChild
type	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hidden	boolean	false
modifiers	int	1537
name	string	akka/actor/dungeon/Children
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	akka/actor/dungeon
type	FrameType	Inlined
		…
truncated	boolean	false
startTime	long: millis	19758191167

allocationSize	ulong: bytes	4048
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	0
name	string	[B
package	Package	null
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	15
lineNumber	int	3541
method	Method
descriptor	string	([BI)[B
hidden	boolean	false
modifiers	int	9
name	string	copyOf
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/util/Arrays
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util
type	FrameType	JIT compiled
		…
truncated	boolean	false
startTime	long: millis	937023875

ObjectAllocationSample

throttle default profiling startTime eventThread stackTrace 16 17 21 23 24

Category: Java Application

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	stackTrace	throttle
default	true	true	150/s
profiling	true	true	300/s

Field	Type	Description
objectClass	Class	Object Class Class of allocated object
weight	long: bytes	Sample Weight The relative weight of the sample. Aggregating the weights for a large number of samples, for a particular class, thread or stack trace, gives a statistically accurate representation of the allocation pressure

Examples 3

objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/lang/String
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	7
lineNumber	int	752
method	Method
descriptor	string	([BII)Ljava/lang/String;
hidden	boolean	false
modifiers	int	9
name	string	newString
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	48
name	string	java/lang/StringLatin1
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Inlined
		…
truncated	boolean	false
startTime	long: millis	1033786083
weight	long: bytes	1341232

objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	0
name	string	[B
package	Package	null
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	11
lineNumber	int	928
method	Method
descriptor	string	()J
hidden	boolean	false
modifiers	int	2
name	string	initDataOffset
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	java/util/zip/ZipFile$ZipFileInputStream
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util/zip
type	FrameType	JIT compiled
		…
truncated	boolean	false
startTime	long: millis	596809750
weight	long: bytes	1448248

objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	0
name	string	[Ljava/lang/String;
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	301
lineNumber	int	1442
method	Method
descriptor	string	(Ljava/lang/CharSequence;IZ)[Ljava/lang/String;
hidden	boolean	false
modifiers	int	2
name	string	split
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/util/regex/Pattern
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util/regex
type	FrameType	JIT compiled
		…
truncated	boolean	false
startTime	long: millis	1516668375
weight	long: bytes	1045480

JavaErrorThrow

default profiling startTime duration stackTrace 11 17 21 until JDK 23

Source src/jdk.jfr/share/classes/jdk/jfr/events/ErrorThrownEvent.java

Category: Java Application

An object derived from java.lang.Error has been created. OutOfMemoryErrors are ignored

Configuration	enabled	stackTrace
default	true	true
profiling	true	true

Field	Type	Description
message	string	Message Consider contributing a description to jfreventcollector.
thrownClass	Class	Class Consider contributing a description to jfreventcollector.

Examples 3

message	string	'int java.lang.invoke.DirectMethodHandle$Holder.invokeStatic(java.lang.Object, java.lang.Object, int, int)'
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	7
lineNumber	int	68
method	Method
descriptor	string	(Ljava/lang/String;)V
hidden	boolean	false
modifiers	int	1
name	string	<init>
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/Error
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	6147516375
thrownClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/NoSuchMethodError
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang

message	string	'java.lang.Object java.lang.invoke.DirectMethodHandle$Holder.newInvokeSpecial(java.lang.Object, java.lang.Object, java.lang.Object, int, java.lang.Object)'
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	7
lineNumber	int	68
method	Method
descriptor	string	(Ljava/lang/String;)V
hidden	boolean	false
modifiers	int	1
name	string	<init>
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/Error
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	6992831792
thrownClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/NoSuchMethodError
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang

message	string	'java.lang.Object java.lang.invoke.DirectMethodHandle$Holder.newInvokeSpecial(java.lang.Object, java.lang.Object, int, java.lang.Object)'
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	7
lineNumber	int	68
method	Method
descriptor	string	(Ljava/lang/String;)V
hidden	boolean	false
modifiers	int	1
name	string	<init>
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/Error
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	4036698833
thrownClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/NoSuchMethodError
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang

FileForce

default profiling startTime duration stackTrace 11 17 21 until JDK 23

Source src/jdk.jfr/share/classes/jdk/jfr/events/FileForceEvent.java

Category: Java Application

Force updates to be written to file

Configuration	enabled	stackTrace	threshold
default	true	true	20 ms
profiling	true	true	10 ms

Field	Type	Description
path	string	Path Full path of the file
metaData	boolean	Update Metadata Whether the file metadata is updated

SocketWrite

default profiling startTime duration stackTrace 11 17 21 until JDK 23

Source src/jdk.jfr/share/classes/jdk/jfr/events/SocketWriteEvent.java

Category: Java Application

Writing data to a socket

Configuration	enabled	stackTrace	threshold
default	true	true	20 ms
profiling	true	true	10 ms

Field	Type	Description
host	string	Remote Host
address	string	Remote Address
port	int	Remote Port
bytesWritten	long: bytes	Bytes Written Number of bytes written to the socket

Examples 3

address	string	127.0.0.1
bytesWritten	long: bytes	50
host	string
port	int	52656
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	584
lineNumber	int	191
method	Method
descriptor	string	([Ljava/nio/ByteBuffer;II)J
hidden	boolean	false
modifiers	int	1
name	string	write
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	sun/nio/ch/SocketChannelImpl
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	sun/nio/ch
type	FrameType	JIT compiled
		…
truncated	boolean	true
startTime	long: millis	44698827250

address	string	127.0.0.1
bytesWritten	long: bytes	40
host	string
port	int	56728
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	584
lineNumber	int	191
method	Method
descriptor	string	([Ljava/nio/ByteBuffer;II)J
hidden	boolean	false
modifiers	int	1
name	string	write
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	sun/nio/ch/SocketChannelImpl
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	sun/nio/ch
type	FrameType	JIT compiled
		…
truncated	boolean	false
startTime	long: millis	63487857959

address	string	127.0.0.1
bytesWritten	long: bytes	50
host	string
port	int	52290
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	584
lineNumber	int	191
method	Method
descriptor	string	([Ljava/nio/ByteBuffer;II)J
hidden	boolean	false
modifiers	int	1
name	string	write
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	sun/nio/ch/SocketChannelImpl
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	sun/nio/ch
type	FrameType	JIT compiled
		…
truncated	boolean	true
startTime	long: millis	42446416417

VirtualThreadStart

startTime duration stackTrace 21 until JDK 23

Source src/jdk.jfr/share/classes/jdk/jfr/events/VirtualThreadStartEvent.java

Category: Java Application

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	stackTrace
default	false	true
profiling	false	true

Field	Type	Description
javaThreadId	long	Thread Id

JavaExceptionThrow

startTime duration stackTrace 11 17 21 until JDK 23

Source src/jdk.jfr/share/classes/jdk/jfr/events/ExceptionThrownEvent.java

Category: Java Application

An object derived from java.lang.Exception has been created

Configuration	enabled	stackTrace
default	false	true
profiling	false	true

Field	Type	Description
message	string	Message Consider contributing a description to jfreventcollector.
thrownClass	Class	Class Consider contributing a description to jfreventcollector.

Examples 3

message	string	scala.LowPriorityImplicits2
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	40
lineNumber	int	298
method	Method
descriptor	string	(Ljava/lang/String;Ljava/lang/Throwable;)V
hidden	boolean	false
modifiers	int	1
name	string	<init>
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/Throwable
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	696355583
thrownClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/ClassNotFoundException
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang

message	string	scala.collection.AbstractIterable
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	40
lineNumber	int	298
method	Method
descriptor	string	(Ljava/lang/String;Ljava/lang/Throwable;)V
hidden	boolean	false
modifiers	int	1
name	string	<init>
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/Throwable
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	568750250
thrownClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/ClassNotFoundException
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang

message	string	'java.lang.Object java.lang.invoke.DirectMethodHandle$Holder.invokeVirtual(java.lang.Object, java.lang.Object, java.lang.Object)'
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	35
lineNumber	int	275
method	Method
descriptor	string	(Ljava/lang/String;)V
hidden	boolean	false
modifiers	int	1
name	string	<init>
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/Throwable
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	794203209
thrownClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/NoSuchMethodError
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang

FileWrite

default profiling startTime duration stackTrace 11 17 21 until JDK 23

Source src/jdk.jfr/share/classes/jdk/jfr/events/FileWriteEvent.java

Category: Java Application

Appearing in: G1GC, ParallelGC, ShenandoahGC, ZGC

Missing in: SerialGC

Writing data to a file

Configuration	enabled	stackTrace	threshold
default	true	true	20 ms
profiling	true	true	10 ms

Field	Type	Description
path	string	Path Full path of the file, or N/A if a file descriptor was used to create the stream, for example System.out and System.err
bytesWritten	long: bytes	Bytes Written Number of bytes written to the file

Examples 3

bytesWritten	long: bytes	8672
path	string	harness-133125-7262456833842592188/apache-spark/lib/hadoop-client-runtime-3.3.1.jar
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	678
lineNumber	int	154
method	Method
descriptor	string	(Ljava/nio/ByteBuffer;)I
hidden	boolean	false
modifiers	int	1
name	string	write
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	sun/nio/ch/FileChannelImpl
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	sun/nio/ch
type	FrameType	JIT compiled
		…
truncated	boolean	false
startTime	long: millis	3495218667

bytesWritten	long: bytes	16384
path	string	harness-124802-11372319207631724376/apache-spark/lib/spark-sql_2.13-3.2.0.jar
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	678
lineNumber	int	154
method	Method
descriptor	string	(Ljava/nio/ByteBuffer;)I
hidden	boolean	false
modifiers	int	1
name	string	write
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	sun/nio/ch/FileChannelImpl
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	sun/nio/ch
type	FrameType	JIT compiled
		…
truncated	boolean	false
startTime	long: millis	2721627083

bytesWritten	long: bytes	120
path	string	null
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	171
lineNumber	int	103
method	Method
descriptor	string	([BII)V
hidden	boolean	false
modifiers	int	1
name	string	write
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/io/FileOutputStream
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/io
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	56404662458

VirtualThreadEnd

startTime duration stackTrace 21 until JDK 23

Source src/jdk.jfr/share/classes/jdk/jfr/events/VirtualThreadEndEvent.java

Category: Java Application

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	false
profiling	false

Field	Type	Description
javaThreadId	long	Thread Id

SocketRead

default profiling startTime duration stackTrace 11 17 21 until JDK 23

Source src/jdk.jfr/share/classes/jdk/jfr/events/SocketReadEvent.java

Category: Java Application

Reading data from a socket

Configuration	enabled	stackTrace	threshold
default	true	true	20 ms
profiling	true	true	10 ms

Field	Type	Description
host	string	Remote Host
address	string	Remote Address
port	int	Remote Port
timeout	long: millis	Timeout Value
bytesRead	long: bytes	Bytes Read Number of bytes read from the socket
endOfStream	boolean	End of Stream If end of stream was reached

Examples 3

address	string	127.0.0.1
bytesRead	long: bytes	65
endOfStream	boolean	false
host	string
port	int	52655
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	846
lineNumber	int	72
method	Method
descriptor	string	(Ljava/nio/ByteBuffer;)I
hidden	boolean	false
modifiers	int	1
name	string	read
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	sun/nio/ch/SocketChannelImpl
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	sun/nio/ch
type	FrameType	JIT compiled
		…
truncated	boolean	false
startTime	long: millis	40501067417
timeout	long: millis	0

address	string	127.0.0.1
bytesRead	long: bytes	124
endOfStream	boolean	false
host	string	localhost
port	int	56563
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	846
lineNumber	int	72
method	Method
descriptor	string	(Ljava/nio/ByteBuffer;)I
hidden	boolean	false
modifiers	int	1
name	string	read
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	sun/nio/ch/SocketChannelImpl
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	sun/nio/ch
type	FrameType	JIT compiled
		…
truncated	boolean	false
startTime	long: millis	70432161542
timeout	long: millis	0

address	string	127.0.0.1
bytesRead	long: bytes	65
endOfStream	boolean	false
host	string
port	int	52294
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	846
lineNumber	int	72
method	Method
descriptor	string	(Ljava/nio/ByteBuffer;)I
hidden	boolean	false
modifiers	int	1
name	string	read
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	sun/nio/ch/SocketChannelImpl
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	sun/nio/ch
type	FrameType	JIT compiled
		…
truncated	boolean	false
startTime	long: millis	34327121667
timeout	long: millis	0

FileRead

default profiling startTime duration stackTrace 11 17 21 until JDK 23

Source src/jdk.jfr/share/classes/jdk/jfr/events/FileReadEvent.java

Category: Java Application

Appearing in: SerialGC, ZGC

Missing in: G1GC, ParallelGC, ShenandoahGC

Reading data from a file

Configuration	enabled	stackTrace	threshold
default	true	true	20 ms
profiling	true	true	10 ms

Field	Type	Description
path	string	Path Full path of the file, or N/A if a file descriptor was used to create the stream, for example System.in
bytesRead	long: bytes	Bytes Read Number of bytes read from the file (possibly 0)
endOfFile	boolean	End of File If end of file was reached

Examples 2

ZGC
SerialGC

bytesRead	long: bytes	8192
endOfFile	boolean	false
path	string	[...]/code/experiments/jfreventcollector/.cache/renaissance.jar
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	114
lineNumber	int	114
method	Method
descriptor	string	([BII)I
hidden	boolean	false
modifiers	int	1
name	string	read
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/io/RandomAccessFile
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/io
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	3341103166

bytesRead	long: bytes	4
endOfFile	boolean	false
path	string	[...]/code/experiments/jfreventcollector/harness-124622-12434569844652140370/apache-spark/lib/avro-ipc-1.10.2.jar
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	114
lineNumber	int	114
method	Method
descriptor	string	([BII)I
hidden	boolean	false
modifiers	int	1
name	string	read
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/io/RandomAccessFile
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/io
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	28227785042

VirtualThreadPinned

default profiling startTime duration stackTrace 21 until JDK 23

Source src/jdk.jfr/share/classes/jdk/jfr/events/VirtualThreadPinnedEvent.java

Category: Java Application

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	stackTrace	threshold
default	true	true	20 ms
profiling	true	true	20 ms

ThreadSleep

default profiling startTime duration stackTrace 11 17 21 until JDK 23

Source src/jdk.jfr/share/classes/jdk/jfr/events/ThreadSleepEvent.java

Category: Java Application

Excludes in stack trace: java.lang.Thread::afterSleep, java.lang.Thread::sleepNanos, java.lang.Thread::sleep

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	stackTrace	threshold
default	true	true	20 ms
profiling	true	true	10 ms

Field	Type	Description
time	long: nanos	Sleep Time

Examples 3

stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	5
lineNumber	int	474
method	Method
descriptor	string	(Ljdk/internal/event/ThreadSleepEvent;)V
hidden	boolean	false
modifiers	int	10
name	string	afterSleep
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/Thread
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	7914946333
time	long: nanos	7000000

stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	5
lineNumber	int	474
method	Method
descriptor	string	(Ljdk/internal/event/ThreadSleepEvent;)V
hidden	boolean	false
modifiers	int	10
name	string	afterSleep
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/Thread
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	7524095583
time	long: nanos	8000000

stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	5
lineNumber	int	474
method	Method
descriptor	string	(Ljdk/internal/event/ThreadSleepEvent;)V
hidden	boolean	false
modifiers	int	10
name	string	afterSleep
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/Thread
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	9458074334
time	long: nanos	8000000

Java Application Statistics

JavaThreadStatistics

default profiling startTime duration every chunk 11 17 21 23 24 graal vm

Category: Java Application / Statistics

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	1000 ms
profiling	true	1000 ms

Field	Type	Description
activeCount	long	Active Threads Number of live active threads including both daemon and non-daemon threads
daemonCount	long	Daemon Threads Number of live daemon threads
accumulatedCount	long	Accumulated Threads Number of threads created and also started since JVM start
peakCount	long	Peak Threads Peak live thread count since JVM start or when peak count was reset

Examples 3

accumulatedCount	long	23
activeCount	long	21
daemonCount	long	20
peakCount	long	21
startTime	long: millis	4422038667

accumulatedCount	long	137
activeCount	long	44
daemonCount	long	22
peakCount	long	85
startTime	long: millis	14062373334

accumulatedCount	long	417
activeCount	long	143
daemonCount	long	134
peakCount	long	143
startTime	long: millis	90184510625

ClassLoadingStatistics

default profiling startTime duration every chunk 11 17 21 23 24 graal vm

Category: Java Application / Statistics

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	1000 ms
profiling	true	1000 ms

Field	Type	Description
loadedClassCount	long	Loaded Class Count Number of classes loaded since JVM start
unloadedClassCount	long	Unloaded Class Count Number of classes unloaded since JVM start

Examples 3

loadedClassCount	long	5650
startTime	long: millis	27077227292
unloadedClassCount	long	914

loadedClassCount	long	7925
startTime	long: millis	26316377500
unloadedClassCount	long	2873

loadedClassCount	long	7968
startTime	long: millis	22239479875
unloadedClassCount	long	2895

ClassLoaderStatistics

default profiling startTime duration every chunk 11 17 21 23 24

Category: Java Application / Statistics

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	everyChunk
profiling	true	everyChunk

Field	Type	Description
classLoader	ClassLoader	Class Loader Consider contributing a description to jfreventcollector.
parentClassLoader	ClassLoader	Parent Class Loader Consider contributing a description to jfreventcollector.
classLoaderData	ulong: address	ClassLoaderData Pointer Pointer to the ClassLoaderData structure in the JVM
classCount	long	Classes Number of loaded classes
chunkSize	ulong: bytes	Total Chunk Size Total size of all allocated metaspace chunks (each chunk has several blocks)
blockSize	ulong: bytes	Total Block Size Total size of all allocated metaspace blocks (each chunk has several blocks)
hiddenClassCount	long 15+	Hidden Classes Number of hidden classes
hiddenChunkSize	ulong: bytes 15+	Total Hidden Classes Chunk Size Total size of all allocated metaspace chunks for hidden classes (each chunk has several blocks)
hiddenBlockSize	ulong: bytes 15+	Total Hidden Classes Block Size Total size of all allocated metaspace blocks for hidden classes (each chunk has several blocks)

Examples 3

blockSize	ulong: bytes	17763616
chunkSize	ulong: bytes	18277376
classCount	long	2538
classLoader	ClassLoader	null
classLoaderData	ulong: address	105553176969696
hiddenBlockSize	ulong: bytes	207856
hiddenChunkSize	ulong: bytes	347136
hiddenClassCount	long	113
parentClassLoader	ClassLoader	null
startTime	long: millis	15755910917

blockSize	ulong: bytes	44704
chunkSize	ulong: bytes	63488
classCount	long	9
classLoader	ClassLoader
name	string	platform
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	jdk/internal/loader/ClassLoaders$PlatformClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	jdk/internal/loader
classLoaderData	ulong: address	105553151822656
hiddenBlockSize	ulong: bytes	0
hiddenChunkSize	ulong: bytes	0
hiddenClassCount	long	0
parentClassLoader	ClassLoader	null
startTime	long: millis	36097325625

blockSize	ulong: bytes	300648
chunkSize	ulong: bytes	315392
classCount	long	119
classLoader	ClassLoader
name	string	app
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	jdk/internal/loader/ClassLoaders$AppClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	jdk/internal/loader
classLoaderData	ulong: address	105553170253216
hiddenBlockSize	ulong: bytes	0
hiddenChunkSize	ulong: bytes	0
hiddenClassCount	long	0
parentClassLoader	ClassLoader
name	string	platform
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	jdk/internal/loader/ClassLoaders$PlatformClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	jdk/internal/loader
startTime	long: millis	39222447833

ThreadAllocationStatistics

default profiling startTime every chunk 11 17 21 23 24 graal vm

Category: Java Application / Statistics

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	everyChunk
profiling	true	everyChunk

Field	Type	Description
allocated	ulong: bytes	Allocated Approximate number of bytes allocated since thread start
thread	Thread	Thread Consider contributing a description to jfreventcollector.

Examples 3

allocated	ulong: bytes	11856
startTime	long: millis	12401705334
thread	Thread
group	ThreadGroup
name	string	InnocuousThreadGroup
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	Common-Cleaner
javaThreadId	long	18
osName	string	Common-Cleaner
osThreadId	long	24323
virtual	boolean	false

allocated	ulong: bytes	144
startTime	long: millis	17899740292
thread	Thread
group	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	Finalizer
javaThreadId	long	6
osName	string	Finalizer
osThreadId	long	19715
virtual	boolean	false

allocated	ulong: bytes	20920
startTime	long: millis	15844318625
thread	Thread
group	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	C1 CompilerThread0
javaThreadId	long	12
osName	string	C1 CompilerThread0
osThreadId	long	22787
virtual	boolean	false

FinalizerStatistics

default profiling startTime end of every chunk 18 21 23 24

Category: Java Application / Statistics

Per class statistics about finalizers

Configuration	enabled	period
default	true	endChunk
profiling	true	endChunk

Field	Type	Description
finalizableClass	Class	Class Overriding Finalize
codeSource	Symbol	Code Source URL from where the class was loaded
objects	ulong	Finalizable Objects on Heap Number of objects on heap that can be finalized
totalFinalizersRun	ulong	Finalizers Run Total number of finalizers run since JVM start

Examples 3

codeSource	Symbol	file://[...]/code/experiments/jfreventcollector/harness-133125-7262456833842592188/twitter-finagle/lib/netty-buffer-4.1.72.Final.jar
finalizableClass	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hidden	boolean	false
modifiers	int	48
name	string	io/netty/buffer/PoolArena$HeapArena
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	io/netty/buffer
objects	ulong	16
startTime	long: millis	75090975542
totalFinalizersRun	ulong	0

codeSource	Symbol	file://[...]/code/experiments/jfreventcollector/harness-124447-3147988932466435938/twitter-finagle/lib/finagle-netty4_2.13-21.12.0.jar
finalizableClass	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hidden	boolean	false
modifiers	int	33
name	string	com/twitter/finagle/netty4/HashedWheelTimer
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	com/twitter/finagle/netty4
objects	ulong	1
startTime	long: millis	93710152708
totalFinalizersRun	ulong	0

codeSource	Symbol	file://[...]/code/experiments/jfreventcollector/harness-124622-12434569844652140370/twitter-finagle/lib/finagle-netty4_2.13-21.12.0.jar
finalizableClass	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hidden	boolean	false
modifiers	int	33
name	string	com/twitter/finagle/netty4/HashedWheelTimer
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	com/twitter/finagle/netty4
objects	ulong	1
startTime	long: millis	96681279583
totalFinalizersRun	ulong	0

DeprecatedInvocation

default profiling startTime stackTrace 22 23 24

Category: Java Application / Statistics

A unique invocation of a method that is annotated with @Deprecated. Packages and modules that are deprecated are ignored. At most 10 000 invocation sites and only the first invocation from a class is guaranteed to be included.

Configuration	enabled	level	stackTrace
default	true	forRemoval	true
profiling	true	forRemoval	true

Field	Type	Description
method	Method	Deprecated Method
invocationTime	Ticks	Invocation Time The time the deprecated method was invoked for the first time
forRemoval	boolean	For Removal

ExceptionStatistics

default profiling startTime duration stackTrace 11 17 21 until JDK 23

Source src/jdk.jfr/share/classes/jdk/jfr/events/ExceptionStatisticsEvent.java

Category: Java Application / Statistics

Number of objects derived from java.lang.Throwable that have been created

Configuration	enabled	period
default	true	1000 ms
profiling	true	1000 ms

Field	Type	Description
throwables	long	Exceptions Created

Examples 3

stackTrace	StackTrace	null
startTime	long: millis	46482224875
throwables	long	202079

stackTrace	StackTrace	null
startTime	long: millis	38715755375
throwables	long	202090

stackTrace	StackTrace	null
startTime	long: millis	82395573042
throwables	long	208127

DirectBufferStatistics

default profiling startTime duration stackTrace 15 17 21 23 24

Source src/jdk.jfr/share/classes/jdk/jfr/events/DirectBufferStatisticsEvent.java

Category: Java Application / Statistics

Statistics of direct buffer

Configuration	enabled	period
default	true	5 s
profiling	true	5 s

Examples 3

stackTrace	StackTrace	null
startTime	long: millis	21201643875

stackTrace	StackTrace	null
startTime	long: millis	72261980875

stackTrace	StackTrace	null
startTime	long: millis	15716556167

Java Development Kit

X509Certificate

startTime duration stackTrace 11 17 21 until JDK 23

Source src/jdk.jfr/share/classes/jdk/jfr/events/X509CertificateEvent.java

Category: Java Development Kit / Security

Details of X.509 Certificate parsed by JDK

Configuration	enabled	stackTrace
default	false	true
profiling	false	true

Field	Type	Description
algorithm	string	Signature Algorithm
serialNumber	string	Serial Number Consider contributing a description to jfreventcollector.
subject	string	Subject Consider contributing a description to jfreventcollector.
issuer	string	Issuer Consider contributing a description to jfreventcollector.
keyType	string	Key Type Consider contributing a description to jfreventcollector.
keyLength	int	Key Length
certificateId	ulong: certificateId	Certificate Id
validFrom	long: epochmillis	Valid From
validUntil	long: epochmillis	Valid Until

Deserialization

startTime duration stackTrace 11 17 21 until JDK 23

Source src/jdk.jfr/share/classes/jdk/jfr/events/DeserializationEvent.java

Category: Java Development Kit / Serialization

Results of deserialization and ObjectInputFilter checks

Configuration	enabled	stackTrace
default	false	true
profiling	false	true

Field	Type	Description
filterConfigured	boolean	Filter Configured
filterStatus	string	Filter Status Consider contributing a description to jfreventcollector.
type	Class	Type Consider contributing a description to jfreventcollector.
arrayLength	int	Array Length
objectReferences	long	Object References
depth	long	Depth
bytesRead	long	Bytes Read
exceptionType	Class	Exception Type Consider contributing a description to jfreventcollector.
exceptionMessage	string	Exception Message Consider contributing a description to jfreventcollector.

TLSHandshake

startTime duration stackTrace 11 17 21 until JDK 23

Source src/jdk.jfr/share/classes/jdk/jfr/events/TLSHandshakeEvent.java

Category: Java Development Kit / Security

Excludes in stack trace: sun.security.ssl.Finished::recordEvent

Parameters used in TLS Handshake

Configuration	enabled	stackTrace
default	false	true
profiling	false	true

Field	Type	Description
peerHost	string	Peer Host Consider contributing a description to jfreventcollector.
peerPort	int	Peer Port
protocolVersion	string	Protocol Version Consider contributing a description to jfreventcollector.
cipherSuite	string	Cipher Suite Consider contributing a description to jfreventcollector.
certificateId	ulong: certificateId	Certificate Id Peer Certificate Id

X509Validation

startTime duration stackTrace 11 17 21 until JDK 23

Source src/jdk.jfr/share/classes/jdk/jfr/events/X509ValidationEvent.java

Category: Java Development Kit / Security

Serial numbers from X.509 Certificates forming chain of trust

Configuration	enabled	stackTrace
default	false	true
profiling	false	true

Field	Type	Description
certificateId	ulong: certificateId	Certificate Id
certificatePosition	int	Certificate Position Certificate position in chain of trust, 1 = trust anchor
validationCounter	long	Validation Counter

VirtualThreadSubmitFailed

default profiling startTime duration stackTrace 21 until JDK 23

Source src/jdk.jfr/share/classes/jdk/jfr/events/VirtualThreadSubmitFailedEvent.java

Category: Java Development Kit / Threading

Submit of task for virtual thread failed

Configuration	enabled	stackTrace
default	true	true
profiling	true	true

Field	Type	Description
javaThreadId	long	Thread Id
exceptionMessage	string	Exception Message Consider contributing a description to jfreventcollector.

SecurityProviderService

startTime duration stackTrace 11 17 21 until JDK 23

Source src/jdk.jfr/share/classes/jdk/jfr/events/SecurityProviderServiceEvent.java

Category: Java Development Kit / Security

Excludes in stack trace: java.security.Provider::getService

Details of Provider.getInstance(String type, String algorithm) calls

Configuration	enabled	stackTrace
default	false	true
profiling	false	true

Field	Type	Description
type	string	Type of Service
algorithm	string	Algorithm Name
provider	string	Security Provider

Examples 3

algorithm	string	SHA-1
provider	string	SUN
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	136
lineNumber	int	1298
method	Method
descriptor	string	(Ljava/lang/String;Ljava/lang/String;)Ljava/security/Provider$Service;
hidden	boolean	false
modifiers	int	1
name	string	getService
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	1057
name	string	java/security/Provider
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/security
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	786168667
type	string	MessageDigest

algorithm	string	NativePRNG
provider	string	SUN
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	136
lineNumber	int	1298
method	Method
descriptor	string	(Ljava/lang/String;Ljava/lang/String;)Ljava/security/Provider$Service;
hidden	boolean	false
modifiers	int	1
name	string	getService
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	1057
name	string	java/security/Provider
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/security
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	537709583
type	string	SecureRandom

algorithm	string	NativePRNG
provider	string	SUN
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	136
lineNumber	int	1298
method	Method
descriptor	string	(Ljava/lang/String;Ljava/lang/String;)Ljava/security/Provider$Service;
hidden	boolean	false
modifiers	int	1
name	string	getService
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	1057
name	string	java/security/Provider
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/security
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	463012625
type	string	SecureRandom

SecurityPropertyModification

startTime duration stackTrace 11 17 21 until JDK 23

Source src/jdk.jfr/share/classes/jdk/jfr/events/SecurityPropertyModificationEvent.java

Category: Java Development Kit / Security

Excludes in stack trace: java.security.Security::setProperty

Modification of Security property

Configuration	enabled	stackTrace
default	false	true
profiling	false	true

Field	Type	Description
key	string	Key Consider contributing a description to jfreventcollector.
value	string	Value Consider contributing a description to jfreventcollector.

InitialSecurityProperty

default profiling startTime duration stackTrace 17 21 23 24

Source src/jdk.jfr/share/classes/jdk/jfr/events/InitialSecurityPropertyEvent.java

Category: Java Development Kit / Security

Initial Security Properties

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
key	string	Key Consider contributing a description to jfreventcollector.
value	string	Value Consider contributing a description to jfreventcollector.

Examples 3

key	string	http.auth.digest.disabledAlgorithms
stackTrace	StackTrace	null
startTime	long: millis	693055542
value	string	MD5, SHA-1

key	string	keystore.type
stackTrace	StackTrace	null
startTime	long: millis	437644500
value	string	pkcs12

key	string	security.provider.11
stackTrace	StackTrace	null
startTime	long: millis	379196167
value	string	JdkSASL

Operating System

OSInformation

default profiling startTime duration end of every chunk 11 17 21 23 24 graal vm

Category: Operating System

Description of the OS the JVM runs on, for example, a uname-like output

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
osVersion	string	OS Version

Examples 3

osVersion	string	uname: Darwin 23.2.0 Darwin Kernel Version 23.2.0: Wed Nov 15 21:53:34 PST 2023; root:xnu-10002.61.3~2/RELEASE_ARM64_T8103 arm64
startTime	long: millis	17889807917

osVersion	string	uname: Darwin 23.2.0 Darwin Kernel Version 23.2.0: Wed Nov 15 21:53:34 PST 2023; root:xnu-10002.61.3~2/RELEASE_ARM64_T8103 arm64
startTime	long: millis	62990155125

osVersion	string	uname: Darwin 23.2.0 Darwin Kernel Version 23.2.0: Wed Nov 15 21:53:34 PST 2023; root:xnu-10002.61.3~2/RELEASE_ARM64_T8103 arm64
startTime	long: millis	84413955958

VirtualizationInformation

default profiling startTime duration end of every chunk 11 17 21 23 24

Category: Operating System

Description of the virtualization technology the JVM runs on

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
name	string	Name

Examples 3

name	string	No virtualization detected
startTime	long: millis	30585953083

name	string	No virtualization detected
startTime	long: millis	27599398500

name	string	No virtualization detected
startTime	long: millis	84413956458

InitialEnvironmentVariable

default profiling startTime end of every chunk 11 17 21 23 24 graal vm

Category: Operating System

Key-value pairs for environment variables at JVM startup

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
key	string	Key
value	string	Value

Examples 3

key	string	__CFBundleIdentifier
startTime	long: millis	364250500
value	string	com.jetbrains.pycharm.ce

key	string	XPC_FLAGS
startTime	long: millis	17889813583
value	string	0x0

key	string	LC_CTYPE
startTime	long: millis	12862199292
value	string	UTF-8

SystemProcess

default profiling startTime duration end of every chunk 11 17 21 23 24

Category: Operating System

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	endChunk
profiling	true	endChunk

Field	Type	Description
pid	string	Process Identifier
commandLine	string	Command Line

Examples 3

commandLine	string	/usr/libexec/smd
pid	string	534
startTime	long: millis	14787855958

commandLine	string	/System/Library/PrivateFrameworks/CoreDuetContext.framework/Versions/A/Resources/contextstored
pid	string	610
startTime	long: millis	12397004584

commandLine	string	/usr/libexec/mobileassetd
pid	string	648
startTime	long: millis	16726490792

CPUInformation

default profiling startTime duration end of every chunk 11 17 21 23 24

Category: Operating System / Processor

Characteristics and descriptions of the processor(s) the JVM is running on

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
cpu	string	Type
description	string	Description
sockets	uint	Sockets
cores	uint	Cores
hwThreads	uint	Hardware Threads

Examples 3

cores	uint	8
cpu	string	AArch64
description	string	AArch64 0x61:0x0:0x1b588bb3:0, fp, asimd, aes, pmull, sha1, sha256, crc32, lse, sha3, sha512
hwThreads	uint	8
sockets	uint	8
startTime	long: millis	40019904833

cores	uint	8
cpu	string	AArch64
description	string	AArch64 0x61:0x0:0x1b588bb3:0, fp, asimd, aes, pmull, sha1, sha256, crc32, lse, sha3, sha512
hwThreads	uint	8
sockets	uint	8
startTime	long: millis	50916140209

cores	uint	8
cpu	string	AArch64
description	string	AArch64 0x61:0x0:0x1b588bb3:0, fp, asimd, aes, pmull, sha1, sha256, crc32, lse, sha3, sha512
hwThreads	uint	8
sockets	uint	8
startTime	long: millis	93733088958

CPUTimeStampCounter

default profiling startTime duration end of every chunk 11 17 21 23 24

Category: Operating System / Processor

Information about the CPU time stamp mechanism / (RD)TSC

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
fastTimeEnabled	boolean	Fast Time
fastTimeAutoEnabled	boolean	Trusted Platform
osFrequency	long: hertz	OS Frequency
fastTimeFrequency	long: hertz	Fast Time Frequency

Examples 3

fastTimeAutoEnabled	boolean	false
fastTimeEnabled	boolean	false
fastTimeFrequency	long: hertz	1000000000
osFrequency	long: hertz	1000000000
startTime	long: millis	40019905958

fastTimeAutoEnabled	boolean	false
fastTimeEnabled	boolean	false
fastTimeFrequency	long: hertz	1000000000
osFrequency	long: hertz	1000000000
startTime	long: millis	27599413459

fastTimeAutoEnabled	boolean	false
fastTimeEnabled	boolean	false
fastTimeFrequency	long: hertz	1000000000
osFrequency	long: hertz	1000000000
startTime	long: millis	17889821333

CPULoad

default profiling startTime duration every chunk 11 17 21 23 24

Category: Operating System / Processor

Information about the recent CPU usage of the JVM process

Configuration	enabled	period
default	true	1000 ms
profiling	true	1000 ms

Field	Type	Description
jvmUser	float: percentage	JVM User
jvmSystem	float: percentage	JVM System
machineTotal	float: percentage	Machine Total

Examples 3

jvmSystem	float: percentage	2.3451833E-4
jvmUser	float: percentage	0.004804558
machineTotal	float: percentage	0.90932983
startTime	long: millis	58103833292

jvmSystem	float: percentage	0.0023389559
jvmUser	float: percentage	0.010674531
machineTotal	float: percentage	0.9741602
startTime	long: millis	11781246417

jvmSystem	float: percentage	1.7930071E-4
jvmUser	float: percentage	0.005281212
machineTotal	float: percentage	0.85315406
startTime	long: millis	84639873125

ThreadCPULoad

default profiling startTime duration eventThread every chunk 11 17 21 23 24 graal vm

Category: Operating System / Processor

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	10 s
profiling	true	10 s

Field	Type	Description
user	float: percentage	User Mode CPU Load User mode thread CPU load
system	float: percentage	System Mode CPU Load System mode thread CPU load

Examples 3

startTime	long: millis	11595339875
system	float: percentage	9.0697205E-5
user	float: percentage	0.00270429

startTime	long: millis	10760177417
system	float: percentage	0.0012110138
user	float: percentage	0.01663047

startTime	long: millis	10643453375
system	float: percentage	0.0026022547
user	float: percentage	0.002039518

ThreadContextSwitchRate

default profiling startTime duration every chunk 11 17 21 23 24

Category: Operating System / Processor

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	10 s
profiling	true	10 s

Field	Type	Description
switchRate	float: hertz	Switch Rate Number of context switches per second

Examples 3

startTime	long: millis	31668575042
switchRate	float: hertz	79236.12

startTime	long: millis	73569042667
switchRate	float: hertz	8249.412

startTime	long: millis	88355022583
switchRate	float: hertz	5764.792

NetworkUtilization

default profiling startTime every chunk 11 17 21 23 24

Category: Operating System / Network

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	5 s
profiling	true	5 s

Field	Type	Description
networkInterface	NetworkInterfaceName	Network Interface Network Interface Name
readRate	long: bits-per-second	Read Rate Number of incoming bits per second
writeRate	long: bits-per-second	Write Rate Number of outgoing bits per second

Examples 3

networkInterface	NetworkInterfaceName	en0
readRate	long: bits-per-second	3877624
startTime	long: millis	93418766750
writeRate	long: bits-per-second	2643320

networkInterface	NetworkInterfaceName	en0
readRate	long: bits-per-second	3861664
startTime	long: millis	52507466375
writeRate	long: bits-per-second	2629384

networkInterface	NetworkInterfaceName	utun5
readRate	long: bits-per-second	51736
startTime	long: millis	41764489750
writeRate	long: bits-per-second	16160

PhysicalMemory

default profiling startTime duration every chunk 11 17 21 23 24 graal vm

Category: Operating System / Memory

OS Physical Memory

Configuration	enabled	period
default	true	everyChunk
profiling	true	everyChunk

Field	Type	Description
totalSize	ulong: bytes	Total Size Total amount of physical memory available to OS
usedSize	ulong: bytes	Used Size Total amount of physical memory in use

Examples 3

startTime	long: millis	22062989125
totalSize	ulong: bytes	17179869184
usedSize	ulong: bytes	16003137536

startTime	long: millis	39596854458
totalSize	ulong: bytes	17179869184
usedSize	ulong: bytes	17094295552

startTime	long: millis	78959927333
totalSize	ulong: bytes	17179869184
usedSize	ulong: bytes	17079877632

ContainerCPUUsage

default profiling startTime duration stackTrace 17 21 23 24

Source src/jdk.jfr/share/classes/jdk/jfr/events/ContainerCPUUsageEvent.java

Category: Operating System / Processor

Container CPU usage related information

Configuration	enabled	period
default	true	30 s
profiling	true	30 s

Field	Type	Description
cpuTime	long: nanos	CPU Time Aggregate time consumed by all tasks in the container
cpuUserTime	long: nanos	CPU User Time Aggregate user time consumed by all tasks in the container
cpuSystemTime	long: nanos	CPU System Time Aggregate system time consumed by all tasks in the container

ContainerIOUsage

default profiling startTime duration stackTrace 17 21 23 24

Source src/jdk.jfr/share/classes/jdk/jfr/events/ContainerIOUsageEvent.java

Category: Operating System / File System

Container IO usage related information

Configuration	enabled	period
default	true	30 s
profiling	true	30 s

Field	Type	Description
serviceRequests	long	Block IO Request Count Number of block IO requests to the disk that have been issued by the container
dataTransferred	long: bytes	Block IO Transfer Number of block IO bytes that have been transferred to/from the disk by the container

ProcessStart

default profiling startTime duration stackTrace 17 21 until JDK 23

Source src/jdk.jfr/share/classes/jdk/jfr/events/ProcessStartEvent.java

Category: Operating System

Excludes in stack trace: java.lang.ProcessBuilder, java.lang.Runtime::exec

Operating system process started

Configuration	enabled	stackTrace
default	true	true
profiling	true	true

Field	Type	Description
pid	long	Process Id
directory	string	Directory Consider contributing a description to jfreventcollector.
command	string	Command Consider contributing a description to jfreventcollector.

ContainerConfiguration

default profiling startTime duration stackTrace 17 21 23 24

Source src/jdk.jfr/share/classes/jdk/jfr/events/ContainerConfigurationEvent.java

Category: Operating System

A set of container specific attributes

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
containerType	string	Container Type Container type information
cpuSlicePeriod	long: microseconds	CPU Slice Period Length of the scheduling period for processes within the container
cpuQuota	long: microseconds	CPU Quota Total available run-time allowed during each scheduling period for all tasks in the container
cpuShares	long	CPU Shares Relative weighting of processes with the container used for prioritizing the scheduling of processes across all containers running on a host
effectiveCpuCount	long	Effective CPU Count Number of effective processors that this container has available to it
memorySoftLimit	long: bytes	Memory Soft Limit Hint to the operating system that allows groups to specify the minimum required amount of physical memory
memoryLimit	long: bytes	Memory Limit Maximum amount of physical memory that can be allocated in the container
swapMemoryLimit	long: bytes	Memory and Swap Limit Maximum amount of physical memory and swap space, in bytes, that can be allocated in the container
hostTotalMemory	long: bytes 20+	Container Host Total Memory Total memory of the host running the container

ContainerCPUThrottling

default profiling startTime duration stackTrace 17 21 23 24

Source src/jdk.jfr/share/classes/jdk/jfr/events/ContainerCPUThrottlingEvent.java

Category: Operating System / Processor

Container CPU throttling related information

Configuration	enabled	period
default	true	30 s
profiling	true	30 s

Field	Type	Description
cpuElapsedSlices	long	CPU Elapsed Slices Number of time-slice periods that have elapsed if a CPU quota has been setup for the container
cpuThrottledSlices	long	CPU Throttled Slices Number of time-slice periods that the CPU has been throttled or limited due to exceeding CPU quota
cpuThrottledTime	long: nanos	CPU Throttled Time Total time duration, in nanoseconds, that the CPU has been throttled or limited due to exceeding CPU quota

ContainerMemoryUsage

default profiling startTime duration stackTrace 17 21 23 24

Source src/jdk.jfr/share/classes/jdk/jfr/events/ContainerMemoryUsageEvent.java

Category: Operating System / Memory

Container memory usage related information

Configuration	enabled	period
default	true	30 s
profiling	true	30 s

Field	Type	Description
memoryFailCount	long	Memory Fail Count Number of times that user memory requests in the container have exceeded the memory limit
memoryUsage	long: bytes	Memory Usage Amount of physical memory, in bytes, that is currently allocated in the current container
swapMemoryUsage	long: bytes	Memory and Swap Usage Amount of physical memory and swap space, in bytes, that is currently allocated in the current container

Truffle Compiler

graal.compiler.truffle.CompilerStatistics

startTime duration every 1s graal vm only

Category: Truffle Compiler

Truffe Compiler Statistics

Field	Type	Description
compiledMethods	ulong	Compiled Methods Compiled Methods
bailouts	ulong	Bailouts Bailouts
invalidations	ulong	Invalidated Compilations Invalidated Compilations
compiledCodeSize	ulong: bytes	Compilation Resulting Size Compilation Resulting Size
totalTime	long: millis	Total Time Total Time
peakTime	long: millis	Peak Time Peak Time

graal.compiler.truffle.Deoptimization

startTime duration graal vm only

Category: Truffle Compiler

Truffle Call Target Deoptimization

Field	Type	Description
source	string	Source Compiled Source
language	string	Language Guest Language
rootFunction	string	Root Function Root Function

graal.compiler.truffle.AssumptionInvalidation

startTime duration stackTrace graal vm only

Category: Truffle Compiler

Truffle Assumption Invalidation

Field	Type	Description
source	string	Source Compiled Source
language	string	Language Guest Language
rootFunction	string	Root Function Root Function
reason	string	Reason Invalidation Reason

graal.compiler.truffle.CompilationFailure

startTime duration graal vm only

Category: Truffle Compiler

Truffe Compilation Failures

Field	Type	Description
source	string	Source Compiled Source
language	string	Language Guest Language
rootFunction	string	Root Function Root Function
permanentFailure	boolean	Permanent Failure Permanent Failure
failureReason	string	Failure Reason Failure Reason

graal.compiler.truffle.Compilation

startTime duration graal vm only

Category: Truffle Compiler

Truffe Compilation

Field	Type	Description
source	string	Source Compiled Source
language	string	Language Guest Language
rootFunction	string	Root Function Root Function
success	boolean	Succeeded Compilation Status
compiledCodeSize	uint: bytes	Compiled Code Size Compiled Code Size
compiledCodeAddress	long	Compiled Code Address Compiled Code Address
inlinedCalls	uint	Inlined Calls Inlined Calls
dispatchedCalls	uint	Dispatched Calls Dispatched Calls
graalNodeCount	uint	Graal Nodes Graal Node Count
peNodeCount	uint	Truffle Nodes Truffle Node Count
peTime	ulong	Partial Evaluation Time Partial Evaluation Time in Milliseconds

Types

Bytecode

14+

Bytecode Instruction

Field	Type	Description
bytecode	string	Instruction

Examples 3

ifeq

invokevirtual

CalleeMethod

No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
type	string	Class
name	string	Method Name
descriptor	string	Method Descriptor

Examples 3

descriptor	string	([BI)C
name	string	getChar
type	string	java/lang/StringUTF16

descriptor	string	(Ljava/lang/String;)Ljava/lang/AbstractStringBuilder;
name	string	append
type	string	java/lang/AbstractStringBuilder

descriptor	string	(Ljava/lang/String;)Ljava/lang/AbstractStringBuilder;
name	string	append
type	string	java/lang/AbstractStringBuilder

ChunkHeader

14+

Chunk Header No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
payload array	byte	Payload

Class

Java Class

Field	Type	Description
classLoader	ClassLoader	Class Loader Consider contributing a description to jfreventcollector.
name	Symbol	Name Consider contributing a description to jfreventcollector.
package	Package	Package Consider contributing a description to jfreventcollector.
modifiers	int	Access Modifiers
hidden	boolean 15+	Hidden

ClassLoader

Java Class Loader

Field	Type	Description
type	Class	Type Consider contributing a description to jfreventcollector.
name	Symbol	Name Consider contributing a description to jfreventcollector.

CodeBlobType

Code Blob Type No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
type	string	Type

Examples 3

CodeHeap 'non-nmethods'

CodeHeap 'profiled nmethods'

CompilerPhaseType

Compiler Phase Type No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
phase	string	Phase

CompilerType

14+

Compiler Type No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
compiler	string	Compiler

Examples 3

CopyFailed

No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
objectCount	ulong	Object Count
firstSize	ulong: bytes	First Failed Object Size
smallestSize	ulong: bytes	Smallest Failed Object Size
totalSize	ulong: bytes	Total Object Size

DeoptimizationAction

14+

Deoptimization Action No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
action	string	Action

Examples 3

maybe_recompile

reinterpret

DeoptimizationReason

14+

Deoptimization Reason No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
reason	string	Reason

Examples 3

class_check

unstable_if

FlagValueOrigin

Flag Value Origin No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
origin	string	Origin

Examples 3

Default

FrameType

Frame type No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
description	string	Description

Examples 3

Interpreted

Native

JIT compiled

G1EvacuationStatistics

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
gcId	uint	GC Identifier
allocated	ulong: bytes	Allocated Total memory allocated by PLABs
wasted	ulong: bytes	Wasted Total memory wasted within PLABs due to alignment or refill
used	ulong: bytes	Used Total memory occupied by objects within PLABs
undoWaste	ulong: bytes	Undo Wasted Total memory wasted due to allocation undo within PLABs
regionEndWaste	ulong: bytes	Region End Wasted Total memory wasted at the end of regions due to refill
regionsRefilled	uint	Region Refills Number of regions refilled
numPlabsFilled	ulong 20+	PLAB Fills Number of PLABs filled
directAllocated	ulong: bytes	Allocated (direct) Total memory allocated using direct allocation outside of PLABs
numDirectAllocated	ulong 20+	Direct allocations Number of direct allocations
failureUsed	ulong: bytes	Used (failure) Total memory occupied by objects in regions where evacuation failed
failureWaste	ulong: bytes	Wasted (failure) Total memory left unused in regions where evacuation failed

Examples 2

G1GC
G1GC

allocated	ulong: bytes	234432
directAllocated	ulong: bytes	11641688
failureUsed	ulong: bytes	0
failureWaste	ulong: bytes	0
gcId	uint	69
numDirectAllocated	ulong	5
numPlabsFilled	ulong	7504122885671534260
regionEndWaste	ulong: bytes	857552
regionsRefilled	uint	7
undoWaste	ulong: bytes	0
used	ulong: bytes	209408
wasted	ulong: bytes	2816

allocated	ulong: bytes	0
directAllocated	ulong: bytes	0
failureUsed	ulong: bytes	0
failureWaste	ulong: bytes	0
gcId	uint	19
numDirectAllocated	ulong	6147041496
numPlabsFilled	ulong	0
regionEndWaste	ulong: bytes	0
regionsRefilled	uint	0
undoWaste	ulong: bytes	0
used	ulong: bytes	0
wasted	ulong: bytes	0

G1HeapRegionType

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

G1 Heap Region Type No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
type	string	Type

Examples 3

Old

Eden

Free

G1YCType

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

G1 YC Type No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
type	string	Type

Examples 1

G1GC

Normal

GCCause

GC Cause No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
cause	string	Cause

Examples 3

G1 Evacuation Pause

Allocation Failure

GCName

GC Name No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
name	string	Name

Examples 3

G1New

G1Old

ParallelScavenge

GCThresholdUpdater

GC Threshold Updater No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
updater	string	Updater

Examples 3

compute_new_size

GCWhen

GC When No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
when	string	When

Examples 3

Before GC

After GC

Before GC

InflateCause

Inflation Cause No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
cause	string	Cause

MetadataType

Metadata Type No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
type	string	Type

Examples 3

Class

Metadata

MetaspaceObjectType

Metaspace Object Type No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
type	string	Type

Examples 3

Method

ConstMethod

ConstantPool

MetaspaceSizes

No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
committed	ulong: bytes	Committed Committed memory for this space
used	ulong: bytes	Used Bytes allocated by objects in the space
reserved	ulong: bytes	Reserved Reserved memory for this space

Examples 3

committed	ulong: bytes	4325376
reserved	ulong: bytes	1073741824
used	ulong: bytes	4175480

committed	ulong: bytes	36765696
reserved	ulong: bytes	1140850688
used	ulong: bytes	36415952

committed	ulong: bytes	32440320
reserved	ulong: bytes	67108864
used	ulong: bytes	32240472

Method

Java Method

Field	Type	Description
type	Class	Type Consider contributing a description to jfreventcollector.
name	Symbol	Name Consider contributing a description to jfreventcollector.
descriptor	Symbol	Descriptor Consider contributing a description to jfreventcollector.
modifiers	int	Access Modifiers
hidden	boolean	Hidden

Module

Module No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
name	Symbol	Name Consider contributing a description to jfreventcollector.
version	Symbol	Version Consider contributing a description to jfreventcollector.
location	Symbol	Location Consider contributing a description to jfreventcollector.
classLoader	ClassLoader	Class Loader Consider contributing a description to jfreventcollector.

NMTType

21+

Native Memory Tracking Type

Field	Type	Description
name	string	Name

NarrowOopMode

Narrow Oop Mode No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
mode	string	Mode

Examples 3

Zero based

NetworkInterfaceName

Network Interface No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
networkInterface	string	Network Interface Network Interface Name

Examples 3

en0

utun5

en0

ObjectSpace

Appearing in: ParallelGC

Missing in: G1GC, SerialGC, ShenandoahGC, ZGC

No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
start	ulong: address	Start Address Start address of the space
end	ulong: address	End Address End address of the space
used	ulong: bytes	Used Bytes allocated by objects in the space
size	ulong: bytes	Size Size of the space

Examples 3

end	ulong: address	32995540992
size	ulong: bytes	67108864
start	ulong: address	32928432128
used	ulong: bytes	29700368

end	ulong: address	30244077568
size	ulong: bytes	179306496
start	ulong: address	30064771072
used	ulong: bytes	0

end	ulong: address	33017561088
size	ulong: bytes	11010048
start	ulong: address	33006551040
used	ulong: bytes	0

OldObject

Old Object No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
address	ulong: address	Memory Address
type	Class	Java Class
description	string	Object Description Object description
referrer	Reference	Referrer Object Object referencing this object

Examples 3

address	ulong: address	31611118368
description	string	null
referrer	Reference	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	0
name	string	[Ljava/util/concurrent/ForkJoinTask;
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util/concurrent

address	ulong: address	30176071064
description	string	null
referrer	Reference	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	0
name	string	[B
package	Package	null

address	ulong: address	30145655088
description	string	null
referrer	Reference	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	48
name	string	java/util/concurrent/SynchronousQueue$TransferStack$SNode
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util/concurrent

OldObjectArray

Old Object Array No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
size	int	Array Size Size of array
index	int	Index Index in the array

OldObjectField

Old Object Field No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
name	string	Field Name of field
modifiers	short	Field Modifiers Field modifiers

OldObjectGcRoot

GC Root No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
description	string	Root Description Root information
system	OldObjectRootSystem	System The subsystem of origin for the root
type	OldObjectRootType	Type The root type

Examples 3

null

OldObjectRootSystem

GC Root System No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
system	string	System

OldObjectRootType

GC Root Type No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
type	string	Type

Package

Package No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
name	Symbol	Name Consider contributing a description to jfreventcollector.
module	Module	Module Consider contributing a description to jfreventcollector.
exported	boolean	Exported

Reference

Reference No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
array	OldObjectArray	Array Information Array or null if it is not an array
field	OldObjectField	Field Information Field or null if it is an array
object	OldObject	Object Object holder for this reference
skip	int	Skip Value The object is this many hops away

Examples 3

null

ReferenceType

Reference Type No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
type	string	Type

Examples 3

Phantom reference

ShenandoahHeapRegionState

Appearing in: ShenandoahGC

Missing in: G1GC, ParallelGC, SerialGC, ZGC

Shenandoah Heap Region State No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
state	string	State

Examples 3

Empty Uncommitted

Empty Committed

Regular

StackFrame

No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
method	Method	Java Method
lineNumber	int	Line Number
bytecodeIndex	int	Bytecode Index
type	FrameType	Frame Type

Examples 3

bytecodeIndex	int	0
lineNumber	int	199
method	Method
descriptor	string	(Ljava/security/CodeSource;)Ljava/security/PermissionCollection;
hidden	boolean	false
modifiers	int	4
name	string	getPermissions
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/security/SecureClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/security
type	FrameType	Interpreted

bytecodeIndex	int	301
lineNumber	int	1442
method	Method
descriptor	string	(Ljava/lang/CharSequence;IZ)[Ljava/lang/String;
hidden	boolean	false
modifiers	int	2
name	string	split
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/util/regex/Pattern
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util/regex
type	FrameType	JIT compiled

bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	(Ljava/lang/String;)Ljava/lang/Class;
hidden	boolean	false
modifiers	int	266
name	string	findBootstrapClass
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	1057
name	string	java/lang/ClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Native

StackTrace

Stacktrace No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
truncated	boolean	Truncated
frames array	StackFrame struct	Stack Frames

Symbol

Symbol No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
string	string	String

Examples 3

file://[...]/code/experiments/jfreventcollector/harness-133125-7262456833842592188/twitter-finagle/lib/netty-buffer-4.1.72.Final.jar

file://[...]/code/experiments/jfreventcollector/harness-124622-12434569844652140370/twitter-finagle/lib/finagle-netty4_2.13-21.12.0.jar

file://[...]/code/experiments/jfreventcollector/harness-124447-3147988932466435938/twitter-finagle/lib/finagle-netty4_2.13-21.12.0.jar

Thread

Thread No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
osName	string	OS Thread Name
osThreadId	long	OS Thread Id
javaName	string	Java Thread Name
javaThreadId	long	Java Thread Id
group	ThreadGroup	Java Thread Group
virtual	boolean 19+	Virtual Thread

ThreadGroup

Thread Group No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
parent	ThreadGroup	Parent Consider contributing a description to jfreventcollector.
name	string	Name

Examples 3

name	string	system
parent	ThreadGroup	null

name	string	InnocuousThreadGroup
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null

null

ThreadState

Java Thread State

Field	Type	Description
name	string	Name

Examples 3

STATE_RUNNABLE

VMOperationType

VM Operation Type No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
type	string	Type

Examples 3

ICBufferFull

HandshakeAllThreads

VirtualSpace

No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
start	ulong: address	Start Address Start address of the virtual space
committedEnd	ulong: address	Committed End Address End address of the committed memory for the virtual space
committedSize	ulong: bytes	Committed Size Size of the committed memory for the virtual space
reservedEnd	ulong: address	Reserved End Address End address of the reserved memory for the virtual space
reservedSize	ulong: bytes	Reserved Size Size of the reserved memory for the virtual space

Examples 3

committedEnd	ulong: address	31690588160
committedSize	ulong: bytes	1625817088
reservedEnd	ulong: address	34359738368
reservedSize	ulong: bytes	4294967296
start	ulong: address	30064771072

committedEnd	ulong: address	30379343872
committedSize	ulong: bytes	314572800
reservedEnd	ulong: address	34359738368
reservedSize	ulong: bytes	4294967296
start	ulong: address	30064771072

committedEnd	ulong: address	30244077568
committedSize	ulong: bytes	179306496
reservedEnd	ulong: address	32928432128
reservedSize	ulong: bytes	2863661056
start	ulong: address	30064771072

ZPageTypeType

15+

Appearing in: ZGC

Missing in: G1GC, ParallelGC, SerialGC, ShenandoahGC

Z Page Type No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
type	string	Type

Examples 2

Small

Medium

ZStatisticsCounterType

Appearing in: ZGC

Missing in: G1GC, ParallelGC, SerialGC, ShenandoahGC

Z Statistics Counter No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
counter	string	Counter

Examples 1

Page Cache Hit L1

ZStatisticsSamplerType

Appearing in: ZGC

Missing in: G1GC, ParallelGC, SerialGC, ShenandoahGC

Z Statistics Sampler No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.

Field	Type	Description
sampler	string	Sampler

Examples 1

Concurrent Weak Roots OopStorageSet

XML Content Types

address

Annotation: jdk.jfr.MemoryAddress

Examples 3

4520263680

6698287104

bits-per-second

Annotation: jdk.jfr.DataAmount(BITS), jdk.jfr.Frequency

Examples 3

16160

51736

3861664

bytes

Annotation: jdk.jfr.DataAmount(BYTES)

Examples 3

4294967296

560042008

754974720

bytes-per-second

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

Annotation: jdk.jfr.DataAmount(BYTES), jdk.jfr.Frequency

Examples 2

G1GC
G1GC

0.0

29605.16708051163

certificateId

Annotation: jdk.jfr.events.CertificateId

epochmillis

Annotation: jdk.jfr.Timestamp(MILLISECONDS_SINCE_EPOCH)

Examples 3

1702902685041

1702902752832

1702902684442

hertz

Annotation: jdk.jfr.Frequency

Examples 3

79236.12

1000000000

microseconds

17+

Annotation: jdk.jfr.Timespan(MICROSECONDS)

millis

Annotation: jdk.jfr.Timespan(MILLISECONDS)

Examples 3

710643542

714872417

50813634042

nanos

Annotation: jdk.jfr.Timespan(NANOSECONDS)

Examples 3

300000000

-9223372036854775808

29999999

percentage

Annotation: jdk.jfr.Percentage

Examples 3

0.45

0.4736842

0.010674531

tickspan

Annotation: jdk.jfr.Timespan(TICKS)

Examples 3

41765910709

340615000

16873541

tickstamp

Annotation: jdk.jfr.Timestamp(TICKS)

XML Types

Class

No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.


Parameter Type	const Klass*
Field Type	const Klass*
Java Type	java.lang.Class

Examples 3

classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	1057
name	string	java/util/logging/Handler
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.logging
name	string	java.logging
version	string	21.0.1
name	string	java/util/logging

null

ClassLoader

No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.


Parameter Type	const ClassLoaderData*
Field Type	const ClassLoaderData*

Examples 3

name	string	bootstrap
type	Class	null

name	string	bootstrap
type	Class	null

name	string	bootstrap
type	Class	null

Method

No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.


Parameter Type	const Method*
Field Type	const Method*

Examples 3

descriptor	string	(Ljava/lang/String;I)Z
hidden	boolean	false
modifiers	int	1
name	string	startsWith
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/lang/String
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang

descriptor	string	(Ljava/security/CodeSource;)Ljava/security/PermissionCollection;
hidden	boolean	false
modifiers	int	4
name	string	getPermissions
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/security/SecureClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/security

descriptor	string	(Ljava/lang/String;)Ljava/lang/Class;
hidden	boolean	false
modifiers	int	266
name	string	findBootstrapClass
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	1057
name	string	java/lang/ClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang

Module

No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.


Parameter Type	const ModuleEntry*
Field Type	const ModuleEntry*

Examples 3

classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1

classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.logging
name	string	java.logging
version	string	21.0.1

classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1

Package

No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.


Parameter Type	const PackageEntry*
Field Type	const PackageEntry*

Examples 3

exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang

exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.logging
name	string	java.logging
version	string	21.0.1
name	string	java/util/logging

exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/security

StackTrace

15+

No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.


Parameter Type	u8
Field Type	u8
Java Type	jdk.types.StackTrace

Examples 3

frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	199
method	Method
descriptor	string	(Ljava/security/CodeSource;)Ljava/security/PermissionCollection;
hidden	boolean	false
modifiers	int	4
name	string	getPermissions
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/security/SecureClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/security
type	FrameType	Interpreted
		…
truncated	boolean	false

frames	StackFrame
bytecodeIndex	int	301
lineNumber	int	1442
method	Method
descriptor	string	(Ljava/lang/CharSequence;IZ)[Ljava/lang/String;
hidden	boolean	false
modifiers	int	2
name	string	split
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/util/regex/Pattern
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util/regex
type	FrameType	JIT compiled
		…
truncated	boolean	false

frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	(Ljava/lang/String;)Ljava/lang/Class;
hidden	boolean	false
modifiers	int	266
name	string	findBootstrapClass
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	1057
name	string	java/lang/ClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Native
		…
truncated	boolean	false

Thread

No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.


Parameter Type	u8
Field Type	u8
Java Type	java.lang.Thread

Examples 3

group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.default-dispatcher-14
javaThreadId	long	112
osName	string	UCT-akka.actor.default-dispatcher-14
osThreadId	long	86019
virtual	boolean	false

group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.default-dispatcher-20
javaThreadId	long	118
osName	string	UCT-akka.actor.default-dispatcher-20
osThreadId	long	83971
virtual	boolean	false

group	ThreadGroup
name	string	InnocuousThreadGroup
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	Common-Cleaner
javaThreadId	long	18
osName	string	Common-Cleaner
osThreadId	long	24323
virtual	boolean	false

Ticks

unsigned

No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.


Parameter Type	const Ticks&
Field Type	Ticks
Java Type	long
Content Type	tickstamp

Examples 3

36234614500

78193820333

87097143125

Tickspan

unsigned

No description available. Write your own and contribute it to jfreventcollector. or directly to the OpenJDK.


Parameter Type	const Tickspan&
Field Type	Tickspan
Java Type	long
Content Type	tickspan

boolean


Parameter Type	bool
Field Type	bool
Java Type	boolean

Examples 3

true

false

byte


Parameter Type	s1
Field Type	s1
Java Type	byte

char


Parameter Type	char
Field Type	char
Java Type	char

double


Parameter Type	double
Field Type	double
Java Type	double

Examples 3

1.0

25.0

15.0

float


Parameter Type	float
Field Type	float
Java Type	float

Examples 3

5.0481567

5.1425786

2.2677255

int


Parameter Type	s4
Field Type	s4
Java Type	int

Examples 3

1537

1057

266

long


Parameter Type	s8
Field Type	s8
Java Type	long

Examples 3

24323

21922

short


Parameter Type	s2
Field Type	s2
Java Type	short

string


Parameter Type	const char*
Field Type	const char*
Java Type	java.lang.String

Examples 3

java/util/logging/Handler

bootstrap

java/util/logging

ubyte

unsigned


Parameter Type	u1
Field Type	u1
Java Type	byte

Examples 3

uint

unsigned


Parameter Type	unsigned
Field Type	unsigned
Java Type	int

Examples 3

ulong

unsigned


Parameter Type	u8
Field Type	u8
Java Type	long

Examples 3

ushort

unsigned


Parameter Type	u2
Field Type	u2
Java Type	short

Examples 3