Introduction

The following are the events for the OpenJDK 20 (jdk-20.0.2+9, 17-January-2024), and Graal VM 23.0.1 (jdk-20.0.2) . 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 22 23

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 22 23 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 22 23

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	59
flushId	ulong	72
size	ulong: bytes	58530
startTime	long: millis	79385920208

elements	ulong	1589
flushId	ulong	34
size	ulong: bytes	969476
startTime	long: millis	35696077209

elements	ulong	1216
flushId	ulong	58
size	ulong: bytes	342575
startTime	long: millis	61480285208

ActiveRecording

default profiling startTime duration stackTrace 11 17 21 22 23

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.
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
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	22146979917

destination	string	[...]/code/experiments/jfreventcollector/jfr/sample_UseSerialGC.jfr
flushInterval	long: millis	1000
id	long	1
maxAge	long: millis	9223372036854775807
maxSize	long: bytes	0
name	string	1
recordingDuration	long: millis	9223372036854775807
recordingStart	long: epochmillis	1702899981921
stackTrace	StackTrace	null
startTime	long: millis	360834042

destination	string	[...]/code/experiments/jfreventcollector/jfr/sample_UseParallelGC.jfr
flushInterval	long: millis	1000
id	long	1
maxAge	long: millis	9223372036854775807
maxSize	long: bytes	0
name	string	1
recordingDuration	long: millis	9223372036854775807
recordingStart	long: epochmillis	1702899886817
stackTrace	StackTrace	null
startTime	long: millis	416785542

ActiveSetting

default profiling startTime duration stackTrace 11 17 21 22 23

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	46
name	string	stackTrace
stackTrace	StackTrace	null
startTime	long: millis	416785542
value	string	true

id	long	8
name	string	stackTrace
stackTrace	StackTrace	null
startTime	long: millis	360834042
value	string	true

id	long	28
name	string	enabled
stackTrace	StackTrace	null
startTime	long: millis	669832834
value	string	true

JVM

JVMInformation

default profiling startTime duration end of every chunk 11 17 21 22 23 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_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	78940150083

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	75961227292

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	27599379209

InitialSystemProperty

default profiling startTime end of every chunk 11 17 21 22 23 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.info
startTime	long: millis	672946334
value	string	mixed mode

key	string	java.vm.info
startTime	long: millis	75961241583
value	string	mixed mode

key	string	java.class.path
startTime	long: millis	422632500
value	string	[...]/code/experiments/jfreventcollector/.cache/renaissance.jar

JVM: Class Loading

ClassLoad

startTime duration eventThread stackTrace 11 17 21 22 23

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	1057
name	string	java/util/spi/LocaleServiceProvider
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/spi
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	181
method	Method
descriptor	string	(Ljava/util/Locale;)Ljava/text/DecimalFormatSymbols;
hidden	boolean	false
modifiers	int	25
name	string	getInstance
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/text/DecimalFormatSymbols
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/text
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	726106000

definingClassLoader	ClassLoader
name	string	bootstrap
type	Class	null
initiatingClassLoader	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$AppClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	jdk/internal/loader
loadedClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/io/PrintStream
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/io
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	2
lineNumber	int	21
method	Method
descriptor	string	()V
hidden	boolean	false
modifiers	int	8
name	string	<clinit>
type	Class
classLoader	ClassLoader
name	string	app
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	jdk/internal/loader/ClassLoaders$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
hidden	boolean	false
modifiers	int	49
name	string	org/renaissance/core/Launcher
package	Package
exported	boolean	true
module	Module
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
location	string	null
name	string	null
version	string	null
name	string	org/renaissance/core
type	FrameType	Interpreted
truncated	boolean	false
startTime	long: millis	450368208

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	33
name	string	java/util/logging/StreamHandler
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	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	392545708

ClassDefine

startTime eventThread stackTrace 11 17 21 22 23

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	32
name	string	java/util/ServiceLoader$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/util
definingClassLoader	ClassLoader
name	string	bootstrap
type	Class	null
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	662
method	Method
descriptor	string	(Ljava/lang/Class;)Ljava/lang/reflect/Constructor;
hidden	boolean	false
modifiers	int	2
name	string	getConstructor
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/util/ServiceLoader
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	Interpreted
		…
truncated	boolean	false
startTime	long: millis	402139667

definedClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	jdk/jfr/internal/Bits
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/jdk.jfr
name	string	jdk.jfr
version	string	21.0.1
name	string	jdk/jfr/internal
definingClassLoader	ClassLoader
name	string	bootstrap
type	Class	null
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	53
lineNumber	int	270
method	Method
descriptor	string	()Z
hidden	boolean	false
modifiers	int	1
name	string	endEvent
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	jdk/jfr/internal/event/EventWriter
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/jdk.jfr
name	string	jdk.jfr
version	string	21.0.1
name	string	jdk/jfr/internal/event
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	693280375

definedClass	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
definingClassLoader	ClassLoader
name	string	bootstrap
type	Class	null
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	448163333

ClassRedefinition

default profiling startTime 15 17 21 22 23

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 22 23

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 22 23

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 22 23

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	4558844792
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	33
name	string	org/sparkproject/guava/collect/ImmutableMap$Builder
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
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	3889571500
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	1537
name	string	org/slf4j/Logger
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

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	5993877334
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	1537
name	string	scala/collection/immutable/SortedSet
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

JVM: Code Cache

CodeCacheFull

default profiling startTime eventThread 11 17 21 22 23

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 22 23

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	0
codeBlobType	CodeBlobType	CodeHeap 'non-profiled nmethods'
entryCount	int	4894
fullCount	int	0
methodCount	int	4894
reservedTopAddress	ulong: address	4733009920
startAddress	ulong: address	4610097152
startTime	long: millis	75962737250
unallocatedCapacity	ulong: bytes	112391680

adaptorCount	int	0
codeBlobType	CodeBlobType	CodeHeap 'non-profiled nmethods'
entryCount	int	5266
fullCount	int	0
methodCount	int	5266
reservedTopAddress	ulong: address	4771921920
startAddress	ulong: address	4649009152
startTime	long: millis	58628386625
unallocatedCapacity	ulong: bytes	110473088

adaptorCount	int	0
codeBlobType	CodeBlobType	CodeHeap 'non-profiled nmethods'
entryCount	int	2753
fullCount	int	0
methodCount	int	2753
reservedTopAddress	ulong: address	5217714176
startAddress	ulong: address	5094801408
startTime	long: millis	78960106083
unallocatedCapacity	ulong: bytes	118691456

CodeCacheConfiguration

default profiling startTime end of every chunk 11 17 21 22 23

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	4771921920
startAddress	ulong: address	4520263680
startTime	long: millis	58734928042

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	93747386417

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	52082148542

JVM: Compiler

JITRestart

default profiling startTime eventThread 17 21 22 23

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 22 23

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	uint	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	1464
compileId	uint	31457
compileLevel	ushort	3
compiler	CompilerType	c1
inlinedBytes	ulong: bytes	59
isOsr	boolean	false
method	Method
descriptor	string	(I)V
hidden	boolean	false
modifiers	int	16
name	string	reuse
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	1056
name	string	io/netty/buffer/PooledByteBuf
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
startTime	long: millis	78960110375
succeded	boolean	true

codeSize	ulong: bytes	25888
compileId	uint	2623
compileLevel	ushort	4
compiler	CompilerType	c2
inlinedBytes	ulong: bytes	2594
isOsr	boolean	false
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
startTime	long: millis	1528979334
succeded	boolean	true

codeSize	ulong: bytes	27344
compileId	uint	2922
compileLevel	ushort	4
compiler	CompilerType	c2
inlinedBytes	ulong: bytes	6452
isOsr	boolean	false
method	Method
descriptor	string	(Ljava/lang/Object;Ljava/lang/Object;)V
hidden	boolean	true
modifiers	int	1
name	string	accept
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	true
modifiers	int	4144
name	string	java.util.stream.Collectors$$Lambda+0x000000080024c688/1376017854
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/stream
startTime	long: millis	1488228292
succeded	boolean	true

CompilerPhase

default profiling startTime duration eventThread 11 17 21 22 23

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	uint	Compilation Identifier
phaseLevel	ushort	Phase Level

CompilationFailure

profiling startTime eventThread 11 17 21 22 23

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	uint	Compilation Identifier

Examples 3

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

compileId	uint	23630
failureMessage	string	concurrent class loading
startTime	long: millis	58021071125

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

CompilerInlining

startTime eventThread 11 17 21 22 23

Category: Java Virtual Machine / Compiler / Optimization

Describes the result of a method inlining attempt

Configuration	enabled
default	false
profiling	false

Field	Type	Description
compileId	uint	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	uint	1448
message	string	callee is too large
startTime	long: millis	415536542
succeeded	boolean	false

bci	int	43
callee	CalleeMethod
descriptor	string	(I)C
name	string	charAt
type	string	java/lang/String
caller	Method
descriptor	string	(Ljava/lang/String;)V
hidden	boolean	false
modifiers	int	2
name	string	putStringValue
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	jdk/jfr/internal/event/EventWriter
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/jdk.jfr
name	string	jdk.jfr
version	string	21.0.1
name	string	jdk/jfr/internal/event
compileId	uint	1497
message	string	inline
startTime	long: millis	671543709
succeeded	boolean	true

bci	int	116
callee	CalleeMethod
descriptor	string	(B)V
name	string	putUncheckedByte
type	string	jdk/jfr/internal/event/EventWriter
caller	Method
descriptor	string	(J)V
hidden	boolean	false
modifiers	int	2
name	string	putUncheckedLong
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	jdk/jfr/internal/event/EventWriter
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/jdk.jfr
name	string	jdk.jfr
version	string	21.0.1
name	string	jdk/jfr/internal/event
compileId	uint	1446
message	string	callee uses too much stack
startTime	long: millis	361738542
succeeded	boolean	false

Deoptimization

default profiling startTime eventThread stackTrace 14 17 21 22 23

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	uint	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	maybe_recompile
bci	int	19
compileId	uint	3457
compiler	CompilerType	c2
instruction	Bytecode	if_icmpge
lineNumber	int	285
method	Method
descriptor	string	(Ljava/nio/ByteBuffer;ILjava/lang/String;I)I
hidden	boolean	false
modifiers	int	8
name	string	stringFromByteBufferMatches
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	jdk/internal/jimage/ImageStringsReader
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/jimage
reason	DeoptimizationReason	profile_predicate
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	19
lineNumber	int	285
method	Method
descriptor	string	(Ljava/nio/ByteBuffer;ILjava/lang/String;I)I
hidden	boolean	false
modifiers	int	8
name	string	stringFromByteBufferMatches
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	jdk/internal/jimage/ImageStringsReader
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/jimage
type	FrameType	Inlined
		…
truncated	boolean	false
startTime	long: millis	3122633667

action	DeoptimizationAction	reinterpret
bci	int	8
compileId	uint	2653
compiler	CompilerType	c2
instruction	Bytecode	if_icmpne
lineNumber	int	3335
method	Method
descriptor	string	(Ljava/lang/String;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/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
reason	DeoptimizationReason	unstable_if
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	8
lineNumber	int	3335
method	Method
descriptor	string	(Ljava/lang/String;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/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	JIT compiled
		…
truncated	boolean	false
startTime	long: millis	5549208334

action	DeoptimizationAction	reinterpret
bci	int	13
compileId	uint	3181
compiler	CompilerType	c2
instruction	Bytecode	ifnonnull
lineNumber	int	592
method	Method
descriptor	string	(Ljava/lang/Object;Ljava/util/function/Function;)Ljava/lang/Object;
hidden	boolean	false
modifiers	int	1
name	string	computeIfAbsent
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/util/TreeMap
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	13
lineNumber	int	592
method	Method
descriptor	string	(Ljava/lang/Object;Ljava/util/function/Function;)Ljava/lang/Object;
hidden	boolean	false
modifiers	int	1
name	string	computeIfAbsent
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/util/TreeMap
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	1736890875

CompilerStatistics

default profiling startTime every chunk 11 17 21 22 23

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	3
compileCount	int	6344
invalidatedCount	int	0
nmethodCodeSize	ulong: bytes	7367968
nmethodsSize	ulong: bytes	11786568
osrBytesCompiled	ulong: bytes	0
osrCompileCount	int	75
peakTimeSpent	long: millis	953
standardBytesCompiled	ulong: bytes	0
standardCompileCount	int	6269
startTime	long: millis	15709518458
totalTimeSpent	long: millis	14100

bailoutCount	int	2
compileCount	int	19631
invalidatedCount	int	0
nmethodCodeSize	ulong: bytes	23379576
nmethodsSize	ulong: bytes	36711528
osrBytesCompiled	ulong: bytes	0
osrCompileCount	int	181
peakTimeSpent	long: millis	1360
standardBytesCompiled	ulong: bytes	0
standardCompileCount	int	19450
startTime	long: millis	80386735208
totalTimeSpent	long: millis	64291

bailoutCount	int	5
compileCount	int	34041
invalidatedCount	int	0
nmethodCodeSize	ulong: bytes	49513448
nmethodsSize	ulong: bytes	73754904
osrBytesCompiled	ulong: bytes	0
osrCompileCount	int	235
peakTimeSpent	long: millis	1103
standardBytesCompiled	ulong: bytes	0
standardCompileCount	int	33806
startTime	long: millis	67196766875
totalTimeSpent	long: millis	83767

CompilerConfiguration

default profiling startTime end of every chunk 11 17 21 22 23

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	84416222667
threadCount	int	4
tieredCompilation	boolean	true

dynamicCompilerThreadCount	boolean	true
startTime	long: millis	676032042
threadCount	int	4
tieredCompilation	boolean	true

dynamicCompilerThreadCount	boolean	true
startTime	long: millis	17899841333
threadCount	int	4
tieredCompilation	boolean	true

JVM: Diagnostics

SyncOnValueBasedClass

experimental default profiling startTime eventThread stackTrace 16 17 21 22 23

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 22 23

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	threshold
default	true	true	0 ns
profiling	true	true	0 ns

Field	Type	Description
destination	string	Destination
size	long	Size
gcBeforeDump	boolean	GC Before Dump
onOutOfMemoryError	boolean	On Out of Memory Error

JVM: Flag

IntFlagChanged

default profiling startTime 11 17 21 22 23

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 22 23

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 22 23

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 22 23

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 22 23

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 22 23

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 22 23

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 22 23

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	VMThreadPriority
origin	FlagValueOrigin	Default
startTime	long: millis	423302708
value	int	-1

name	string	CompilerThreadPriority
origin	FlagValueOrigin	Default
startTime	long: millis	676045084
value	int	-1

name	string	UnguardOnExecutionViolation
origin	FlagValueOrigin	Default
startTime	long: millis	30519912292
value	int	0

UnsignedIntFlag

default profiling startTime duration end of every chunk 11 17 21 22 23

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	UseSVE
origin	FlagValueOrigin	Default
startTime	long: millis	676051375
value	uint	0

name	string	G1RefProcDrainInterval
origin	FlagValueOrigin	Default
startTime	long: millis	423306833
value	uint	1000

name	string	VerifyIterativeGVN
origin	FlagValueOrigin	Default
startTime	long: millis	75962743667
value	uint	0

LongFlag

default profiling startTime duration end of every chunk 11 17 21 22 23

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	BCEATraceLevel
origin	FlagValueOrigin	Default
startTime	long: millis	423476000
value	long	0

name	string	Tier0InvokeNotifyFreqLog
origin	FlagValueOrigin	Default
startTime	long: millis	364810333
value	long	7

name	string	CIStop
origin	FlagValueOrigin	Default
startTime	long: millis	676084292
value	long	2147483647

UnsignedLongFlag

default profiling startTime duration end of every chunk 11 17 21 22 23

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	CompressedClassSpaceSize
origin	FlagValueOrigin	Default
startTime	long: millis	676125042
value	ulong	1073741824

name	string	LoopStripMiningIterShortLoop
origin	FlagValueOrigin	Default
startTime	long: millis	364819542
value	ulong	0

name	string	LoopStripMiningIterShortLoop
origin	FlagValueOrigin	Default
startTime	long: millis	423575958
value	ulong	0

DoubleFlag

default profiling startTime duration end of every chunk 11 17 21 22 23

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	MaxRAMPercentage
origin	FlagValueOrigin	Default
startTime	long: millis	30519947417
value	double	25.0

name	string	ZFragmentationLimit
origin	FlagValueOrigin	Default
startTime	long: millis	50917432584
value	double	0.0

name	string	G1ConcMarkStepDurationMillis
origin	FlagValueOrigin	Default
startTime	long: millis	17899884625
value	double	10.0

BooleanFlag

default profiling startTime duration end of every chunk 11 17 21 22 23

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	RecordDynamicDumpInfo
origin	FlagValueOrigin	Default
startTime	long: millis	364837667
value	boolean	false

name	string	ImplicitDiv0Checks
origin	FlagValueOrigin	Default
startTime	long: millis	423599417
value	boolean	true

name	string	CanonicalizeNodes
origin	FlagValueOrigin	Default
startTime	long: millis	676155334
value	boolean	true

StringFlag

default profiling startTime duration end of every chunk 11 17 21 22 23

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	SharedArchiveFile
origin	FlagValueOrigin	Default
startTime	long: millis	676238292
value	string	null

name	string	DumpLoadedClassList
origin	FlagValueOrigin	Default
startTime	long: millis	30519985250
value	string	null

name	string	ShenandoahGCMode
origin	FlagValueOrigin	Default
startTime	long: millis	17899932083
value	string	satb

JVM: GC: Collector

GarbageCollection

default profiling startTime duration 11 17 21 22 23 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	G1 Evacuation Pause
gcId	uint	87
longestPause	Tickspan	4009417
name	GCName	G1New
startTime	long: millis	30486050750
sumOfPauses	Tickspan	4009417

cause	GCCause	Allocation Failure
gcId	uint	83
longestPause	Tickspan	2310459
name	GCName	ParallelScavenge
startTime	long: millis	61468069708
sumOfPauses	Tickspan	2310459

cause	GCCause	Allocation Failure
gcId	uint	62
longestPause	Tickspan	30957333
name	GCName	DefNew
startTime	long: millis	7029852042
sumOfPauses	Tickspan	30957333

SystemGC

default profiling startTime duration eventThread stackTrace 17 21 22 23

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	45189866000

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	70264989750

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	1959824250

ParallelOldGarbageCollection

default profiling startTime duration 11 17 21 22 23

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	30065819648
gcId	uint	80
startTime	long: millis	60479174417

YoungGarbageCollection

default profiling startTime duration 11 17 21 22 23

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	81
startTime	long: millis	12475301917
tenuringThreshold	uint	1

gcId	uint	8
startTime	long: millis	1335263917
tenuringThreshold	uint	5

gcId	uint	117
startTime	long: millis	40559086167
tenuringThreshold	uint	1

OldGarbageCollection

default profiling startTime duration 11 17 21 22 23

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	179
startTime	long: millis	53651638959

gcId	uint	106
startTime	long: millis	74893885500

gcId	uint	286
startTime	long: millis	64096175375

G1GarbageCollection

default profiling startTime duration 11 17 21 22 23

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	9
startTime	long: millis	1605757334
type	G1YCType	Mixed

JVM: GC: Configuration

GCConfiguration

default profiling startTime duration end of every chunk 11 17 21 22 23

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	0
gcTimeRatio	uint	99
isExplicitGCConcurrent	boolean	false
isExplicitGCDisabled	boolean	false
oldCollector	GCName	ParallelOld
parallelGCThreads	uint	8
pauseTarget	long: millis	-9223372036854775808
startTime	long: millis	93887419417
usesDynamicGCThreads	boolean	true
youngCollector	GCName	ParallelScavenge

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	40220266167
usesDynamicGCThreads	boolean	true
youngCollector	GCName	DefNew

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	62760429292
usesDynamicGCThreads	boolean	true
youngCollector	GCName	G1New

GCSurvivorConfiguration

default profiling startTime duration end of every chunk 11 17 21 22 23

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	84639716125

initialTenuringThreshold	ubyte	7
maxTenuringThreshold	ubyte	15
startTime	long: millis	13055582000

initialTenuringThreshold	ubyte	7
maxTenuringThreshold	ubyte	15
startTime	long: millis	436495750

GCTLABConfiguration

default profiling startTime duration end of every chunk 11 17 21 22 23

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	692409084
tlabRefillWasteLimit	ulong: bytes	64
usesTLABs	boolean	true

minTLABSize	ulong: bytes	2048
startTime	long: millis	18250636333
tlabRefillWasteLimit	ulong: bytes	64
usesTLABs	boolean	true

minTLABSize	ulong: bytes	2048
startTime	long: millis	76136302208
tlabRefillWasteLimit	ulong: bytes	64
usesTLABs	boolean	true

GCHeapConfiguration

default profiling startTime duration end of every chunk 11 17 21 22 23

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	30690534667
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	50973331334
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 22 23

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	1431633920
minSize	ulong: bytes	89456640
newRatio	uint	2
startTime	long: millis	84639718000

maxSize	ulong: bytes	2575302656
minSize	ulong: bytes	1363144
newRatio	uint	2
startTime	long: millis	63145625959

maxSize	ulong: bytes	1431306240
minSize	ulong: bytes	89128960
newRatio	uint	2
startTime	long: millis	60476335250

JVM: GC: Detailed

ZThreadDebug

internal startTime duration eventThread 18 21 22 23

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 22 23

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	111
gcTime	long: millis	7
pauseTarget	long: millis	200
startTime	long: millis	39732798417
timeSlice	long: millis	201

EvacuationInformation

default profiling startTime 11 17 21 22 23

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	2
allocationRegionsUsedAfter	ulong: bytes	4109984
allocationRegionsUsedBefore	ulong: bytes	0
bytesCopied	ulong: bytes	4109984
cSetRegions	uint	182
cSetUsedAfter	ulong: bytes	0
cSetUsedBefore	ulong: bytes	379684744
gcId	uint	58
regionsFreed	uint	182
startTime	long: millis	21580801417

ObjectCountAfterGC

startTime 11 17 21 22 23

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	248005
gcId	uint	22
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/Props
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	9266401125
totalSize	ulong: bytes	7936160

count	long	73103
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/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	8979422834
totalSize	ulong: bytes	6433064

count	long	5794
gcId	uint	1
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/util/jar/Attributes
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/jar
startTime	long: millis	865943958
totalSize	ulong: bytes	92704

G1EvacuationYoungStatistics

default profiling startTime 11 17 21 22 23

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	2403925792
statistics	G1EvacuationStatistics
allocated	ulong: bytes	9071808
directAllocated	ulong: bytes	0
failureUsed	ulong: bytes	0
failureWaste	ulong: bytes	0
gcId	uint	18
numDirectAllocated	ulong	5
numPlabsFilled	ulong	7504122885671534260
regionEndWaste	ulong: bytes	0
regionsRefilled	uint	5
undoWaste	ulong: bytes	0
used	ulong: bytes	8165816
wasted	ulong: bytes	36248

G1EvacuationOldStatistics

default profiling startTime 11 17 21 22 23

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	29272278209
statistics	G1EvacuationStatistics
allocated	ulong: bytes	0
directAllocated	ulong: bytes	0
failureUsed	ulong: bytes	0
failureWaste	ulong: bytes	0
gcId	uint	84
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 22 23

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	5115728
gcId	uint	2
lastMarkingDuration	long: millis	0
recentAllocationRate	double: bytes-per-second	186228.25959883735
recentMutatorAllocationSize	ulong: bytes	41280
recentMutatorDuration	long: millis	221
startTime	long: millis	914794709
targetOccupancy	ulong: bytes	14680064
threshold	ulong: bytes	6606028
thresholdPercentage	float: percentage	0.44999996

G1AdaptiveIHOP

default profiling startTime 11 17 21 22 23

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	106954752
currentOccupancy	ulong: bytes	519377608
gcId	uint	117
ihopTargetOccupancy	ulong: bytes	693318451
predictedAllocationRate	double: bytes-per-second	6.178758485430387E8
predictedMarkingDuration	long: millis	338
predictionActive	boolean	false
startTime	long: millis	40597543834
threshold	ulong: bytes	328414003
thresholdPercentage	float: percentage	0.47368422

PromoteObjectInNewPLAB

profiling startTime eventThread 11 17 21 22 23

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

ParallelGC
G1GC

gcId	uint	5
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	0
name	string	[B
package	Package	null
objectSize	ulong: bytes	24
plabSize	ulong: bytes	8176
startTime	long: millis	1163942375
tenured	boolean	true
tenuringAge	uint	1

gcId	uint	4
objectClass	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
objectSize	ulong: bytes	16
plabSize	ulong: bytes	56672
startTime	long: millis	977531292
tenured	boolean	false
tenuringAge	uint	0

PromoteObjectOutsidePLAB

profiling startTime eventThread 11 17 21 22 23

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	13
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	21064
startTime	long: millis	2074127917
tenured	boolean	false
tenuringAge	uint	0

gcId	uint	58
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	50120
startTime	long: millis	21580021209
tenured	boolean	false
tenuringAge	uint	0

PromotionFailed

default profiling startTime 11 17 21 22 23

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 22 23

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 22 23

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 20 21 22 23

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	39
realTime	ulong: nanos	0
startTime	long: millis	4308227542
systemTime	ulong: nanos	0
userTime	ulong: nanos	0

gcId	uint	49
realTime	ulong: nanos	90000152
startTime	long: millis	16020848917
systemTime	ulong: nanos	30000000
userTime	ulong: nanos	500000000

gcId	uint	60
realTime	ulong: nanos	99999904
startTime	long: millis	39145505542
systemTime	ulong: nanos	0
userTime	ulong: nanos	510000000

AllocationRequiringGC

startTime eventThread stackTrace 11 17 21 22 23

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	25
size	ulong: bytes	32
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	51
lineNumber	int	691
method	Method
descriptor	string	(Lscala/collection/immutable/RedBlackTree$Tree;)Lscala/collection/immutable/RedBlackTree$Tree;
hidden	boolean	false
modifiers	int	1
name	string	withRight
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/RedBlackTree$Tree
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	14717593833

gcId	uint	93
size	ulong: bytes	2048
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	12
lineNumber	int	359
method	Method
descriptor	string	(Lscala/Function1;)Lcom/twitter/util/Future;
hidden	boolean	false
modifiers	int	1
name	string	transformTry
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	com/twitter/util/Promise$Responder
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/util
type	FrameType	Inlined
		…
truncated	boolean	false
startTime	long: millis	32679262959

gcId	uint	57
size	ulong: bytes	120
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	5
lineNumber	int	87
method	Method
descriptor	string	(I)Lio/jenetics/internal/collection/ObjectStore;
hidden	boolean	false
modifiers	int	9
name	string	ofLength
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	io/jenetics/internal/collection/ObjectStore
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/jenetics/internal/collection
type	FrameType	Inlined
		…
truncated	boolean	false
startTime	long: millis	5780913250

TenuringDistribution

default profiling startTime 11 17 21 22 23

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

SerialGC
G1GC

age	uint	14
gcId	uint	17
size	ulong: bytes	0
startTime	long: millis	1795047833

age	uint	14
gcId	uint	4
size	ulong: bytes	0
startTime	long: millis	977805917

G1HeapRegionTypeChange

startTime 11 17 21 22 23

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	Free
index	uint	23
start	ulong: address	30113005568
startTime	long: millis	690146000
to	G1HeapRegionType	Free
used	ulong: bytes	0

ObjectCount

startTime every chunk 11 17 21 22 23

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	959
gcId	uint	8
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
startTime	long: millis	1360118500
totalSize	ulong: bytes	3641984

count	long	10523
gcId	uint	1
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	0
name	string	[B
package	Package	null
startTime	long: millis	431274583
totalSize	ulong: bytes	808352

count	long	1533962
gcId	uint	43
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	0
name	string	[B
package	Package	null
startTime	long: millis	12692291459
totalSize	ulong: bytes	40985464

G1HeapRegionInformation

startTime duration every chunk 11 17 21 22 23

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	5
start	ulong: address	30075256832
startTime	long: millis	692349334
type	G1HeapRegionType	Free
used	ulong: bytes	0

ZAllocationStall

default profiling startTime duration eventThread 15 17 21 22 23

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	12626236958
type	ZPageTypeType	Small

ZPageAllocation

default profiling startTime duration eventThread stackTrace 11 17 21 22 23

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	false
segments	uint	1
size	ulong: bytes	2097152
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	114
lineNumber	int	156
method	Method
descriptor	string	(Lscala/collection/IterableOnce;)Lscala/collection/immutable/List;
hidden	boolean	false
modifiers	int	1
name	string	prependedAll
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	1057
name	string	scala/collection/immutable/List
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	JIT compiled
		…
truncated	boolean	false
startTime	long: millis	11682949416
type	ZPageTypeType	Small

ZRelocationSet

default profiling startTime duration eventThread 15 17 21 22 23

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	234881024
relocate	ulong: bytes	99365472
startTime	long: millis	34830665416
total	ulong: bytes	729808896

ZRelocationSetGroup

default profiling startTime duration eventThread 15 17 21 22 23

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.
pages	ulong 17 until JDK 21	Pages
total	ulong: bytes	Total
empty	ulong: bytes	Empty
relocate	ulong: bytes 16+	Relocate

Examples 1

empty	ulong: bytes	1495269376
relocate	ulong: bytes	5158896
startTime	long: millis	38584830250
total	ulong: bytes	1742733312
type	ZPageTypeType	Small

ZStatisticsCounter

experimental startTime duration eventThread 11 17 21 22 23

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	Allocation Rate
increment	ulong	6291456
startTime	long: millis	1108875500
value	ulong	111149056

ZStatisticsSampler

experimental startTime duration eventThread 11 17 21 22 23

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 References Enqueue
startTime	long: millis	753303958
value	ulong	1958

ZThreadPhase

experimental startTime duration eventThread 11 17 21 22 23

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	1
name	string	Concurrent Weak Roots OopStorageSet
startTime	long: millis	751873166

ZUncommit

default profiling startTime duration eventThread 15 17 21 22 23

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 22 23

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	1559230500
unmapped	ulong: bytes	2097152

ShenandoahHeapRegionStateChange

startTime 11 17 21 22 23

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	Regular
index	uint	1
start	ulong: address	30066868224
startTime	long: millis	805900833
to	ShenandoahHeapRegionState	Collection Set
used	ulong: bytes	2097152

ShenandoahHeapRegionInformation

startTime duration every chunk 11 17 21 22 23

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	29
start	ulong: address	30125588480
startTime	long: millis	363234375
state	ShenandoahHeapRegionState	Empty Committed
used	ulong: bytes	0

GCLocker

default profiling startTime eventThread stackTrace 17 21 22 23

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 22 23

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	22
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	171997808
startTime	long: millis	1859720292
when	GCWhen	Before GC

gcId	uint	47
heapSpace	VirtualSpace
committedEnd	ulong: address	32287752192
committedSize	ulong: bytes	2222981120
reservedEnd	ulong: address	34359738368
reservedSize	ulong: bytes	4294967296
start	ulong: address	30064771072
heapUsed	ulong: bytes	453870768
startTime	long: millis	14861476417
when	GCWhen	After GC

gcId	uint	11
heapSpace	VirtualSpace
committedEnd	ulong: address	30553407488
committedSize	ulong: bytes	488636416
reservedEnd	ulong: address	34359738368
reservedSize	ulong: bytes	4294967296
start	ulong: address	30064771072
heapUsed	ulong: bytes	351455400
startTime	long: millis	1870107625
when	GCWhen	Before GC

MetaspaceSummary

default profiling startTime 11 17 21 22 23

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	3473408
reserved	ulong: bytes	1073741824
used	ulong: bytes	3355320
dataSpace	MetaspaceSizes
committed	ulong: bytes	27066368
reserved	ulong: bytes	67108864
used	ulong: bytes	26910064
gcId	uint	20
gcThreshold	ulong: bytes	43057152
metaspace	MetaspaceSizes
committed	ulong: bytes	30539776
reserved	ulong: bytes	1140850688
used	ulong: bytes	30265384
startTime	long: millis	6765281958
when	GCWhen	Before GC

classSpace	MetaspaceSizes
committed	ulong: bytes	2621440
reserved	ulong: bytes	1073741824
used	ulong: bytes	2509072
dataSpace	MetaspaceSizes
committed	ulong: bytes	21168128
reserved	ulong: bytes	67108864
used	ulong: bytes	20977808
gcId	uint	27
gcThreshold	ulong: bytes	38338560
metaspace	MetaspaceSizes
committed	ulong: bytes	23789568
reserved	ulong: bytes	1140850688
used	ulong: bytes	23486880
startTime	long: millis	1927834917
when	GCWhen	After GC

classSpace	MetaspaceSizes
committed	ulong: bytes	1507328
reserved	ulong: bytes	1073741824
used	ulong: bytes	1446448
dataSpace	MetaspaceSizes
committed	ulong: bytes	14483456
reserved	ulong: bytes	67108864
used	ulong: bytes	14415168
gcId	uint	3
gcThreshold	ulong: bytes	22020096
metaspace	MetaspaceSizes
committed	ulong: bytes	15990784
reserved	ulong: bytes	1140850688
used	ulong: bytes	15861616
startTime	long: millis	939347250
when	GCWhen	Before GC

PSHeapSummary

default profiling startTime 11 17 21 22 23

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	33196867584
size	ulong: bytes	268435456
start	ulong: address	32928432128
used	ulong: bytes	0
fromSpace	ObjectSpace
end	ulong: address	33234092032
size	ulong: bytes	37224448
start	ulong: address	33196867584
used	ulong: bytes	0
gcId	uint	9
oldObjectSpace	ObjectSpace
end	ulong: address	30244077568
size	ulong: bytes	179306496
start	ulong: address	30064771072
used	ulong: bytes	79145128
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	1497605750
toSpace	ObjectSpace
end	ulong: address	33279705088
size	ulong: bytes	41418752
start	ulong: address	33238286336
used	ulong: bytes	0
when	GCWhen	After GC
youngSpace	VirtualSpace
committedEnd	ulong: address	33279705088
committedSize	ulong: bytes	351272960
reservedEnd	ulong: address	34359738368
reservedSize	ulong: bytes	1431306240
start	ulong: address	32928432128

G1HeapSummary

default profiling startTime 11 17 21 22 23

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
numberOfRegions	uint	Number of Regions

Examples 1

G1GC

edenTotalSize	ulong: bytes	408944640
edenUsedSize	ulong: bytes	0
gcId	uint	35
numberOfRegions	uint	407
startTime	long: millis	9095929834
survivorUsedSize	ulong: bytes	41943040
when	GCWhen	After GC

JVM: GC: Metaspace

MetaspaceGCThreshold

default profiling startTime 11 17 21 22 23

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	42729472
oldValue	ulong: bytes	38469632
startTime	long: millis	6122275834
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	198180864
oldValue	ulong: bytes	197722112
startTime	long: millis	99247749500
updater	GCThresholdUpdater	compute_new_size

MetaspaceAllocationFailure

default profiling startTime stackTrace 11 17 21 22 23

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 22 23

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 22 23

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	3
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	986252542
when	GCWhen	After GC

gcId	uint	19
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	2471711792
when	GCWhen	After GC

gcId	uint	3
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	1060630958
when	GCWhen	Before GC

JVM: GC: Phases

GCPhasePause

default profiling startTime duration eventThread 11 17 21 22 23 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	93
name	string	GC Pause
startTime	long: millis	15033490292

gcId	uint	13
name	string	GC Pause
startTime	long: millis	2072697250

gcId	uint	7
name	string	Pause Cleanup
startTime	long: millis	1449405750

GCPhasePauseLevel1

default profiling startTime duration eventThread 11 17 21 22 23 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	20
name	string	Notify and keep alive finalizable
startTime	long: millis	1837429125

gcId	uint	5
name	string	Notify PhantomReferences
startTime	long: millis	1005294917

gcId	uint	9
name	string	Summary Phase
startTime	long: millis	1441519042

GCPhasePauseLevel2

default profiling startTime duration eventThread 11 17 21 22 23 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	55
name	string	Phase 1: Reference Processing
startTime	long: millis	21128026917

gcId	uint	12
name	string	Notify PhantomReferences
startTime	long: millis	2010760958

gcId	uint	93
name	string	Report Object Count
startTime	long: millis	15266702000

GCPhasePauseLevel3

startTime duration eventThread 11 17 21 22 23 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	159
name	string	Notify and keep alive finalizable
startTime	long: millis	50845770584

gcId	uint	28
name	string	Notify Soft/WeakReferences
startTime	long: millis	17307466458

gcId	uint	8
name	string	Notify PhantomReferences
startTime	long: millis	1333295292

GCPhasePauseLevel4

startTime duration eventThread 11 17 21 22 23 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	38
name	string	Balance queues
startTime	long: millis	23008675833

gcId	uint	80
name	string	Balance queues
startTime	long: millis	26297171125

GCPhaseConcurrent

default profiling startTime duration eventThread 11 17 21 22 23

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 weak roots
startTime	long: millis	4564775917

gcId	uint	13
name	string	Concurrent Relocate
startTime	long: millis	20346251416

gcId	uint	168
name	string	Concurrent Clear Claimed Marks
startTime	long: millis	52547940334

GCPhaseConcurrentLevel1

default profiling startTime duration eventThread 15 17 21 22 23

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	45
name	string	Trigger cleanups
startTime	long: millis	66100996708

gcId	uint	30
name	string	ClassLoaderData
startTime	long: millis	47252171458

gcId	uint	206
name	string	Preclean PhantomReferences
startTime	long: millis	60045109000

GCPhaseParallel

default profiling startTime duration eventThread 12 17 21 22 23

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

ShenandoahGC
G1GC

gcId	uint	2
gcWorkerId	uint	3
name	string	Finish Mark
startTime	long: millis	2588734750

gcId	uint	4
gcWorkerId	uint	0
name	string	CodeRoots
startTime	long: millis	977569125

JVM: GC: Reference

GCReferenceStatistics

default profiling startTime 11 17 21 22 23

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	131
gcId	uint	0
startTime	long: millis	366987583
type	ReferenceType	Weak reference

count	ulong	3
gcId	uint	5
startTime	long: millis	1005301042
type	ReferenceType	Weak reference

count	ulong	0
gcId	uint	17
startTime	long: millis	5544419542
type	ReferenceType	Soft reference

JVM: Internal

Duration

internal startTime duration eventThread 18 21 22 23

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 22 23

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 22 23

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 22 23

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

NativeMemoryUsage

default profiling startTime duration every chunk 20 21 22 23

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	string	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 22 23

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 22 23

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 -1 if it is not an array
root	OldObjectGcRoot	GC Root Consider contributing a description to jfreventcollector.

Examples 3

allocationTime	Ticks	38915936000
arrayElements	int	-2147483648
lastKnownHeapUsage	ulong: bytes	89389008
object	OldObject
address	ulong: address	31586402872
description	string	Class Name: com.twitter.finagle.ClientConnection$
referrer	Reference	null
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
objectAge	Tickspan	60052061708
objectSize	ulong: bytes	120
root	OldObjectGcRoot	null
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	98967997708

allocationTime	Ticks	75090663667
arrayElements	int	-2147483648
lastKnownHeapUsage	ulong: bytes	121266640
object	OldObject
address	ulong: address	30191246872
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/locks/AbstractQueuedSynchronizer$ConditionNode
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util/concurrent/locks
objectAge	Tickspan	2909861542
objectSize	ulong: bytes	32
root	OldObjectGcRoot	null
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	10
lineNumber	int	1622
method	Method
descriptor	string	()Ljava/util/concurrent/locks/AbstractQueuedSynchronizer$ConditionNode;
hidden	boolean	false
modifiers	int	2
name	string	newConditionNode
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/util/concurrent/locks/AbstractQueuedSynchronizer$ConditionObject
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/locks
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	78000525209

allocationTime	Ticks	78464179792
arrayElements	int	64
lastKnownHeapUsage	ulong: bytes	121406312
object	OldObject
address	ulong: address	30171713208
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	15602730458
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	94066910250

ExecutionSample

default profiling startTime every chunk 11 17 21 22 23 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	ForkJoinPool.commonPool-worker-3
javaThreadId	long	33
osName	string	ForkJoinPool.commonPool-worker-3
osThreadId	long	26627
virtual	boolean	false
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	12
lineNumber	int	50
method	Method
descriptor	string	()Ljava/lang/Object;
hidden	boolean	false
modifiers	int	0
name	string	get
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	48
name	string	io/jenetics/util/Context
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/jenetics/util
type	FrameType	Inlined
		…
truncated	boolean	false
startTime	long: millis	4965796125
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	ForkJoinPool.commonPool-worker-7
javaThreadId	long	29
osName	string	ForkJoinPool.commonPool-worker-7
osThreadId	long	29699
virtual	boolean	false
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	46
lineNumber	int	58
method	Method
descriptor	string	()Ljava/lang/Object;
hidden	boolean	false
modifiers	int	1
name	string	next
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	io/jenetics/internal/collection/BaseSeqIterator
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/jenetics/internal/collection
type	FrameType	Inlined
		…
truncated	boolean	false
startTime	long: millis	4132008833
state	ThreadState	STATE_RUNNABLE

NativeMethodSample

default profiling startTime every chunk 11 17 21 22 23 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	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	3056386250
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	(JI)V
hidden	boolean	false
modifiers	int	266
name	string	mkdir0
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	sun/nio/fs/UnixNativeDispatcher
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/fs
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	4298102833
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	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	3387728667
state	ThreadState	STATE_RUNNABLE

JVM: Runtime

ContinuationFreeze

experimental startTime duration eventThread stackTrace 19 21 22 23

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 22 23

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 22 23

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 22 23

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 22 23

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 22 23

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 22 23

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 22 23 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	36
startTime	long: millis	1832275083
totalThreadCount	int	21

jniCriticalThreadCount	int	0
safepointId	ulong	93
startTime	long: millis	13194505875
totalThreadCount	int	89

jniCriticalThreadCount	int	0
safepointId	ulong	37
startTime	long: millis	4667525458
totalThreadCount	int	23

SafepointStateSynchronization

startTime duration eventThread 11 17 21 22 23

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	3
iterations	int	3
runningThreadCount	int	0
safepointId	ulong	18
startTime	long: millis	1601886750

initialThreadCount	int	5
iterations	int	5
runningThreadCount	int	0
safepointId	ulong	49
startTime	long: millis	1997676875

initialThreadCount	int	3
iterations	int	3
runningThreadCount	int	0
safepointId	ulong	97
startTime	long: millis	15330316500

SafepointCleanup

startTime duration eventThread 11 17 21 22 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	62
startTime	long: millis	8122682875

safepointId	ulong	97
startTime	long: millis	22917157458

safepointId	ulong	33
startTime	long: millis	1790009875

SafepointCleanupTask

startTime duration eventThread 11 17 21 22 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	89
startTime	long: millis	7634029667

name	string	updating inline caches
safepointId	ulong	14
startTime	long: millis	1004533792

name	string	updating inline caches
safepointId	ulong	83
startTime	long: millis	14720973292

SafepointEnd

startTime duration eventThread 11 17 21 22 23 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	35
startTime	long: millis	4255443875

safepointId	ulong	44
startTime	long: millis	1939193333

safepointId	ulong	25
startTime	long: millis	2026659542

ExecuteVMOperation

default profiling startTime duration eventThread 11 17 21 22 23 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	UCT-akka.actor.default-dispatcher-19
javaThreadId	long	74
osName	string	UCT-akka.actor.default-dispatcher-19
osThreadId	long	60931
virtual	boolean	false
operation	VMOperationType	ICBufferFull
safepoint	boolean	true
safepointId	ulong	64
startTime	long: millis	8163188709

blocking	boolean	true
caller	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	ForkJoinPool.commonPool-worker-6
javaThreadId	long	28
osName	string	ForkJoinPool.commonPool-worker-6
osThreadId	long	30211
virtual	boolean	false
operation	VMOperationType	GenCollectForAllocation
safepoint	boolean	true
safepointId	ulong	40
startTime	long: millis	1883790625

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	10499
virtual	boolean	false
operation	VMOperationType	ParallelGCFailedAllocation
safepoint	boolean	true
safepointId	ulong	96
startTime	long: millis	22667474958

Shutdown

default profiling startTime eventThread stackTrace 11 17 21 22 23

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	98967385458

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

SymbolTableStatistics

default profiling startTime duration every chunk 13 17 21 22 23

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	4.9188232
bucketCountMaximum	ulong	18
bucketCountStandardDeviation	float	2.2369964
bucketCountVariance	float	5.0041523
entryCount	ulong	161180
insertionRate	float	1936.374
removalRate	float	1651.561
startTime	long: millis	77363861500
totalFootprint	ulong: bytes	13853992

bucketCount	ulong	32768
bucketCountAverage	float	4.628235
bucketCountMaximum	ulong	17
bucketCountStandardDeviation	float	2.167396
bucketCountVariance	float	4.697606
entryCount	ulong	151658
insertionRate	float	939.2614
removalRate	float	3.3683038
startTime	long: millis	41771535917
totalFootprint	ulong: bytes	13059880

StringTableStatistics

default profiling startTime duration every chunk 13 17 21 22 23

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	0.18327332
bucketCountMaximum	ulong	4
bucketCountStandardDeviation	float	0.4282238
bucketCountVariance	float	0.18337561
entryCount	ulong	12011
insertionRate	float	8805.0
removalRate	float	142.0
startTime	long: millis	10766010542
totalFootprint	ulong: bytes	1475456

bucketCount	ulong	65536
bucketCountAverage	float	0.54522705
bucketCountMaximum	ulong	7
bucketCountStandardDeviation	float	0.7271707
bucketCountVariance	float	0.52877724
entryCount	ulong	35732
insertionRate	float	21.326637
removalRate	float	6.5245876
startTime	long: millis	98638319375
totalFootprint	ulong: bytes	3020168

bucketCount	ulong	65536
bucketCountAverage	float	0.18397522
bucketCountMaximum	ulong	4
bucketCountStandardDeviation	float	0.42945325
bucketCountVariance	float	0.1844301
entryCount	ulong	12057
insertionRate	float	8829.0
removalRate	float	137.0
startTime	long: millis	10651935583
totalFootprint	ulong: bytes	1478424

ThreadDump

default profiling startTime duration every chunk 11 17 21 22 23

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 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 12:47:28 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 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 22 23

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	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

Examples 3

baseAddress	ulong: address	6605451264
name	string	/System/Library/Frameworks/CoreText.framework/Versions/A/CoreText
startTime	long: millis	423214667
topAddress	ulong: address	0

baseAddress	ulong: address	6752649216
name	string	/usr/lib/liblangid.dylib
startTime	long: millis	364596583
topAddress	ulong: address	0

baseAddress	ulong: address	6563414016
name	string	/usr/lib/libobjc.A.dylib
startTime	long: millis	675848959
topAddress	ulong: address	0

ModuleRequire

default profiling startTime every chunk 11 17 21 22 23

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.sql
name	string	java.sql
version	string	21.0.1
startTime	long: millis	16763952708

requiredModule	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
source	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.datatransfer
name	string	java.datatransfer
version	string	21.0.1
startTime	long: millis	14998474333

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

ModuleExport

default profiling startTime every chunk 11 17 21 22 23

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/util/hashing
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	akka/serialization
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/convert
startTime	long: millis	14998523917
targetModule	Module	null

Java Application

ThreadStart

default profiling startTime eventThread stackTrace 11 17 21 22 23 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	UCT-akka.actor.default-dispatcher-5
javaThreadId	long	94
osName	string	UCT-akka.actor.default-dispatcher-5
osThreadId	long	42503
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	12620596250
thread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.default-dispatcher-8
javaThreadId	long	97
osName	string	UCT-akka.actor.default-dispatcher-8
osThreadId	long	41479
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-15
javaThreadId	long	67
osName	string	UCT-akka.actor.default-dispatcher-15
osThreadId	long	39939
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	7060888417
thread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.default-dispatcher-16
javaThreadId	long	69
osName	string	UCT-akka.actor.default-dispatcher-16
osThreadId	long	64771
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

ThreadEnd

default profiling startTime eventThread 11 17 21 22 23 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	10752672375
thread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.default-dispatcher-15
javaThreadId	long	67
osName	string	UCT-akka.actor.default-dispatcher-15
osThreadId	long	39939
virtual	boolean	false

startTime	long: millis	19794898417
thread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.default-dispatcher-5
javaThreadId	long	116
osName	string	UCT-akka.actor.default-dispatcher-5
osThreadId	long	61959
virtual	boolean	false

startTime	long: millis	13439257125
thread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.default-dispatcher-15
javaThreadId	long	113
osName	string	UCT-akka.actor.default-dispatcher-15
osThreadId	long	67331
virtual	boolean	false

ThreadPark

default profiling startTime duration eventThread stackTrace 11 17 21 22 23 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	30352314792
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	8202623167
timeout	long: nanos	-9223372036854775808
until	long: epochmillis	-9223372036854775808

address	ulong: address	31575547344
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	6015623792
timeout	long: nanos	-9223372036854775808
until	long: epochmillis	-9223372036854775808

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	5610907750
timeout	long: nanos	-9223372036854775808
until	long: epochmillis	-9223372036854775808

JavaMonitorEnter

default profiling startTime duration eventThread stackTrace 11 17 21 22 23 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	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-10
javaThreadId	long	58
osName	string	UCT-akka.actor.default-dispatcher-10
osThreadId	long	40963
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	8125580333

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-5
javaThreadId	long	45
osName	string	UCT-akka.actor.default-dispatcher-5
osThreadId	long	28167
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	7569123250

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-9
javaThreadId	long	107
osName	string	UCT-akka.actor.default-dispatcher-9
osThreadId	long	65539
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	11163384875

JavaMonitorWait

default profiling startTime duration eventThread stackTrace 11 17 21 22 23 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	105553229372944
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	scala/concurrent/stm/ccstm/TxnLevelImpl
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/stm/ccstm
notifier	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	Thread-36
javaThreadId	long	377
osName	string	Thread-36
osThreadId	long	61971
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	52114869667
timedOut	boolean	false
timeout	long: millis	0

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
notifier	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.default-dispatcher-18
javaThreadId	long	115
osName	string	UCT-akka.actor.default-dispatcher-18
osThreadId	long	44551
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	10801087542
timedOut	boolean	false
timeout	long: millis	0

address	ulong: address	105553570092944
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/FinagleChirper$Client
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	Thread-43
javaThreadId	long	384
osName	string	Thread-43
osThreadId	long	32795
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	86795064333
timedOut	boolean	false
timeout	long: millis	0

JavaMonitorInflate

profiling startTime duration eventThread stackTrace 11 17 21 22 23 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 22 23 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	Inlined
		…
truncated	boolean	false
startTime	long: millis	1128732083
tlabSize	ulong: bytes	1314848

allocationSize	ulong: bytes	24
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	1041106125
tlabSize	ulong: bytes	1394536

allocationSize	ulong: bytes	144
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	0
lineNumber	int	-1
method	Method
descriptor	string	(I)Ljava/lang/Throwable;
hidden	boolean	false
modifiers	int	258
name	string	fillInStackTrace
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	Native
		…
truncated	boolean	false
startTime	long: millis	947270875
tlabSize	ulong: bytes	39480

ObjectAllocationOutsideTLAB

startTime eventThread stackTrace 11 17 21 22 23

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	15160
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	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	2020433292

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	scala/collection/immutable/RedBlackTree$Tree
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	scala/collection/immutable
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	51
lineNumber	int	682
method	Method
descriptor	string	(Lscala/collection/immutable/RedBlackTree$Tree;)Lscala/collection/immutable/RedBlackTree$Tree;
hidden	boolean	false
modifiers	int	1
name	string	withLeft
type	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hidden	boolean	false
modifiers	int	49
name	string	scala/collection/immutable/RedBlackTree$Tree
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	17000207292

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	64
lineNumber	int	89
method	Method
descriptor	string	(Ljava/io/InputStream;Ljava/util/zip/Inflater;I)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/zip/InflaterInputStream
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	Interpreted
		…
truncated	boolean	false
startTime	long: millis	936985834

ObjectAllocationSample

throttle default profiling startTime eventThread stackTrace 16 17 21 22 23

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	32
name	string	java/net/URLClassLoader$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/net
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	420
method	Method
descriptor	string	(Ljava/lang/String;)Ljava/lang/Class;
hidden	boolean	false
modifiers	int	4
name	string	findClass
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
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	945481167
weight	long: bytes	38392

objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	java/util/ArrayList$SubList
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
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	9
lineNumber	int	1191
method	Method
descriptor	string	(II)Ljava/util/List;
hidden	boolean	false
modifiers	int	1
name	string	subList
type	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
type	FrameType	JIT compiled
		…
truncated	boolean	false
startTime	long: millis	930869208
weight	long: bytes	1432952

objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	0
name	string	[Ljava/util/regex/IntHashSet;
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	83
lineNumber	int	253
method	Method
descriptor	string	(Ljava/util/regex/Pattern;Ljava/lang/CharSequence;)V
hidden	boolean	false
modifiers	int	0
name	string	<init>
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	JIT compiled
		…
truncated	boolean	false
startTime	long: millis	1074735792
weight	long: bytes	1341168

JavaErrorThrow

default profiling startTime duration stackTrace 11 17 21 22 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	Found class java.lang.Object, but interface was expected
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	2038255834
thrownClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/IncompatibleClassChangeError
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	Exception java.lang.ExceptionInInitializerError [in thread "main"]
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	8
lineNumber	int	86
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/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	28443578292
thrownClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/ExceptionInInitializerError
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	'int java.lang.invoke.DirectMethodHandle$Holder.invokeInterface(java.lang.Object, 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	4640548417
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 22 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 22 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	56505
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	30012215250

address	string	127.0.0.1
bytesWritten	long: bytes	50
host	string
port	int	52657
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	49261870667

address	string	127.0.0.1
bytesWritten	long: bytes	50
host	string
port	int	52294
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	39942762000

VirtualThreadStart

experimental startTime duration stackTrace 19 21 22 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 22 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	'java.lang.Object java.lang.invoke.DirectMethodHandle$Holder.newInvokeSpecial(java.lang.Object, int, 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	703418000
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	scala.collection.immutable.ArraySeq$ofByte
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	591482875
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	null
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	30
lineNumber	int	259
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/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	549340917
thrownClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	sun/nio/fs/UnixException
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/fs

FileWrite

default profiling startTime duration stackTrace 11 17 21 22 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	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

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

VirtualThreadEnd

experimental startTime duration stackTrace 19 21 22 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 22 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	52658
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	51026146875
timeout	long: millis	0

address	string	127.0.0.1
bytesRead	long: bytes	1
endOfStream	boolean	false
host	string
port	int	52292
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	37431385958
timeout	long: millis	0

address	string	127.0.0.1
bytesRead	long: bytes	65
endOfStream	boolean	false
host	string
port	int	56505
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	35699398417
timeout	long: millis	0

FileRead

default profiling startTime duration stackTrace 11 17 21 22 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

SerialGC
ZGC

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

bytesRead	long: bytes	4
endOfFile	boolean	false
path	string	[...]/code/experiments/jfreventcollector/harness-124931-6974251686310067154/apache-spark/lib/curator-recipes-2.13.0.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	Inlined
		…
truncated	boolean	false
startTime	long: millis	30635721500

VirtualThreadPinned

experimental default profiling startTime duration stackTrace 19 21 22 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 22 23

Source src/jdk.jfr/share/classes/jdk/jfr/events/ThreadSleepEvent.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	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	8645554542
time	long: nanos	10000000

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	7904357583
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	8323205583
time	long: nanos	9000000

Java Application Statistics

JavaThreadStatistics

default profiling startTime duration every chunk 11 17 21 22 23 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	416
activeCount	long	142
daemonCount	long	133
peakCount	long	143
startTime	long: millis	83100639000

accumulatedCount	long	248
activeCount	long	23
daemonCount	long	22
peakCount	long	84
startTime	long: millis	30104082250

accumulatedCount	long	91
activeCount	long	83
daemonCount	long	22
peakCount	long	83
startTime	long: millis	10760064834

ClassLoadingStatistics

default profiling startTime duration every chunk 11 17 21 22 23 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	14322
startTime	long: millis	51343859375
unloadedClassCount	long	3198

loadedClassCount	long	28778
startTime	long: millis	82095982167
unloadedClassCount	long	11848

loadedClassCount	long	28690
startTime	long: millis	65175946167
unloadedClassCount	long	11846

ClassLoaderStatistics

default profiling startTime duration every chunk 11 17 21 22 23

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	11904640
chunkSize	ulong: bytes	11916288
classCount	long	1472
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
classLoaderData	ulong: address	105553176905600
hiddenBlockSize	ulong: bytes	0
hiddenChunkSize	ulong: bytes	0
hiddenClassCount	long	0
parentClassLoader	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
startTime	long: millis	30519779917

blockSize	ulong: bytes	35782448
chunkSize	ulong: bytes	35796992
classCount	long	6003
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
classLoaderData	ulong: address	105553170117440
hiddenBlockSize	ulong: bytes	0
hiddenChunkSize	ulong: bytes	0
hiddenClassCount	long	0
parentClassLoader	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
startTime	long: millis	74881024083

blockSize	ulong: bytes	1779992
chunkSize	ulong: bytes	1799168
classCount	long	187
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
classLoaderData	ulong: address	105553151722432
hiddenBlockSize	ulong: bytes	0
hiddenChunkSize	ulong: bytes	0
hiddenClassCount	long	0
parentClassLoader	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
startTime	long: millis	22061741125

ThreadAllocationStatistics

default profiling startTime every chunk 11 17 21 22 23

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	0
startTime	long: millis	423203583
thread	Thread
group	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	JFR Recorder Thread
javaThreadId	long	15
osName	string	JFR Recorder Thread
osThreadId	long	23299
virtual	boolean	false

allocated	ulong: bytes	45049672
startTime	long: millis	14906032000
thread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.default-dispatcher-12
javaThreadId	long	101
osName	string	UCT-akka.actor.default-dispatcher-12
osThreadId	long	41223
virtual	boolean	false

allocated	ulong: bytes	640
startTime	long: millis	675822792
thread	Thread
group	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	Reference Handler
javaThreadId	long	9
osName	string	Reference Handler
osThreadId	long	22531
virtual	boolean	false

FinalizerStatistics

default profiling startTime end of every chunk 18 21 22 23

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-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	78866130917
totalFinalizersRun	ulong	0

codeSource	Symbol	file://[...]/code/experiments/jfreventcollector/harness-124622-12434569844652140370/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$DirectArena
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	87968013458
totalFinalizersRun	ulong	0

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$DirectArena
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	50890275334
totalFinalizersRun	ulong	0

ExceptionStatistics

default profiling startTime duration stackTrace 11 17 21 22 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	92191504875
throwables	long	340156

stackTrace	StackTrace	null
startTime	long: millis	51975206042
throwables	long	205619

stackTrace	StackTrace	null
startTime	long: millis	8870186250
throwables	long	2693

DirectBufferStatistics

default profiling startTime duration stackTrace 15 17 21 22 23

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	57041040917

stackTrace	StackTrace	null
startTime	long: millis	88354790500

stackTrace	StackTrace	null
startTime	long: millis	27323890208

Java Development Kit

X509Certificate

startTime duration stackTrace 11 17 21 22 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 22 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 22 23

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

Category: Java Development Kit / Security

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 22 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

experimental default profiling startTime duration stackTrace 19 21 22 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 22 23

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

Category: Java Development Kit / Security

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	SHA
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	539427292
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	463012625
type	string	SecureRandom

SecurityPropertyModification

startTime duration stackTrace 11 17 21 22 23

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

Category: Java Development Kit / Security

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 22 23

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	policy.expandProperties
stackTrace	StackTrace	null
startTime	long: millis	437656458
value	string	true

key	string	jdk.sasl.disabledMechanisms
stackTrace	StackTrace	null
startTime	long: millis	379201833
value	string

key	string	crypto.policy
stackTrace	StackTrace	null
startTime	long: millis	13056182542
value	string	unlimited

Operating System

OSInformation

default profiling startTime duration end of every chunk 11 17 21 22 23 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	40019892458

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	93733076333

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	12862193875

VirtualizationInformation

default profiling startTime duration end of every chunk 11 17 21 22 23

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	40019893083

name	string	No virtualization detected
startTime	long: millis	50916130209

name	string	No virtualization detected
startTime	long: millis	60343486458

InitialEnvironmentVariable

default profiling startTime end of every chunk 11 17 21 22 23 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	MAVEN_HOME
startTime	long: millis	17889813583
value	string	[...]/.sdkman/candidates/maven/current

key	string	LOGNAME
startTime	long: millis	672949625
value	string	i560383

key	string	SDKROOT
startTime	long: millis	364250500
value	string	/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk

SystemProcess

default profiling startTime duration end of every chunk 11 17 21 22 23

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/usermanagerd
pid	string	594
startTime	long: millis	16726490792

commandLine	string	/usr/libexec/runningboardd
pid	string	608
startTime	long: millis	12397004584

commandLine	string	/usr/sbin/syslogd
pid	string	570
startTime	long: millis	14787855958

CPUInformation

default profiling startTime duration end of every chunk 11 17 21 22 23

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	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	52080841958

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	672965459

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	17889820583

CPUTimeStampCounter

default profiling startTime duration end of every chunk 11 17 21 22 23

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	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	84413967333

fastTimeAutoEnabled	boolean	false
fastTimeEnabled	boolean	false
fastTimeFrequency	long: hertz	1000000000
osFrequency	long: hertz	1000000000
startTime	long: millis	75084820125

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

CPULoad

default profiling startTime duration every chunk 11 17 21 22 23

Category: Operating System / Processor

OS CPU Load

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	0.0016977303
jvmUser	float: percentage	0.011041899
machineTotal	float: percentage	1.0
startTime	long: millis	36411407958

jvmSystem	float: percentage	7.5414055E-4
jvmUser	float: percentage	0.011696243
machineTotal	float: percentage	0.915404
startTime	long: millis	52999943167

jvmSystem	float: percentage	1.6864874E-4
jvmUser	float: percentage	0.007366253
machineTotal	float: percentage	0.8620253
startTime	long: millis	25983356417

ThreadCPULoad

default profiling startTime duration eventThread every chunk 11 17 21 22 23

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	11837850417
system	float: percentage	1.716347E-4
user	float: percentage	5.023455E-4

startTime	long: millis	14619537000
system	float: percentage	2.7751166E-4
user	float: percentage	0.0029336298

startTime	long: millis	10760177417
system	float: percentage	0.0041409223
user	float: percentage	0.0027015386

ThreadContextSwitchRate

default profiling startTime duration every chunk 11 17 21 22 23

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	32358574500
switchRate	float: hertz	11796.922

startTime	long: millis	41764620875
switchRate	float: hertz	98529.95

startTime	long: millis	45297165792
switchRate	float: hertz	46093.758

NetworkUtilization

default profiling startTime every chunk 11 17 21 22 23

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	17752
startTime	long: millis	67196845709
writeRate	long: bits-per-second	29048

networkInterface	NetworkInterfaceName	en0
readRate	long: bits-per-second	3845944
startTime	long: millis	35158814125
writeRate	long: bits-per-second	2610960

networkInterface	NetworkInterfaceName	en0
readRate	long: bits-per-second	3898664
startTime	long: millis	10643442833
writeRate	long: bits-per-second	2663056

PhysicalMemory

default profiling startTime duration every chunk 11 17 21 22 23 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	96451662292
totalSize	ulong: bytes	17179869184
usedSize	ulong: bytes	17130455040

startTime	long: millis	93747106375
totalSize	ulong: bytes	17179869184
usedSize	ulong: bytes	17078272000

startTime	long: millis	74972143917
totalSize	ulong: bytes	17179869184
usedSize	ulong: bytes	17122148352

ContainerConfiguration

default profiling startTime duration stackTrace 17 21 22 23

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 22 23

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 22 23

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

ContainerCPUUsage

default profiling startTime duration stackTrace 17 21 22 23

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 22 23

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 15 17 21 22 23

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

Category: Operating System

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.

Truffle Compiler

org.graalvm.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

org.graalvm.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

org.graalvm.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

org.graalvm.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

org.graalvm.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

if_icmpge

ifnonnull

if_icmpne

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

descriptor	string	(B)V
name	string	putUncheckedByte
type	string	jdk/jfr/internal/event/EventWriter

descriptor	string	(I)C
name	string	charAt
type	string	java/lang/String

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-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

reinterpret

maybe_recompile

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

profile_predicate

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

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	0
directAllocated	ulong: bytes	0
failureUsed	ulong: bytes	0
failureWaste	ulong: bytes	0
gcId	uint	84
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

allocated	ulong: bytes	9071808
directAllocated	ulong: bytes	0
failureUsed	ulong: bytes	0
failureWaste	ulong: bytes	0
gcId	uint	18
numDirectAllocated	ulong	5
numPlabsFilled	ulong	7504122885671534260
regionEndWaste	ulong: bytes	0
regionsRefilled	uint	5
undoWaste	ulong: bytes	0
used	ulong: bytes	8165816
wasted	ulong: bytes	36248

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 1

G1GC

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

Mixed

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

Allocation Failure

G1 Evacuation Pause

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

ParallelScavenge

G1Old

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

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

Metadata

Class

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

ConstantPool

ConstMethod

Method

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	15990784
reserved	ulong: bytes	1140850688
used	ulong: bytes	15861616

committed	ulong: bytes	14483456
reserved	ulong: bytes	67108864
used	ulong: bytes	14415168

committed	ulong: bytes	1507328
reserved	ulong: bytes	1073741824
used	ulong: bytes	1446448

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.

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

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	33196867584
size	ulong: bytes	268435456
start	ulong: address	32928432128
used	ulong: bytes	0

end	ulong: address	33234092032
size	ulong: bytes	37224448
start	ulong: address	33196867584
used	ulong: bytes	0

end	ulong: address	30244077568
size	ulong: bytes	179306496
start	ulong: address	30064771072
used	ulong: bytes	79145128

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	30171713208
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	30191246872
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/locks/AbstractQueuedSynchronizer$ConditionNode
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/locks

address	ulong: address	31586402872
description	string	Class Name: com.twitter.finagle.ClientConnection$
referrer	Reference	null
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

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

Weak reference

Soft 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

Regular

Collection Set

Empty Committed

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	420
method	Method
descriptor	string	(Ljava/lang/String;)Ljava/lang/Class;
hidden	boolean	false
modifiers	int	4
name	string	findClass
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
type	FrameType	Interpreted

bytecodeIndex	int	53
lineNumber	int	270
method	Method
descriptor	string	()Z
hidden	boolean	false
modifiers	int	1
name	string	endEvent
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	jdk/jfr/internal/event/EventWriter
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/jdk.jfr
name	string	jdk.jfr
version	string	21.0.1
name	string	jdk/jfr/internal/event
type	FrameType	Interpreted

bytecodeIndex	int	0
lineNumber	int	181
method	Method
descriptor	string	(Ljava/util/Locale;)Ljava/text/DecimalFormatSymbols;
hidden	boolean	false
modifiers	int	25
name	string	getInstance
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/text/DecimalFormatSymbols
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/text
type	FrameType	Interpreted

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-124622-12434569844652140370/twitter-finagle/lib/netty-buffer-4.1.72.Final.jar

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

null

name	string	system
parent	ThreadGroup	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

ParallelGCFailedAllocation

ICBufferFull

GenCollectForAllocation

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	32287752192
committedSize	ulong: bytes	2222981120
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

committedEnd	ulong: address	30553407488
committedSize	ulong: bytes	488636416
reservedEnd	ulong: address	34359738368
reservedSize	ulong: bytes	4294967296
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 1

Small

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

Allocation Rate

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 References Enqueue

XML Content Types

address

Annotation: jdk.jfr.MemoryAddress

Examples 3

4649009152

6563414016

bits-per-second

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

Examples 3

29048

3898664

17752

bytes

Annotation: jdk.jfr.DataAmount(BYTES)

Examples 3

17122148352

640

17179869184

bytes-per-second

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

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

Examples 2

G1GC
G1GC

186228.25959883735

6.178758485430387E8

certificateId

Annotation: jdk.jfr.events.CertificateId

epochmillis

Annotation: jdk.jfr.Timestamp(MILLISECONDS_SINCE_EPOCH)

Examples 3

1702902685041

1702902684442

-9223372036854775808

hertz

Annotation: jdk.jfr.Frequency

Examples 3

98529.95

1000000000

microseconds

17+

Annotation: jdk.jfr.Timespan(MICROSECONDS)

millis

Annotation: jdk.jfr.Timespan(MILLISECONDS)

Examples 3

27599379209

726106000

693280375

nanos

Annotation: jdk.jfr.Timespan(NANOSECONDS)

Examples 3

500000000

-9223372036854775808

30000000

percentage

Annotation: jdk.jfr.Percentage

Examples 3

0.47368422

0.011696243

0.44999996

tickspan

Annotation: jdk.jfr.Timespan(TICKS)

Examples 3

2909861542

4009417

2310459

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	49
name	string	jdk/jfr/internal/Bits
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/jdk.jfr
name	string	jdk.jfr
version	string	21.0.1
name	string	jdk/jfr/internal

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	()Z
hidden	boolean	false
modifiers	int	1
name	string	endEvent
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	jdk/jfr/internal/event/EventWriter
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/jdk.jfr
name	string	jdk.jfr
version	string	21.0.1
name	string	jdk/jfr/internal/event

descriptor	string	(Ljava/lang/String;)V
hidden	boolean	false
modifiers	int	2
name	string	putStringValue
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	jdk/jfr/internal/event/EventWriter
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/jdk.jfr
name	string	jdk.jfr
version	string	21.0.1
name	string	jdk/jfr/internal/event

descriptor	string	(Ljava/util/Locale;)Ljava/text/DecimalFormatSymbols;
hidden	boolean	false
modifiers	int	25
name	string	getInstance
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/text/DecimalFormatSymbols
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/text

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:/jdk.jfr
name	string	jdk.jfr
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

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/util/spi

exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/jdk.jfr
name	string	jdk.jfr
version	string	21.0.1
name	string	jdk/jfr/internal

exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/jdk.jfr
name	string	jdk.jfr
version	string	21.0.1
name	string	jdk/jfr/internal/event

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	53
lineNumber	int	270
method	Method
descriptor	string	()Z
hidden	boolean	false
modifiers	int	1
name	string	endEvent
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	jdk/jfr/internal/event/EventWriter
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/jdk.jfr
name	string	jdk.jfr
version	string	21.0.1
name	string	jdk/jfr/internal/event
type	FrameType	Interpreted
		…
truncated	boolean	false

frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	420
method	Method
descriptor	string	(Ljava/lang/String;)Ljava/lang/Class;
hidden	boolean	false
modifiers	int	4
name	string	findClass
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
type	FrameType	Interpreted
		…
truncated	boolean	false

frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	181
method	Method
descriptor	string	(Ljava/util/Locale;)Ljava/text/DecimalFormatSymbols;
hidden	boolean	false
modifiers	int	25
name	string	getInstance
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/text/DecimalFormatSymbols
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/text
type	FrameType	Interpreted
		…
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-20
javaThreadId	long	118
osName	string	UCT-akka.actor.default-dispatcher-20
osThreadId	long	83971
virtual	boolean	false

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	system
parent	ThreadGroup	null
javaName	string	Reference Handler
javaThreadId	long	9
osName	string	Reference Handler
osThreadId	long	22531
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

78464179792

75090663667

38915936000

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

0.0

10.0

25.0

float


Parameter Type	float
Field Type	float
Java Type	float

Examples 3

4.628235

2.167396

4.697606

int


Parameter Type	s4
Field Type	s4
Java Type	int

Examples 3

long


Parameter Type	s8
Field Type	s8
Java Type	long

Examples 3

21922

22531

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

bootstrap

jdk/jfr/internal

jdk/jfr/internal/Bits

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

1073741824

ushort

unsigned


Parameter Type	u2
Field Type	u2
Java Type	short

Examples 3