Introduction

The following are the events for the OpenJDK 11 (jdk-11.0.24+7, 10-July-2024), and Graal VM 22.3.3 (jdk-11.0.20) . The events are collected from the event configuration and the source code. Visit jfreventcollector for more information. this is also the place you can contribute additional event descriptions, if you don't want to contribute them directly to the OpenJDK. The site generator lives on GitHub too.

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

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

Flight Recorder

DumpReason

default profiling startTime 11 17 21 23 24

Category: Flight Recorder

Who requested the recording and why

Configuration	enabled
default	true
profiling	true

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

DataLoss

default profiling startTime 11 17 21 23 24 graal vm

Category: Flight Recorder

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

Configuration	enabled
default	true
profiling	true

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

ActiveRecording

default profiling startTime duration stackTrace 11 17 21 23 24

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

Category: Flight Recorder

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

Configuration	enabled
default	true
profiling	true

Field	Type	Description
id	long	Id
name	string	Name Consider contributing a description to jfreventcollector.
destination	string	Destination Consider contributing a description to jfreventcollector.
maxAge	long: millis	Max Age
maxSize	long: bytes	Max Size
recordingStart	long: epochmillis	Start Time
recordingDuration	long: millis	Recording Duration

Examples 3

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

destination	string	[...]/code/experiments/jfreventcollector/jfr/sample_UseSerialGC.jfr
id	long	1
maxAge	long: millis	9223372036854775807
maxSize	long: bytes	262144000
name	string	1
recordingDuration	long: millis	9223372036854775807
recordingStart	long: epochmillis	1702899981921
stackTrace	StackTrace	null
startTime	long: millis	84412629542

destination	string	[...]/code/experiments/jfreventcollector/jfr/sample_UseG1GC.jfr
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	12854214084

ActiveSetting

default profiling startTime duration stackTrace 11 17 21 23 24

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

Category: Flight Recorder

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

Configuration	enabled
default	true
profiling	true

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

Examples 3

id	long	45
name	string	threshold
stackTrace	StackTrace	null
startTime	long: millis	360834042
value	string	0 ms

id	long	25
name	string	stackTrace
stackTrace	StackTrace	null
startTime	long: millis	416785542
value	string	true

id	long	15
name	string	threshold
stackTrace	StackTrace	null
startTime	long: millis	669832834
value	string	0 ms

JVM

JVMInformation

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

Category: Java Virtual Machine

Description of JVM and the Java application

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

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

Examples 3

javaArguments	string	[...]/code/experiments/jfreventcollector/.cache/renaissance.jar -t 5 -r 1 all
jvmArguments	string	-XX:StartFlightRecording=filename=[...]/code/experiments/jfreventcollector/jfr/sample_UseSerialGC.jfr,settings=[...]/code/experiments/jfreventcollector/.cache/jfc.jfc -XX:+UseSerialGC
jvmFlags	string	null
jvmName	string	OpenJDK 64-Bit Server VM
jvmStartTime	long: epochmillis	1702899981604
jvmVersion	string	OpenJDK 64-Bit Server VM (21.0.1+12-LTS) for bsd-aarch64 JRE (21.0.1+12-LTS), built on 2023-10-17T00:00:00Z by "admin" with clang Apple LLVM 12.0.0 (clang-1200.0.32.29)
pid	long	14273
startTime	long: millis	364229792

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	30585938083

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	58733054167

InitialSystemProperty

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

Category: Java Virtual Machine

System Property at JVM start

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
key	string	Key
value	string	Value

Examples 3

key	string	java.vm.vendor
startTime	long: millis	30519032542
value	string	Eclipse Adoptium

key	string	java.vm.vendor
startTime	long: millis	27599399542
value	string	Eclipse Adoptium

key	string	java.vm.compressedOopsMode
startTime	long: millis	17889809625
value	string	Zero based

JVM: Class Loading

ClassLoad

startTime duration eventThread stackTrace 11 17 21 23 24

Category: Java Virtual Machine / Class Loading

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

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

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

Examples 3

definingClassLoader	ClassLoader
name	string	bootstrap
type	Class	null
initiatingClassLoader	ClassLoader
name	string	bootstrap
type	Class	null
loadedClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	java/util/Collections$SynchronizedSet
package	Package
exported	boolean	true
module	Module
classLoader	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	0
lineNumber	int	2407
method	Method
descriptor	string	(Ljava/util/Set;Ljava/lang/Object;)Ljava/util/Set;
hidden	boolean	false
modifiers	int	8
name	string	synchronizedSet
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/util/Collections
package	Package
exported	boolean	true
module	Module
classLoader	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	436992042

definingClassLoader	ClassLoader	null
initiatingClassLoader	ClassLoader	null
loadedClass	Class
classLoader	ClassLoader	null
hidden	boolean	true
modifiers	int	48
name	string	java.lang.invoke.LambdaForm$DMH+0x0000000800100000/1402433372
package	Package
exported	boolean	true
module	Module
classLoader	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/invoke
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	(Ljava/lang/ClassLoader;Ljava/lang/Class;Ljava/lang/String;[BIILjava/security/ProtectionDomain;ZILjava/lang/Object;)Ljava/lang/Class;
hidden	boolean	false
modifiers	int	264
name	string	defineClass0
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	383761667

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	32
name	string	java/util/Formatter$Conversion
package	Package
exported	boolean	true
module	Module
classLoader	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	106
lineNumber	int	2839
method	Method
descriptor	string	(Ljava/lang/String;)Ljava/util/List;
hidden	boolean	false
modifiers	int	8
name	string	parse
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/util/Formatter
package	Package
exported	boolean	true
module	Module
classLoader	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	723911959

ClassDefine

startTime eventThread stackTrace 11 17 21 23 24

Category: Java Virtual Machine / Class Loading

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

Configuration	enabled	stackTrace
default	false	true
profiling	false	true

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

Examples 3

definedClass	Class
classLoader	ClassLoader
name	string	app
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	jdk/internal/loader/ClassLoaders$AppClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	jdk/internal/loader
hidden	boolean	false
modifiers	int	48
name	string	org/renaissance/core/Launcher$LaunchException
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$AppClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	jdk/internal/loader
location	string	null
name	string	null
version	string	null
name	string	org/renaissance/core
definingClassLoader	ClassLoader
name	string	app
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	jdk/internal/loader/ClassLoaders$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
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	711978167

definedClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	1057
name	string	java/util/logging/Formatter
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.logging
name	string	java.logging
version	string	21.0.1
name	string	java/util/logging
definingClassLoader	ClassLoader
name	string	bootstrap
type	Class	null
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	(Ljava/lang/String;)Ljava/lang/Class;
hidden	boolean	false
modifiers	int	266
name	string	findBootstrapClass
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	1057
name	string	java/lang/ClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	450155750

definedClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	sun/nio/fs/UnixFileKey
package	Package
exported	boolean	true
module	Module
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
definingClassLoader	ClassLoader
name	string	bootstrap
type	Class	null
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	19
lineNumber	int	201
method	Method
descriptor	string	()Lsun/nio/fs/UnixFileKey;
hidden	boolean	false
modifiers	int	1
name	string	fileKey
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	sun/nio/fs/UnixFileAttributes
package	Package
exported	boolean	true
module	Module
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	Interpreted
		…
truncated	boolean	false
startTime	long: millis	380577000

ClassUnload

startTime eventThread 11 17 21 23 24

Category: Java Virtual Machine / Class Loading

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

Configuration	enabled
default	false
profiling	false

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

Examples 3

definingClassLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
startTime	long: millis	4558880542
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/spi/LocationAwareLogger
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/spi

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	3889467417
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	true
modifiers	int	4144
name	string	org.apache.spark.internal.config.package$$$Lambda+0x000000080036dc90/716972621
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	org/apache/spark/internal/config

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	5993897375
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	true
modifiers	int	4144
name	string	org.apache.spark.internal.config.package$$$Lambda+0x00000008003738b0/1407167674
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	org/apache/spark/internal/config

JVM: Code Cache

CodeCacheFull

default profiling startTime eventThread 11 17 21 23 24

Category: Java Virtual Machine / Code Cache

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

Configuration	enabled
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

CodeCacheStatistics

default profiling startTime every chunk 11 17 21 23 24

Category: Java Virtual Machine / Code Cache

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

Configuration	enabled	period
default	true	everyChunk
profiling	true	everyChunk

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

Examples 3

adaptorCount	int	0
codeBlobType	CodeBlobType	CodeHeap 'profiled nmethods'
entryCount	int	5932
fullCount	int	0
methodCount	int	5931
reservedTopAddress	ulong: address	4643160064
startAddress	ulong: address	4520263680
startTime	long: millis	58628387125
unallocatedCapacity	ulong: bytes	102094336

adaptorCount	int	625
codeBlobType	CodeBlobType	CodeHeap 'non-nmethods'
entryCount	int	716
fullCount	int	0
methodCount	int	0
reservedTopAddress	ulong: address	4610097152
startAddress	ulong: address	4604248064
startTime	long: millis	40031139833
unallocatedCapacity	ulong: bytes	4357504

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

CodeCacheConfiguration

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

Category: Java Virtual Machine / Code Cache

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

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

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

Examples 3

expansionSize	ulong: bytes	65536
initialSize	ulong: bytes	2555904
minBlockLength	ulong: bytes	6
nonNMethodSize	ulong: bytes	5839564
nonProfiledSize	ulong: bytes	122909338
profiledSize	ulong: bytes	122909338
reservedSize	ulong: bytes	251658240
reservedTopAddress	ulong: address	4733009920
startAddress	ulong: address	4481351680
startTime	long: millis	84416225000

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	60345400708

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

JVM: Code Sweeper

SweepCodeCache

default profiling startTime duration eventThread 11 17 until JDK 20

Category: Java Virtual Machine / Code Sweeper

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

Configuration	enabled	threshold
default	true	100 ms
profiling	true	100 ms

Field	Type	Description
sweepId	int	Sweep Identifier
sweptCount	uint	Methods Swept
flushedCount	uint	Methods Flushed
zombifiedCount	uint	Methods Zombified

CodeSweeperStatistics

default profiling startTime every chunk 11 17 until JDK 20

Category: Java Virtual Machine / Code Sweeper

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
sweepCount	int	Sweeps
methodReclaimedCount	int	Methods Reclaimed
totalSweepTime	Tickspan	Time Spent Sweeping
peakFractionTime	Tickspan	Peak Time Fraction Sweep
peakSweepTime	Tickspan	Peak Time Full Sweep

CodeSweeperConfiguration

default profiling startTime end of every chunk 11 17 until JDK 20

Category: Java Virtual Machine / Code Sweeper

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
sweeperEnabled	boolean	Code Sweeper Enabled
flushingEnabled	boolean	Code Cache Flushing Enabled

JVM: Compiler

Compilation

default profiling startTime duration eventThread 11 17 21 23 24

Category: Java Virtual Machine / Compiler

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

Configuration	enabled	threshold
default	true	1000 ms
profiling	true	100 ms

Field	Type	Description
method	Method	Java Method
compileId	uint	Compilation Identifier
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	25448
compileId	uint	16350
compileLevel	ushort	4
inlinedBytes	ulong: bytes	4154
isOsr	boolean	false
method	Method
descriptor	string	(Lio/netty/channel/ChannelHandlerContext;Lio/netty/buffer/ByteBuf;Lio/netty/handler/codec/http2/Http2FrameListener;)V
hidden	boolean	false
modifiers	int	2
name	string	processPayloadState
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/netty/handler/codec/http2/DefaultHttp2FrameReader
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/handler/codec/http2
startTime	long: millis	34429762000
succeded	boolean	true

codeSize	ulong: bytes	17128
compileId	uint	6678
compileLevel	ushort	4
inlinedBytes	ulong: bytes	2279
isOsr	boolean	false
method	Method
descriptor	string	(Lakka/dispatch/Envelope;)V
hidden	boolean	false
modifiers	int	17
name	string	invoke
type	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hidden	boolean	false
modifiers	int	33
name	string	akka/actor/ActorCell
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	akka/actor
startTime	long: millis	12661205333
succeded	boolean	true

codeSize	ulong: bytes	26960
compileId	uint	15440
compileLevel	ushort	4
inlinedBytes	ulong: bytes	4597
isOsr	boolean	false
method	Method
descriptor	string	(Lio/netty/channel/AbstractChannelHandlerContext;Ljava/lang/Object;)V
hidden	boolean	false
modifiers	int	8
name	string	invokeUserEventTriggered
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/channel/AbstractChannelHandlerContext
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/channel
startTime	long: millis	40809717208
succeded	boolean	true

CompilerPhase

default profiling startTime duration eventThread 11 17 21 23 24

Category: Java Virtual Machine / Compiler

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

Configuration	enabled	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 23 24

Category: Java Virtual Machine / Compiler

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

Configuration	enabled
default	false
profiling	true

Field	Type	Description
failureMessage	string	Failure Message
compileId	uint	Compilation Identifier

Examples 3

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

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

compileId	uint	23245
failureMessage	string	concurrent class loading
startTime	long: millis	82998780708

CompilerInlining

startTime eventThread 11 17 21 23 24

Category: Java Virtual Machine / Compiler / Optimization

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
compileId	uint	Compilation Identifier
caller	Method	Caller Method
callee	CalleeMethod struct	Callee Method
succeeded	boolean	Succeeded
message	string	Message
bci	int	Byte Code Index

Examples 3

bci	int	218
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	1496
message	string	callee uses too much stack
startTime	long: millis	671268250
succeeded	boolean	false

bci	int	23
callee	CalleeMethod
descriptor	string	(Ljava/lang/String;)Ljava/lang/StringBuilder;
name	string	append
type	string	java/lang/StringBuilder
caller	Method
descriptor	string	(II)V
hidden	boolean	false
modifiers	int	10
name	string	checkLength
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
compileId	uint	1448
message	string	inline
startTime	long: millis	415529792
succeeded	boolean	true

bci	int	14
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	1455
message	string	callee uses too much stack
startTime	long: millis	362604583
succeeded	boolean	false

CompilerStatistics

default profiling startTime every chunk 11 17 21 23 24

Category: Java Virtual Machine / Compiler

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

Configuration	enabled	period
default	true	1000 ms
profiling	true	1000 ms

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

Examples 3

bailoutCount	int	2
compileCount	int	14539
invalidatedCount	int	0
nmethodCodeSize	ulong: bytes	17266560
nmethodsSize	ulong: bytes	26583216
osrBytesCompiled	ulong: bytes	0
osrCompileCount	int	100
peakTimeSpent	long: millis	1099
standardBytesCompiled	ulong: bytes	0
standardCompileCount	int	14439
startTime	long: millis	48327323250
totalTimeSpent	long: millis	42017

bailoutCount	int	5
compileCount	int	26337
invalidatedCount	int	0
nmethodCodeSize	ulong: bytes	39139608
nmethodsSize	ulong: bytes	58417016
osrBytesCompiled	ulong: bytes	0
osrCompileCount	int	213
peakTimeSpent	long: millis	1103
standardBytesCompiled	ulong: bytes	0
standardCompileCount	int	26124
startTime	long: millis	60093274834
totalTimeSpent	long: millis	66885

bailoutCount	int	3
compileCount	int	14344
invalidatedCount	int	0
nmethodCodeSize	ulong: bytes	17576408
nmethodsSize	ulong: bytes	27086032
osrBytesCompiled	ulong: bytes	0
osrCompileCount	int	118
peakTimeSpent	long: millis	953
standardBytesCompiled	ulong: bytes	0
standardCompileCount	int	14226
startTime	long: millis	41436651250
totalTimeSpent	long: millis	32085

CompilerConfiguration

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

Category: Java Virtual Machine / Compiler

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

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
threadCount	int	Thread Count
tieredCompilation	boolean	Tiered Compilation

Examples 3

startTime	long: millis	58734925084
threadCount	int	4
tieredCompilation	boolean	true

startTime	long: millis	30586816333
threadCount	int	4
tieredCompilation	boolean	true

startTime	long: millis	364774125
threadCount	int	4
tieredCompilation	boolean	true

JVM: Flag

IntFlagChanged

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / Flag

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

Configuration	enabled
default	true
profiling	true

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

UnsignedIntFlagChanged

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / Flag

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

Configuration	enabled
default	true
profiling	true

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

LongFlagChanged

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / Flag

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

Configuration	enabled
default	true
profiling	true

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

UnsignedLongFlagChanged

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / Flag

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

Configuration	enabled
default	true
profiling	true

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

DoubleFlagChanged

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / Flag

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

Configuration	enabled
default	true
profiling	true

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

BooleanFlagChanged

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / Flag

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

Configuration	enabled
default	true
profiling	true

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

StringFlagChanged

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / Flag

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

Configuration	enabled
default	true
profiling	true

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

IntFlag

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

Category: Java Virtual Machine / Flag

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

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

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

Examples 3

name	string	VMThreadPriority
origin	FlagValueOrigin	Default
startTime	long: millis	27602500542
value	int	-1

name	string	JavaPriority8_To_OSPriority
origin	FlagValueOrigin	Default
startTime	long: millis	40031147833
value	int	-1

name	string	JavaPriority9_To_OSPriority
origin	FlagValueOrigin	Default
startTime	long: millis	423303208
value	int	-1

UnsignedIntFlag

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

Category: Java Virtual Machine / Flag

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

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

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

Examples 3

name	string	G1RefProcDrainInterval
origin	FlagValueOrigin	Default
startTime	long: millis	27602504542
value	uint	1000

name	string	ConcGCThreads
origin	FlagValueOrigin	Default
startTime	long: millis	60345416000
value	uint	0

name	string	G1RemSetArrayOfCardsEntriesBase
origin	FlagValueOrigin	Default
startTime	long: millis	15845317208
value	uint	8

LongFlag

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

Category: Java Virtual Machine / Flag

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

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

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

Examples 3

name	string	OSROnlyBCI
origin	FlagValueOrigin	Default
startTime	long: millis	423476167
value	long	-1

name	string	Tier3InvokeNotifyFreqLog
origin	FlagValueOrigin	Default
startTime	long: millis	364810500
value	long	10

name	string	C1MaxRecursiveInlineLevel
origin	FlagValueOrigin	Default
startTime	long: millis	676074292
value	long	1

UnsignedLongFlag

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

Category: Java Virtual Machine / Flag

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

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

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

Examples 3

name	string	AdaptiveSizeDecrementScaleFactor
origin	FlagValueOrigin	Default
startTime	long: millis	676117750
value	ulong	4

name	string	LargePageHeapSizeThreshold
origin	FlagValueOrigin	Default
startTime	long: millis	364828750
value	ulong	134217728

name	string	NUMAPageScanRate
origin	FlagValueOrigin	Default
startTime	long: millis	423576500
value	ulong	256

DoubleFlag

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

Category: Java Virtual Machine / Flag

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

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

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

Examples 3

name	string	ZCollectionIntervalMinor
origin	FlagValueOrigin	Default
startTime	long: millis	676137000
value	double	-1.0

name	string	EscapeAnalysisTimeout
origin	FlagValueOrigin	Default
startTime	long: millis	30586856667
value	double	20.0

name	string	G1PeriodicGCSystemLoadThreshold
origin	FlagValueOrigin	Default
startTime	long: millis	84416262667
value	double	0.0

BooleanFlag

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

Category: Java Virtual Machine / Flag

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

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

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

Examples 3

name	string	GenerateArrayStoreCheck
origin	FlagValueOrigin	Default
startTime	long: millis	364841833
value	boolean	true

name	string	PrintCFG2
origin	FlagValueOrigin	Default
startTime	long: millis	423596458
value	boolean	false

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

StringFlag

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

Category: Java Virtual Machine / Flag

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

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

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

Examples 3

name	string	ArchiveHeapTestClass
origin	FlagValueOrigin	Default
startTime	long: millis	30519985167
value	string	null

name	string	UseBranchProtection
origin	FlagValueOrigin	Default
startTime	long: millis	17899928167
value	string	none

name	string	SharedClassListFile
origin	FlagValueOrigin	Default
startTime	long: millis	27602575292
value	string	null

JVM: GC: Collector

GarbageCollection

default profiling startTime duration 11 17 21 23 24 graal vm

Category: Java Virtual Machine / GC / Collector

Garbage collection performed by the JVM

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

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

Examples 3

cause	GCCause	Allocation Failure
gcId	uint	33
longestPause	Tickspan	151270250
name	GCName	ParallelScavenge
startTime	long: millis	20427336000
sumOfPauses	Tickspan	151270250

cause	GCCause	Allocation Failure
gcId	uint	32
longestPause	Tickspan	7928875
name	GCName	DefNew
startTime	long: millis	1983873667
sumOfPauses	Tickspan	7928875

cause	GCCause	G1 Evacuation Pause
gcId	uint	95
longestPause	Tickspan	1660708
name	GCName	G1New
startTime	long: millis	33494513792
sumOfPauses	Tickspan	1660708

ParallelOldGarbageCollection

default profiling startTime duration 11 17 21 23 24

Category: Java Virtual Machine / GC / Collector

Appearing in: ParallelGC

Missing in: G1GC, SerialGC, ShenandoahGC, ZGC

Extra information specific to Parallel Old Garbage Collections

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

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

Examples 1

ParallelGC

densePrefix	ulong: address	30065819648
gcId	uint	56
startTime	long: millis	31430549042

YoungGarbageCollection

default profiling startTime duration 11 17 21 23 24

Category: Java Virtual Machine / GC / Collector

Appearing in: G1GC, ParallelGC, SerialGC

Missing in: ShenandoahGC, ZGC

Extra information specific to Young Garbage Collections

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
gcId	uint	GC Identifier
tenuringThreshold	uint	Tenuring Threshold

Examples 3

gcId	uint	22
startTime	long: millis	1859718833
tenuringThreshold	uint	4

gcId	uint	28
startTime	long: millis	7657098250
tenuringThreshold	uint	15

gcId	uint	48
startTime	long: millis	28324881833
tenuringThreshold	uint	13

OldGarbageCollection

default profiling startTime duration 11 17 21 23 24

Category: Java Virtual Machine / GC / Collector

Appearing in: G1GC, ParallelGC, SerialGC

Missing in: ShenandoahGC, ZGC

Extra information specific to Old Garbage Collections

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
gcId	uint	GC Identifier

Examples 3

gcId	uint	136
startTime	long: millis	47694342542

gcId	uint	65
startTime	long: millis	45193051333

gcId	uint	281
startTime	long: millis	62070880917

G1GarbageCollection

default profiling startTime duration 11 17 21 23 24

Category: Java Virtual Machine / GC / Collector

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

Extra information specific to G1 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	87
startTime	long: millis	30486050750
type	G1YCType	Normal

JVM: GC: Configuration

GCConfiguration

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

Category: Java Virtual Machine / GC / Configuration

The configuration of the garbage collector

Configuration	enabled	period
default	true	everyChunk
profiling	true	everyChunk

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

Examples 3

concurrentGCThreads	uint	2
gcTimeRatio	uint	12
isExplicitGCConcurrent	boolean	false
isExplicitGCDisabled	boolean	false
oldCollector	GCName	G1Old
parallelGCThreads	uint	8
pauseTarget	long: millis	-9223372036854775808
startTime	long: millis	50973329125
usesDynamicGCThreads	boolean	true
youngCollector	GCName	G1New

concurrentGCThreads	uint	0
gcTimeRatio	uint	99
isExplicitGCConcurrent	boolean	false
isExplicitGCDisabled	boolean	false
oldCollector	GCName	SerialOld
parallelGCThreads	uint	0
pauseTarget	long: millis	-9223372036854775808
startTime	long: millis	76136276083
usesDynamicGCThreads	boolean	true
youngCollector	GCName	DefNew

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

GCSurvivorConfiguration

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

Category: Java Virtual Machine / GC / Configuration

The configuration of the survivors of garbage collection

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

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

Examples 3

initialTenuringThreshold	ubyte	7
maxTenuringThreshold	ubyte	15
startTime	long: millis	40220267458

initialTenuringThreshold	ubyte	7
maxTenuringThreshold	ubyte	15
startTime	long: millis	79064864500

initialTenuringThreshold	ubyte	7
maxTenuringThreshold	ubyte	15
startTime	long: millis	22231099042

GCTLABConfiguration

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

Category: Java Virtual Machine / GC / Configuration

The configuration of the Thread Local Allocation Buffers (TLABs)

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

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

Examples 3

minTLABSize	ulong: bytes	2048
startTime	long: millis	52241833875
tlabRefillWasteLimit	ulong: bytes	64
usesTLABs	boolean	true

minTLABSize	ulong: bytes	2048
startTime	long: millis	22231100042
tlabRefillWasteLimit	ulong: bytes	64
usesTLABs	boolean	true

minTLABSize	ulong: bytes	2048
startTime	long: millis	75222450083
tlabRefillWasteLimit	ulong: bytes	64
usesTLABs	boolean	true

GCHeapConfiguration

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

Category: Java Virtual Machine / GC / Configuration

The configuration of the garbage collected heap

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

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

Examples 3

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

compressedOopsMode	NarrowOopMode	Zero based
heapAddressBits	ubyte	32
initialSize	ulong: bytes	268435456
maxSize	ulong: bytes	4294967296
minSize	ulong: bytes	8388608
objectAlignment	ulong: bytes	8
startTime	long: millis	22231100584
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	93887424333
usesCompressedOops	boolean	true

YoungGenerationConfiguration

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

Category: Java Virtual Machine / GC / Configuration

The configuration of the young generation of the garbage collected heap

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

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

Examples 3

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

maxSize	ulong: bytes	2575302656
minSize	ulong: bytes	1363144
newRatio	uint	2
startTime	long: millis	22231101959

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

JVM: GC: Detailed

G1MMU

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

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

Configuration	enabled
default	true
profiling	true

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

Examples 1

G1GC

gcId	uint	93
gcTime	long: millis	1
pauseTarget	long: millis	200
startTime	long: millis	32681114375
timeSlice	long: millis	201

EvacuationInformation

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

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

Configuration	enabled
default	true
profiling	true

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

Examples 1

G1GC

allocationRegions	uint	46
allocationRegionsUsedAfter	ulong: bytes	95420416
allocationRegionsUsedBefore	ulong: bytes	0
bytesCopied	ulong: bytes	95420416
cSetRegions	uint	636
cSetUsedAfter	ulong: bytes	0
cSetUsedBefore	ulong: bytes	1332740096
gcId	uint	46
regionsFreed	uint	636
startTime	long: millis	14492923292

ObjectCountAfterGC

startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC, ParallelGC, SerialGC

Missing in: ShenandoahGC, ZGC

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

Configuration	enabled
default	false
profiling	false

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

Examples 3

count	long	780
gcId	uint	1
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	jdk/jfr/ValueDescriptor
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
startTime	long: millis	431274583
totalSize	ulong: bytes	31200

count	long	292013
gcId	uint	34
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	java/util/HashMap$Node
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util
startTime	long: millis	8979422834
totalSize	ulong: bytes	9344416

count	long	79944
gcId	uint	69
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/util/LinkedList
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util
startTime	long: millis	8663866792
totalSize	ulong: bytes	2558208

G1EvacuationYoungStatistics

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

Memory related evacuation statistics during GC for the young generation

Configuration	enabled
default	true
profiling	true

Field	Type	Description
statistics	G1EvacuationStatistics struct	Evacuation Statistics

Examples 1

G1GC

startTime	long: millis	22316166084
statistics	G1EvacuationStatistics
allocated	ulong: bytes	700040
directAllocated	ulong: bytes	9875184
failureUsed	ulong: bytes	0
failureWaste	ulong: bytes	0
gcId	uint	67
regionEndWaste	ulong: bytes	212552
regionsRefilled	uint	6
undoWaste	ulong: bytes	0
used	ulong: bytes	636528
wasted	ulong: bytes	15056

G1EvacuationOldStatistics

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

Memory related evacuation statistics during GC for the old generation

Configuration	enabled
default	true
profiling	true

Field	Type	Description
statistics	G1EvacuationStatistics struct	Evacuation Statistics

Examples 1

G1GC

startTime	long: millis	23530790042
statistics	G1EvacuationStatistics
allocated	ulong: bytes	0
directAllocated	ulong: bytes	0
failureUsed	ulong: bytes	0
failureWaste	ulong: bytes	0
gcId	uint	75
regionEndWaste	ulong: bytes	0
regionsRefilled	uint	0
undoWaste	ulong: bytes	0
used	ulong: bytes	0
wasted	ulong: bytes	0

G1BasicIHOP

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

Basic statistics related to current IHOP calculation

Configuration	enabled
default	true
profiling	true

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

Examples 1

G1GC

currentOccupancy	ulong: bytes	519377608
gcId	uint	117
lastMarkingDuration	long: millis	880
recentAllocationRate	double: bytes-per-second	1.0198903803517283E9
recentMutatorAllocationSize	ulong: bytes	111149056
recentMutatorDuration	long: millis	108
startTime	long: millis	40597543292
targetOccupancy	ulong: bytes	729808896
threshold	ulong: bytes	328414003
thresholdPercentage	float: percentage	0.45

G1AdaptiveIHOP

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

Statistics related to current adaptive IHOP calculation

Configuration	enabled
default	true
profiling	true

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

Examples 1

G1GC

additionalBufferSize	ulong: bytes	83886080
currentOccupancy	ulong: bytes	6513440
gcId	uint	6
ihopTargetOccupancy	ulong: bytes	135476019
predictedAllocationRate	double: bytes-per-second	8434366.22359905
predictedMarkingDuration	long: millis	0
predictionActive	boolean	false
startTime	long: millis	1433724834
threshold	ulong: bytes	64172851
thresholdPercentage	float: percentage	0.47368422

PromoteObjectInNewPLAB

profiling startTime eventThread 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC, ParallelGC

Missing in: SerialGC, ShenandoahGC, ZGC

Object survived scavenge and was copied to a new Promotion Local Allocation Buffer (PLAB). Supported GCs are Parallel Scavange, 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 scavange 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	32
plabSize	ulong: bytes	32752
startTime	long: millis	1161462542
tenured	boolean	false
tenuringAge	uint	1

gcId	uint	3
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/util/LinkedHashMap
package	Package
exported	boolean	true
module	Module
classLoader	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
objectSize	ulong: bytes	64
plabSize	ulong: bytes	12032
startTime	long: millis	940157167
tenured	boolean	true
tenuringAge	uint	1

PromoteObjectOutsidePLAB

profiling startTime eventThread 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC, ParallelGC

Missing in: SerialGC, ShenandoahGC, ZGC

Object survived scavenge and was copied directly to the heap. Supported GCs are Parallel Scavange, 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 scavange 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

G1GC
ParallelGC

gcId	uint	9
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	0
name	string	[C
package	Package	null
objectSize	ulong: bytes	16400
startTime	long: millis	1606487459
tenured	boolean	true
tenuringAge	uint	0

gcId	uint	2
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	0
name	string	[Ljava/util/concurrent/ConcurrentHashMap$Node;
package	Package
exported	boolean	true
module	Module
classLoader	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
objectSize	ulong: bytes	262160
startTime	long: millis	967815583
tenured	boolean	false
tenuringAge	uint	0

PromotionFailed

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Promotion of an object failed

Configuration	enabled
default	true
profiling	true

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

EvacuationFailed

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Evacuation of an object failed

Configuration	enabled
default	true
profiling	true

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

ConcurrentModeFailure

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Concurrent Mode failed

Configuration	enabled
default	true
profiling	true

Field	Type	Description
gcId	uint	GC Identifier

AllocationRequiringGC

startTime eventThread stackTrace 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC, ParallelGC, SerialGC

Missing in: ShenandoahGC, ZGC

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

Configuration	enabled	stackTrace
default	false	true
profiling	false	true

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

Examples 3

gcId	uint	5
size	ulong: bytes	18616
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	1004476375

gcId	uint	28
size	ulong: bytes	80
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	133
lineNumber	int	710
method	Method
descriptor	string	()[Ljava/util/HashMap$Node;
hidden	boolean	false
modifiers	int	16
name	string	resize
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/util/HashMap
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util
type	FrameType	JIT compiled
		…
truncated	boolean	false
startTime	long: millis	1933919000

gcId	uint	63
size	ulong: bytes	24
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	5
lineNumber	int	483
method	Method
descriptor	string	(Lcom/twitter/util/Future;)V
hidden	boolean	false
modifiers	int	1
name	string	<init>
type	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/net
hidden	boolean	false
modifiers	int	33
name	string	com/twitter/util/Promise
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	JIT compiled
		…
truncated	boolean	false
startTime	long: millis	42081410875

TenuringDistribution

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC, SerialGC

Missing in: ParallelGC, ShenandoahGC, ZGC

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

Configuration	enabled
default	true
profiling	true

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

Examples 2

SerialGC
G1GC

age	uint	15
gcId	uint	17
size	ulong: bytes	0
startTime	long: millis	1795047875

age	uint	1
gcId	uint	4
size	ulong: bytes	82264
startTime	long: millis	977804375

G1HeapRegionTypeChange

startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

Information about a G1 heap region type change

Configuration	enabled
default	false
profiling	false

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

Examples 1

G1GC

from	G1HeapRegionType	Free
index	uint	26
start	ulong: address	30119297024
startTime	long: millis	690146125
to	G1HeapRegionType	Free
used	ulong: bytes	0

ObjectCount

startTime every chunk 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC, ParallelGC, SerialGC

Missing in: ShenandoahGC, ZGC

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

Configuration	enabled	period
default	false	everyChunk
profiling	false	everyChunk

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

Examples 3

count	long	341
gcId	uint	1
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/lang/invoke/MethodType
package	Package
exported	boolean	true
module	Module
classLoader	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/invoke
startTime	long: millis	431274583
totalSize	ulong: bytes	13640

count	long	1709
gcId	uint	0
objectClass	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
startTime	long: millis	372286000
totalSize	ulong: bytes	209664

count	long	9549
gcId	uint	1
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/lang/String
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
startTime	long: millis	684981625
totalSize	ulong: bytes	229176

G1HeapRegionInformation

startTime duration every chunk 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

Information about a specific heap region in the G1 GC

Configuration	enabled	period
default	false	everyChunk
profiling	false	everyChunk

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

Examples 1

G1GC

index	uint	4
start	ulong: address	30073159680
startTime	long: millis	692349292
type	G1HeapRegionType	Free
used	ulong: bytes	0

ZPageAllocation

experimental default profiling startTime duration eventThread 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: ZGC

Missing in: G1GC, ParallelGC, SerialGC, ShenandoahGC

Allocation of a ZPage

Configuration	enabled	threshold
default	true	10 ms
profiling	true	10 ms

Field	Type	Description
pageSize	ulong: bytes 11 until JDK 15	Page Size
usedAfter	ulong: bytes 11 until JDK 15	Used After
freeAfter	ulong: bytes 11 until JDK 15	Free After
inCacheAfter	ulong: bytes 11 until JDK 15	In Cache After
nonBlocking	boolean	Non-blocking
noReserve	boolean 11 until JDK 16	No Reserve

Examples 1

nonBlocking	boolean	false
startTime	long: millis	11682949416

ZThreadPhase

experimental default profiling startTime duration eventThread 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: ZGC

Missing in: G1GC, ParallelGC, SerialGC, ShenandoahGC

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

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
gcId	uint	GC Identifier
name	string	Name

Examples 1

gcId	uint	2
name	string	GC Locker Stall
startTime	long: millis	1034383708

ZStatisticsCounter

experimental default profiling startTime duration eventThread 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: ZGC

Missing in: G1GC, ParallelGC, SerialGC, ShenandoahGC

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

Configuration	enabled	threshold
default	true	10 ms
profiling	true	10 ms

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

Examples 1

id	ZStatisticsCounterType	Page Cache Miss
increment	ulong	1
startTime	long: millis	1047762375
value	ulong	29

ZStatisticsSampler

experimental default profiling startTime duration eventThread 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: ZGC

Missing in: G1GC, ParallelGC, SerialGC, ShenandoahGC

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

Configuration	enabled	threshold
default	true	10 ms
profiling	true	10 ms

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

Examples 1

id	ZStatisticsSamplerType	Concurrent Roots JavaThreads
startTime	long: millis	745388125
value	ulong	319041

ShenandoahHeapRegionStateChange

startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: ShenandoahGC

Missing in: G1GC, ParallelGC, SerialGC, ZGC

Information about a Shenandoah heap region state change

Configuration	enabled
default	false
profiling	false

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

Examples 1

ShenandoahGC

from	ShenandoahHeapRegionState	Trash
index	uint	4
start	ulong: address	30073159680
startTime	long: millis	817495542
to	ShenandoahHeapRegionState	Empty Committed
used	ulong: bytes	0

ShenandoahHeapRegionInformation

startTime duration every chunk 11 17 21 23 24

Category: Java Virtual Machine / GC / Detailed

Appearing in: ShenandoahGC

Missing in: G1GC, ParallelGC, SerialGC, ZGC

Information about a specific heap region in the Shenandoah GC

Configuration	enabled	period
default	false	everyChunk
profiling	false	everyChunk

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

Examples 1

ShenandoahGC

index	uint	17
start	ulong: address	30100422656
startTime	long: millis	363233833
state	ShenandoahHeapRegionState	Empty Committed
used	ulong: bytes	0

JVM: GC: Heap

GCHeapSummary

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Heap

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

Configuration	enabled
default	true
profiling	true

Field	Type	Description
gcId	uint	GC Identifier
when	GCWhen	When Consider contributing a description to jfreventcollector.
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	21
heapSpace	VirtualSpace
committedEnd	ulong: address	30691819520
committedSize	ulong: bytes	627048448
reservedEnd	ulong: address	34359738368
reservedSize	ulong: bytes	4294967296
start	ulong: address	30064771072
heapUsed	ulong: bytes	105705440
startTime	long: millis	2727309625
when	GCWhen	After GC

gcId	uint	9
heapSpace	VirtualSpace
committedEnd	ulong: address	30549737472
committedSize	ulong: bytes	484966400
reservedEnd	ulong: address	34359738368
reservedSize	ulong: bytes	4294967296
start	ulong: address	30064771072
heapUsed	ulong: bytes	79145128
startTime	long: millis	1497605500
when	GCWhen	After GC

gcId	uint	16
heapSpace	VirtualSpace
committedEnd	ulong: address	30324359168
committedSize	ulong: bytes	259588096
reservedEnd	ulong: address	34359738368
reservedSize	ulong: bytes	4294967296
start	ulong: address	30064771072
heapUsed	ulong: bytes	94123448
startTime	long: millis	1777513250
when	GCWhen	After GC

MetaspaceSummary

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Heap

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

Configuration	enabled
default	true
profiling	true

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

Examples 3

classSpace	MetaspaceSizes
committed	ulong: bytes	2686976
reserved	ulong: bytes	1073741824
used	ulong: bytes	2530200
dataSpace	MetaspaceSizes
committed	ulong: bytes	21168128
reserved	ulong: bytes	67108864
used	ulong: bytes	20983624
gcId	uint	19
gcThreshold	ulong: bytes	38469632
metaspace	MetaspaceSizes
committed	ulong: bytes	23855104
reserved	ulong: bytes	1140850688
used	ulong: bytes	23513824
startTime	long: millis	2468289000
when	GCWhen	Before GC

classSpace	MetaspaceSizes
committed	ulong: bytes	4849664
reserved	ulong: bytes	1073741824
used	ulong: bytes	4724920
dataSpace	MetaspaceSizes
committed	ulong: bytes	36175872
reserved	ulong: bytes	67108864
used	ulong: bytes	36012336
gcId	uint	41
gcThreshold	ulong: bytes	68812800
metaspace	MetaspaceSizes
committed	ulong: bytes	41025536
reserved	ulong: bytes	1140850688
used	ulong: bytes	40737256
startTime	long: millis	26357305208
when	GCWhen	After GC

classSpace	MetaspaceSizes
committed	ulong: bytes	2490368
reserved	ulong: bytes	1073741824
used	ulong: bytes	2421352
dataSpace	MetaspaceSizes
committed	ulong: bytes	20512768
reserved	ulong: bytes	67108864
used	ulong: bytes	20385384
gcId	uint	7
gcThreshold	ulong: bytes	36700160
metaspace	MetaspaceSizes
committed	ulong: bytes	23003136
reserved	ulong: bytes	1140850688
used	ulong: bytes	22806736
startTime	long: millis	1228280542
when	GCWhen	Before GC

PSHeapSummary

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Heap

Appearing in: ParallelGC

Missing in: G1GC, SerialGC, ShenandoahGC, ZGC

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

Configuration	enabled
default	true
profiling	true

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

Examples 1

ParallelGC

edenSpace	ObjectSpace
end	ulong: address	32995540992
size	ulong: bytes	67108864
start	ulong: address	32928432128
used	ulong: bytes	0
fromSpace	ObjectSpace
end	ulong: address	33017561088
size	ulong: bytes	11010048
start	ulong: address	33006551040
used	ulong: bytes	0
gcId	uint	3
oldObjectSpace	ObjectSpace
end	ulong: address	30244077568
size	ulong: bytes	179306496
start	ulong: address	30064771072
used	ulong: bytes	6441064
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	986250417
toSpace	ObjectSpace
end	ulong: address	33006551040
size	ulong: bytes	11010048
start	ulong: address	32995540992
used	ulong: bytes	0
when	GCWhen	After GC
youngSpace	VirtualSpace
committedEnd	ulong: address	33017561088
committedSize	ulong: bytes	89128960
reservedEnd	ulong: address	34359738368
reservedSize	ulong: bytes	1431306240
start	ulong: address	32928432128

G1HeapSummary

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Heap

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

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

Configuration	enabled
default	true
profiling	true

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

Examples 1

G1GC

edenTotalSize	ulong: bytes	306184192
edenUsedSize	ulong: bytes	304087040
gcId	uint	35
numberOfRegions	uint	407
startTime	long: millis	9052179042
survivorUsedSize	ulong: bytes	16777216
when	GCWhen	Before GC

JVM: GC: Metaspace

MetaspaceGCThreshold

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Metaspace

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

Configuration	enabled
default	true
profiling	true

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

Examples 3

newValue	ulong: bytes	43057152
oldValue	ulong: bytes	38338560
startTime	long: millis	4601069417
updater	GCThresholdUpdater	compute_new_size

newValue	ulong: bytes	139067392
oldValue	ulong: bytes	129236992
startTime	long: millis	36565660125
updater	GCThresholdUpdater	compute_new_size

newValue	ulong: bytes	38338560
oldValue	ulong: bytes	36700160
startTime	long: millis	1409235667
updater	GCThresholdUpdater	compute_new_size

MetaspaceAllocationFailure

default profiling startTime stackTrace 11 17 21 23 24

Category: Java Virtual Machine / GC / Metaspace

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

Configuration	enabled	stackTrace
default	true	true
profiling	true	true

Field	Type	Description
classLoader	ClassLoader	Class Loader Consider contributing a description to jfreventcollector.
anonymousClassLoader	boolean 11 until JDK 12	Anonymous 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
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
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
metadataType	MetadataType	Metadata
metaspaceObjectType	MetaspaceObjectType	Method
size	ulong: bytes	88
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	(Ljava/lang/ClassLoader;Ljava/lang/String;[BIILjava/security/ProtectionDomain;Ljava/lang/String;)Ljava/lang/Class;
hidden	boolean	false
modifiers	int	264
name	string	defineClass1
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	1057
name	string	java/lang/ClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	858453667

MetaspaceOOM

default profiling startTime stackTrace 11 17 21 23 24

Category: Java Virtual Machine / GC / Metaspace

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

Configuration	enabled	stackTrace
default	true	true
profiling	true	true

Field	Type	Description
classLoader	ClassLoader	Class Loader Consider contributing a description to jfreventcollector.
anonymousClassLoader	boolean 11 until JDK 12	Anonymous Class Loader
size	ulong: bytes	Size
metadataType	MetadataType	Metadata Type Consider contributing a description to jfreventcollector.
metaspaceObjectType	MetaspaceObjectType	Metaspace Object Type Consider contributing a description to jfreventcollector.

MetaspaceChunkFreeListSummary

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Metaspace

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

Configuration	enabled
default	true
profiling	true

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

Examples 3

gcId	uint	23
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	10970345375
when	GCWhen	Before 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	1826468917
when	GCWhen	After GC

gcId	uint	18
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	2403967000
when	GCWhen	After GC

JVM: GC: Phases

GCPhasePause

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

Category: Java Virtual Machine / GC / Phases

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

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
gcId	uint	GC Identifier
name	string	Name

Examples 3

gcId	uint	41
name	string	GC Pause
startTime	long: millis	11282301917

gcId	uint	58
name	string	GC Pause
startTime	long: millis	38452683542

gcId	uint	87
name	string	GC Pause
startTime	long: millis	13957811625

GCPhasePauseLevel1

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

Category: Java Virtual Machine / GC / Phases

Appearing in: G1GC, ParallelGC, SerialGC, ShenandoahGC

Missing in: ZGC

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

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
gcId	uint	GC Identifier
name	string	Name

Examples 3

gcId	uint	22
name	string	Notify Soft/WeakReferences
startTime	long: millis	1865684875

gcId	uint	6
name	string	Notify and keep alive finalizable
startTime	long: millis	1433022292

gcId	uint	13
name	string	Weak Processing
startTime	long: millis	2098671958

GCPhasePauseLevel2

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

Category: Java Virtual Machine / GC / Phases

Appearing in: G1GC, ParallelGC, SerialGC

Missing in: ShenandoahGC, ZGC

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

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
gcId	uint	GC Identifier
name	string	Name

Examples 3

gcId	uint	14
name	string	Notify Soft/WeakReferences
startTime	long: millis	2190437042

gcId	uint	69
name	string	Report Object Count
startTime	long: millis	8601625833

gcId	uint	7
name	string	Notify and keep alive finalizable
startTime	long: millis	1440264792

GCPhasePauseLevel3

startTime duration eventThread 11 17 21 23 24 graal vm

Category: Java Virtual Machine / GC / Phases

Appearing in: G1GC, ParallelGC, SerialGC

Missing in: ShenandoahGC, ZGC

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

Configuration	enabled	threshold
default	false	0 ms
profiling	false	0 ms

Field	Type	Description
gcId	uint	GC Identifier
name	string	Name

Examples 3

gcId	uint	61
name	string	Notify Soft/WeakReferences
startTime	long: millis	6479008042

gcId	uint	126
name	string	Trigger cleanups
startTime	long: millis	45667926084

gcId	uint	56
name	string	Trigger cleanups
startTime	long: millis	31496658875

GCPhasePauseLevel4

startTime duration eventThread 11 17 21 23 24 graal vm

Category: Java Virtual Machine / GC / Phases

Appearing in: G1GC, ParallelGC

Missing in: SerialGC, ShenandoahGC, ZGC

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

Configuration	enabled	threshold
default	false	0 ms
profiling	false	0 ms

Field	Type	Description
gcId	uint	GC Identifier
name	string	Name

Examples 2

G1GC
ParallelGC

gcId	uint	202
name	string	Balance queues
startTime	long: millis	57165633959

gcId	uint	119
name	string	Balance queues
startTime	long: millis	93633924917

GCPhaseConcurrent

default profiling startTime duration eventThread 11 17 21 23 24

Category: Java Virtual Machine / GC / Phases

Appearing in: G1GC, ShenandoahGC, ZGC

Missing in: ParallelGC, SerialGC

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

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
gcId	uint	GC Identifier
name	string	Name

Examples 3

gcId	uint	2
name	string	Concurrent reset
startTime	long: millis	1970823917

gcId	uint	175
name	string	Concurrent Clear Claimed Marks
startTime	long: millis	53407300209

gcId	uint	5
name	string	Concurrent Process Non-Strong References
startTime	long: millis	2332170750

JVM: GC: Reference

GCReferenceStatistics

default profiling startTime 11 17 21 23 24

Category: Java Virtual Machine / GC / Reference

Total count of processed references during GC

Configuration	enabled
default	true
profiling	true

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

Examples 3

count	ulong	0
gcId	uint	18
startTime	long: millis	2403755709
type	ReferenceType	Soft reference

count	ulong	0
gcId	uint	18
startTime	long: millis	1807677125
type	ReferenceType	Final reference

count	ulong	321
gcId	uint	0
startTime	long: millis	426176917
type	ReferenceType	Weak reference

JVM: Profiling

OldObjectSample

cutoff default profiling startTime eventThread stackTrace 11 17 21 23 24

Category: Java Virtual Machine / Profiling

A potential memory leak

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

Field	Type	Description
allocationTime	Ticks	Allocation Time Consider contributing a description to jfreventcollector.
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	77541736750
arrayElements	int	8192
lastKnownHeapUsage	ulong: bytes	123629408
object	OldObject
address	ulong: address	30252583000
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/ConcurrentHashMap$Node;
package	Package
exported	boolean	true
module	Module
classLoader	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
root	OldObjectGcRoot	null
stackTrace	StackTrace	null
startTime	long: millis	78000525209

allocationTime	Ticks	78193205417
arrayElements	int	-2147483648
lastKnownHeapUsage	ulong: bytes	121406312
object	OldObject
address	ulong: address	30171738800
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/lang/invoke/BoundMethodHandle$Species_LL
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang/invoke
root	OldObjectGcRoot	null
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	(Ljava/lang/invoke/MethodType;Ljava/lang/invoke/LambdaForm;Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/invoke/BoundMethodHandle;
hidden	boolean	false
modifiers	int	8
name	string	make
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	48
name	string	java/lang/invoke/BoundMethodHandle$Species_LL
package	Package
exported	boolean	true
module	Module
classLoader	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/invoke
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	94066910250

allocationTime	Ticks	38284319625
arrayElements	int	6
lastKnownHeapUsage	ulong: bytes	132764920
object	OldObject
address	ulong: address	31579891536
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/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
root	OldObjectGcRoot	null
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	4
lineNumber	int	328
method	Method
descriptor	string	(Ljava/util/concurrent/SynchronousQueue$TransferStack$SNode;Ljava/lang/Object;Ljava/util/concurrent/SynchronousQueue$TransferStack$SNode;I)Ljava/util/concurrent/SynchronousQueue$TransferStack$SNode;
hidden	boolean	false
modifiers	int	8
name	string	snode
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	48
name	string	java/util/concurrent/SynchronousQueue$TransferStack
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util/concurrent
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	98967997708

ExecutionSample

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

Category: Java Virtual Machine / Profiling

Snapshot of a threads state

Configuration	enabled	period
default	true	20 ms
profiling	true	10 ms

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

Examples 3

sampledThread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	ForkJoinPool.commonPool-worker-4
javaThreadId	long	34
osName	string	ForkJoinPool.commonPool-worker-4
osThreadId	long	26115
virtual	boolean	false
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	25
lineNumber	int	151
method	Method
descriptor	string	()Z
hidden	boolean	false
modifiers	int	1
name	string	isValid
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/DoubleGene
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
type	FrameType	Inlined
		…
truncated	boolean	false
startTime	long: millis	4871492125
state	ThreadState	STATE_RUNNABLE

sampledThread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	ForkJoinPool.commonPool-worker-2
javaThreadId	long	37
osName	string	ForkJoinPool.commonPool-worker-2
osThreadId	long	42499
virtual	boolean	false
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	12
lineNumber	int	501
method	Method
descriptor	string	(Ljava/lang/Object;)Ljava/lang/Object;
hidden	boolean	false
modifiers	int	8
name	string	allocateInstance
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	java/lang/invoke/DirectMethodHandle
package	Package
exported	boolean	true
module	Module
classLoader	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/invoke
type	FrameType	Inlined
		…
truncated	boolean	false
startTime	long: millis	2508950750
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	127
lineNumber	int	946
method	Method
descriptor	string	(Ljava/lang/Object;)Ljava/lang/Object;
hidden	boolean	false
modifiers	int	1
name	string	get
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/util/concurrent/ConcurrentHashMap
package	Package
exported	boolean	true
module	Module
classLoader	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	JIT compiled
		…
truncated	boolean	false
startTime	long: millis	2725435292
state	ThreadState	STATE_RUNNABLE

NativeMethodSample

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

Category: Java Virtual Machine / Profiling

Snapshot of a threads state when in native

Configuration	enabled	period
default	true	20 ms
profiling	true	20 ms

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

Examples 3

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

sampledThread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	main
javaThreadId	long	1
osName	string	main
osThreadId	long	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	3103453750
state	ThreadState	STATE_RUNNABLE

sampledThread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	main
javaThreadId	long	1
osName	string	main
osThreadId	long	8451
virtual	boolean	false
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	([BII)I
hidden	boolean	false
modifiers	int	258
name	string	readBytes0
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/io/RandomAccessFile
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/io
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	4687058375
state	ThreadState	STATE_RUNNABLE

JVM: Runtime

BiasedLockRevocation

default profiling startTime duration eventThread stackTrace 11 17 until JDK 18

Category: Java Virtual Machine / Runtime

Revoked bias of object

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

Field	Type	Description
lockClass	Class	Lock Class Class of object whose biased lock was revoked
safepointId	int	Safepoint Identifier
previousOwner	Thread	Previous Owner Thread owning the bias before revocation

BiasedLockSelfRevocation

default profiling startTime duration eventThread stackTrace 11 17 until JDK 18

Category: Java Virtual Machine / Runtime

Revoked bias of object biased towards own thread

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

Field	Type	Description
lockClass	Class	Lock Class Class of object whose biased lock was revoked

BiasedLockClassRevocation

default profiling startTime duration eventThread stackTrace 11 17 until JDK 18

Category: Java Virtual Machine / Runtime

Revoked biases for all instances of a class

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

Field	Type	Description
revokedClass	Class	Revoked Class Class whose biased locks were revoked
disableBiasing	boolean	Disable Further Biasing Whether further biasing for instances of this class will be allowed
safepointId	int	Safepoint Identifier

ReservedStackActivation

default profiling startTime eventThread stackTrace 11 17 21 23 24

Category: Java Virtual Machine / Runtime

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

Configuration	enabled	stackTrace
default	true	true
profiling	true	true

Field	Type	Description
method	Method	Java Method

SafepointBegin

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

Category: Java Virtual Machine / Runtime / Safepoint

Safepointing begin

Configuration	enabled	threshold
default	true	10 ms
profiling	true	0 ms

Field	Type	Description
safepointId	int	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	int	80
startTime	long: millis	6015789542
totalThreadCount	int	28

jniCriticalThreadCount	int	0
safepointId	int	9
startTime	long: millis	676363750
totalThreadCount	int	11

jniCriticalThreadCount	int	0
safepointId	int	7
startTime	long: millis	422690083
totalThreadCount	int	12

SafepointStateSynchronization

startTime duration eventThread 11 17 21 23 24

Category: Java Virtual Machine / Runtime / Safepoint

Synchronize run state of threads

Configuration	enabled	threshold
default	false	10 ms
profiling	false	0 ms

Field	Type	Description
safepointId	int	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	0
iterations	int	1
runningThreadCount	int	0
safepointId	int	68
startTime	long: millis	5004816917

initialThreadCount	int	3
iterations	int	3
runningThreadCount	int	0
safepointId	int	60
startTime	long: millis	8705425208

initialThreadCount	int	3
iterations	int	4
runningThreadCount	int	0
safepointId	int	37
startTime	long: millis	2600149209

SafepointWaitBlocked

startTime duration eventThread 11 until JDK 13

Category: Java Virtual Machine / Runtime / Safepoint

Safepointing begin waiting on running threads to block

Configuration	enabled	threshold
default	false	10 ms
profiling	false	0 ms

Field	Type	Description
safepointId	int	Safepoint Identifier
runningThreadCount	int	Running Threads The number running of threads wait for safe point

SafepointCleanup

startTime duration eventThread 11 17 21 until JDK 23

Category: Java Virtual Machine / Runtime / Safepoint

Safepointing begin running cleanup tasks

Configuration	enabled	threshold
default	false	10 ms
profiling	false	0 ms

Field	Type	Description
safepointId	int	Safepoint Identifier

Examples 3

safepointId	int	41
startTime	long: millis	1897625417

safepointId	int	59
startTime	long: millis	8104768500

safepointId	int	49
startTime	long: millis	7233362375

SafepointCleanupTask

startTime duration eventThread 11 17 21 until JDK 23

Category: Java Virtual Machine / Runtime / Safepoint

Safepointing begin running cleanup tasks

Configuration	enabled	threshold
default	false	10 ms
profiling	false	0 ms

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

Examples 3

name	string	updating inline caches
safepointId	int	9
startTime	long: millis	676394167

name	string	updating inline caches
safepointId	int	9
startTime	long: millis	737096292

name	string	updating inline caches
safepointId	int	12
startTime	long: millis	1060588333

SafepointEnd

startTime duration eventThread 11 17 21 23 24 graal vm

Category: Java Virtual Machine / Runtime / Safepoint

Safepointing end

Configuration	enabled	threshold
default	false	10 ms
profiling	false	0 ms

Field	Type	Description
safepointId	int	Safepoint Identifier

Examples 3

safepointId	int	62
startTime	long: millis	8751952875

safepointId	int	41
startTime	long: millis	4854535750

safepointId	int	84
startTime	long: millis	6995930083

ExecuteVMOperation

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

Category: Java Virtual Machine / Runtime

Execution of a VM Operation

Configuration	enabled	threshold
default	true	10 ms
profiling	true	0 ms

Field	Type	Description
operation	VMOperationType	Operation Consider contributing a description to jfreventcollector.
safepoint	boolean	At Safepoint If the operation occured 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	int	Safepoint Identifier The safepoint (if any) under which this operation was completed

Examples 3

blocking	boolean	true
caller	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	ForkJoinPool.commonPool-worker-5
javaThreadId	long	27
osName	string	ForkJoinPool.commonPool-worker-5
osThreadId	long	26627
virtual	boolean	false
operation	VMOperationType	GenCollectForAllocation
safepoint	boolean	true
safepointId	int	38
startTime	long: millis	1859695042

blocking	boolean	true
caller	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	ForkJoinPool.commonPool-worker-7
javaThreadId	long	42
osName	string	ForkJoinPool.commonPool-worker-7
osThreadId	long	40707
virtual	boolean	false
operation	VMOperationType	G1CollectForAllocation
safepoint	boolean	true
safepointId	int	37
startTime	long: millis	2600206875

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-15
javaThreadId	long	113
osName	string	UCT-akka.actor.default-dispatcher-15
osThreadId	long	34059
virtual	boolean	false
operation	VMOperationType	ParallelGCFailedAllocation
safepoint	boolean	true
safepointId	int	79
startTime	long: millis	10970329750

Shutdown

default profiling startTime eventThread stackTrace 11 17 21 23 24

Category: Java Virtual Machine / Runtime

JVM shutting down

Configuration	enabled	stackTrace
default	true	true
profiling	true	true

Field	Type	Description
reason	string	Reason Reason for JVM shutdown

Examples 3

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

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

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

ThreadDump

default profiling startTime duration every chunk 11 17 21 23 24

Category: Java Virtual Machine / Runtime

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

Configuration	enabled	period
default	true	everyChunk
profiling	true	60 s

Field	Type	Description
result	string	Thread Dump

Examples 3

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

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

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

NativeLibrary

default profiling startTime every chunk 11 17 21 23 24

Category: Java Virtual Machine / Runtime

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

Configuration	enabled	period
default	true	everyChunk
profiling	true	everyChunk

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

Examples 3

baseAddress	ulong: address	6707646464
name	string	/System/Library/PrivateFrameworks/CoreUI.framework/Versions/A/CoreUI
startTime	long: millis	675848959
topAddress	ulong: address	0

baseAddress	ulong: address	7186423808
name	string	/usr/lib/swift/libswiftCoreImage.dylib
startTime	long: millis	364596583
topAddress	ulong: address	0

baseAddress	ulong: address	6657982464
name	string	/usr/lib/libenergytrace.dylib
startTime	long: millis	423214667
topAddress	ulong: address	0

ModuleRequire

default profiling startTime every chunk 11 17 21 23 24

Category: Java Virtual Machine / Runtime / Modules

A directed edge representing a dependency

Configuration	enabled	period
default	true	endChunk
profiling	true	endChunk

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

Examples 3

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

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

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

ModuleExport

default profiling startTime every chunk 11 17 21 23 24

Category: Java Virtual Machine / Runtime / Modules

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

Configuration	enabled	period
default	true	endChunk
profiling	true	endChunk

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

Examples 3

exportedPackage	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	platform
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	jdk/internal/loader/ClassLoaders$PlatformClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	jdk/internal/loader
location	string	jrt:/jdk.xml.dom
name	string	jdk.xml.dom
version	string	21.0.1
name	string	org/w3c/dom/xpath
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	akka/util
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	com/typesafe/config/parser
startTime	long: millis	14998523917
targetModule	Module	null

Java Application

ThreadStart

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

Category: Java Application

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

Configuration	enabled	stackTrace
default	true	true
profiling	true	true

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

Examples 3

parentThread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.internal-dispatcher-2
javaThreadId	long	99
osName	string	UCT-akka.actor.internal-dispatcher-2
osThreadId	long	42251
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	10801744333
thread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.default-dispatcher-7
javaThreadId	long	103
osName	string	UCT-akka.actor.default-dispatcher-7
osThreadId	long	65287
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-12
javaThreadId	long	134
osName	string	UCT-akka.actor.default-dispatcher-12
osThreadId	long	35847
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	11758720417
thread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.default-dispatcher-17
javaThreadId	long	139
osName	string	UCT-akka.actor.default-dispatcher-17
osThreadId	long	39175
virtual	boolean	false

parentThread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.internal-dispatcher-3
javaThreadId	long	114
osName	string	UCT-akka.actor.internal-dispatcher-3
osThreadId	long	61191
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	14739485083
thread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.default-dispatcher-18
javaThreadId	long	129
osName	string	UCT-akka.actor.default-dispatcher-18
osThreadId	long	64775
virtual	boolean	false

ThreadEnd

default profiling startTime eventThread 11 17 21 23 24 graal vm

Category: Java Application

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

Configuration	enabled
default	true
profiling	true

Field	Type	Description
thread	Thread	Java Thread

Examples 3

startTime	long: millis	13439019209
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	114
osName	string	UCT-akka.actor.default-dispatcher-16
osThreadId	long	85507
virtual	boolean	false

startTime	long: millis	15748919292
thread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.default-dispatcher-11
javaThreadId	long	131
osName	string	UCT-akka.actor.default-dispatcher-11
osThreadId	long	48135
virtual	boolean	false

startTime	long: millis	19795033583
thread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.default-dispatcher-10
javaThreadId	long	121
osName	string	UCT-akka.actor.default-dispatcher-10
osThreadId	long	62471
virtual	boolean	false

ThreadSleep

default profiling startTime duration eventThread stackTrace 11 17 21 until JDK 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
time	long: millis	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	7315194792
time	long: millis	7000000

stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	5
lineNumber	int	474
method	Method
descriptor	string	(Ljdk/internal/event/ThreadSleepEvent;)V
hidden	boolean	false
modifiers	int	10
name	string	afterSleep
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/Thread
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	9789046875
time	long: millis	9000000

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	7035177500
time	long: millis	7000000

ThreadPark

default profiling startTime duration eventThread stackTrace 11 17 21 23 24

Category: Java Application

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

Configuration	enabled	stackTrace	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	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	5563152042
timeout	long: nanos	-9223372036854775808
until	long: epochmillis	-9223372036854775808

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	8103695667
timeout	long: nanos	-9223372036854775808
until	long: epochmillis	-9223372036854775808

address	ulong: address	31586136128
parkedClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/util/concurrent/ForkJoinPool
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util/concurrent
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	(ZJ)V
hidden	boolean	false
modifiers	int	257
name	string	park
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	jdk/internal/misc/Unsafe
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	jdk/internal/misc
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	5433673458
timeout	long: nanos	-9223372036854775808
until	long: epochmillis	-9223372036854775808

JavaMonitorEnter

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

Category: Java Application

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

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

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

Examples 3

address	ulong: address	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-6
javaThreadId	long	53
osName	string	UCT-akka.actor.default-dispatcher-6
osThreadId	long	42247
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	7581482917

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-13
javaThreadId	long	68
osName	string	UCT-akka.actor.default-dispatcher-13
osThreadId	long	63491
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	9302735292

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-13
javaThreadId	long	55
osName	string	UCT-akka.actor.default-dispatcher-13
osThreadId	long	41219
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	7438901167

JavaMonitorWait

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

Category: Java Application

Waiting on a Java monitor

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

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

Examples 3

address	ulong: address	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
notifier	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.default-dispatcher-21
javaThreadId	long	119
osName	string	UCT-akka.actor.default-dispatcher-21
osThreadId	long	83459
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	10631176792
timedOut	boolean	false
timeout	long: millis	0

address	ulong: address	105553310729648
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-41
javaThreadId	long	374
osName	string	Thread-41
osThreadId	long	37423
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	66377335417
timedOut	boolean	false
timeout	long: millis	0

address	ulong: address	105553435769056
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-40
javaThreadId	long	369
osName	string	Thread-40
osThreadId	long	33555
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	76185911083
timedOut	boolean	false
timeout	long: millis	0

JavaMonitorInflate

profiling startTime duration eventThread stackTrace 11 17 21 23 24

Category: Java Application

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

Configuration	enabled	stackTrace	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

profiling startTime eventThread stackTrace 11 17 21 23 24

Category: Java Application

Allocation in new Thread Local Allocation Buffer

Configuration	enabled	stackTrace
default	false	true
profiling	true	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	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	null
startTime	long: millis	437999792
tlabSize	ulong: bytes	1342200

allocationSize	ulong: bytes	96
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	0
name	string	[I
package	Package	null
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	63
lineNumber	int	251
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	Inlined
		…
truncated	boolean	false
startTime	long: millis	1033016542
tlabSize	ulong: bytes	1394608

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	198
lineNumber	int	403
method	Method
descriptor	string	(Z[Z)Ljava/lang/String;
hidden	boolean	false
modifiers	int	2
name	string	implReadLine
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/io/BufferedReader
package	Package
exported	boolean	true
module	Module
classLoader	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	JIT compiled
		…
truncated	boolean	false
startTime	long: millis	1542795834
tlabSize	ulong: bytes	2048

ObjectAllocationOutsideTLAB

profiling startTime eventThread stackTrace 11 17 21 23 24

Category: Java Application

Allocation outside Thread Local Allocation Buffers

Configuration	enabled	stackTrace
default	false	true
profiling	true	true

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

Examples 3

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	19756734833

allocationSize	ulong: bytes	12064
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	0
name	string	[Ljava/lang/Object;
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	7
lineNumber	int	3513
method	Method
descriptor	string	([Ljava/lang/Object;ILjava/lang/Class;)[Ljava/lang/Object;
hidden	boolean	false
modifiers	int	9
name	string	copyOf
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/util/Arrays
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util
type	FrameType	JIT compiled
		…
truncated	boolean	false
startTime	long: millis	2009675458

allocationSize	ulong: bytes	14680
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	973713584

JavaErrorThrow

default profiling startTime duration stackTrace 11 17 21 until JDK 23

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

Category: Java Application

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

Configuration	enabled	stackTrace
default	true	true
profiling	true	true

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

Examples 3

message	string	'int java.lang.invoke.DirectMethodHandle$Holder.invokeStatic(java.lang.Object)'
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	19009631375
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	'int java.lang.invoke.DirectMethodHandle$Holder.invokeStatic(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	23306166708
thrownClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/NoSuchMethodError
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang

message	string	'java.lang.Object java.lang.invoke.Invokers$Holder.linkToTargetMethod(java.lang.Object, java.lang.Object, int, java.lang.Object)'
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	7
lineNumber	int	68
method	Method
descriptor	string	(Ljava/lang/String;)V
hidden	boolean	false
modifiers	int	1
name	string	<init>
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/Error
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang
type	FrameType	Interpreted
		…
truncated	boolean	false
startTime	long: millis	4040308208
thrownClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/NoSuchMethodError
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang

FileForce

default profiling startTime duration stackTrace 11 17 21 until JDK 23

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

Category: Java Application

Force updates to be written to file

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

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

SocketWrite

default profiling startTime duration stackTrace 11 17 21 until JDK 23

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

Category: Java Application

Writing data to a socket

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

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

Examples 3

address	string	127.0.0.1
bytesWritten	long: bytes	50
host	string
port	int	52658
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	45594863625

address	string	127.0.0.1
bytesWritten	long: bytes	25
host	string
port	int	52435
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	584
lineNumber	int	191
method	Method
descriptor	string	([Ljava/nio/ByteBuffer;II)J
hidden	boolean	false
modifiers	int	1
name	string	write
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	sun/nio/ch/SocketChannelImpl
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	sun/nio/ch
type	FrameType	JIT compiled
		…
truncated	boolean	false
startTime	long: millis	82244113917

address	string	127.0.0.1
bytesWritten	long: bytes	50
host	string
port	int	56508
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	33331135959

JavaExceptionThrow

startTime duration stackTrace 11 17 21 until JDK 23

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

Category: Java Application

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

Configuration	enabled	stackTrace
default	false	true
profiling	false	true

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

Examples 3

message	string	org.renaissance.harness.ConfigParser$$anon$1
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	925110417
thrownClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/ClassNotFoundException
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/lang

message	string	scala.collection.IndexedSeq
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	584001708
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	org.renaissance.harness.ConfigParser$$anon$1
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	683605583
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

FileWrite

default profiling startTime duration stackTrace 11 17 21 until JDK 23

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

Category: Java Application

Appearing in: G1GC, ParallelGC, ShenandoahGC, ZGC

Missing in: SerialGC

Writing data to a file

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

Field	Type	Description
path	string	Path Full path of the file
bytesWritten	long: bytes	Bytes Written Number of bytes written to the file

Examples 3

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

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

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

SocketRead

default profiling startTime duration stackTrace 11 17 21 until JDK 23

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

Category: Java Application

Reading data from a socket

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

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

Examples 3

address	string	127.0.0.1
bytesRead	long: bytes	50
endOfStream	boolean	false
host	string	localhost
port	int	56501
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	33412247334
timeout	long: millis	0

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	46587282750
timeout	long: millis	0

address	string	127.0.0.1
bytesRead	long: bytes	50
endOfStream	boolean	false
host	string	localhost
port	int	52288
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	42446498875
timeout	long: millis	0

FileRead

default profiling startTime duration stackTrace 11 17 21 until JDK 23

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

Category: Java Application

Appearing in: SerialGC, ZGC

Missing in: G1GC, ParallelGC, ShenandoahGC

Reading data from a file

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

Field	Type	Description
path	string	Path Full path of the file
bytesRead	long: bytes	Bytes Read Number of bytes read from the file (possibly 0)
endOfFile	boolean	End of File If end of file was reached

Examples 2

ZGC
SerialGC

bytesRead	long: bytes	4
endOfFile	boolean	false
path	string	[...]/code/experiments/jfreventcollector/harness-124931-6974251686310067154/apache-spark/lib/activation-1.1.1.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	30609363666

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

Java Application Statistics

JavaThreadStatistics

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

Category: Java Application / Statistics

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

Configuration	enabled	period
default	true	1000 ms
profiling	true	1000 ms

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

Examples 3

accumulatedCount	long	257
activeCount	long	34
daemonCount	long	33
peakCount	long	85
startTime	long: millis	23252758042

accumulatedCount	long	303
activeCount	long	66
daemonCount	long	57
peakCount	long	66
startTime	long: millis	41436649583

accumulatedCount	long	305
activeCount	long	66
daemonCount	long	57
peakCount	long	84
startTime	long: millis	39259869125

ClassLoadingStatistics

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

Category: Java Application / Statistics

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

Configuration	enabled	period
default	true	1000 ms
profiling	true	1000 ms

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

Examples 3

loadedClassCount	long	14278
startTime	long: millis	46320727625
unloadedClassCount	long	3198

loadedClassCount	long	28803
startTime	long: millis	85157198375
unloadedClassCount	long	11848

loadedClassCount	long	28715
startTime	long: millis	76319933500
unloadedClassCount	long	11846

ClassLoaderStatistics

default profiling startTime duration every chunk 11 17 21 23 24

Category: Java Application / Statistics

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

Configuration	enabled	period
default	true	everyChunk
profiling	true	everyChunk

Field	Type	Description
classLoader	ClassLoader	Class Loader Consider contributing a description to jfreventcollector.
parentClassLoader	ClassLoader	Parent Class Loader Consider contributing a description to jfreventcollector.
classLoaderData	ulong: address	ClassLoaderData Pointer Pointer to the ClassLoaderData structure in the JVM
classCount	long	Classes Number of loaded classes
chunkSize	ulong: bytes	Total Chunk Size Total size of all allocated metaspace chunks (each chunk has several blocks)
blockSize	ulong: bytes	Total Block Size Total size of all allocated metaspace blocks (each chunk has several blocks)
anonymousClassCount	long 11 until JDK 12	Unsafe Anonymous Classes Number of loaded classes to support invokedynamic
anonymousChunkSize	ulong: bytes 11 until JDK 12	Total Unsafe Anonymous Classes Chunk Size Total size of all allocated metaspace chunks for anonymous classes (each chunk has several blocks)
anonymousBlockSize	ulong: bytes 11 until JDK 12	Total Unsafe Anonymous Classes Block Size Total size of all allocated metaspace blocks for anonymous classes (each chunk has several blocks)

Examples 3

blockSize	ulong: bytes	20688
chunkSize	ulong: bytes	24576
classCount	long	5
classLoader	ClassLoader
name	string	platform
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	jdk/internal/loader/ClassLoaders$PlatformClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	jdk/internal/loader
classLoaderData	ulong: address	105553176987200
parentClassLoader	ClassLoader	null
startTime	long: millis	14905961375

blockSize	ulong: bytes	18308920
chunkSize	ulong: bytes	19177472
classCount	long	2604
classLoader	ClassLoader	null
classLoaderData	ulong: address	105553170251776
parentClassLoader	ClassLoader	null
startTime	long: millis	30586574542

blockSize	ulong: bytes	286472
chunkSize	ulong: bytes	289792
classCount	long	112
classLoader	ClassLoader
name	string	app
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	jdk/internal/loader/ClassLoaders$AppClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	jdk/internal/loader
classLoaderData	ulong: address	105553151822496
parentClassLoader	ClassLoader
name	string	platform
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	jdk/internal/loader/ClassLoaders$PlatformClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	jdk/internal/loader
startTime	long: millis	22149867292

ThreadAllocationStatistics

default profiling startTime every chunk 11 17 21 23 24

Category: Java Application / Statistics

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

Configuration	enabled	period
default	true	everyChunk
profiling	true	everyChunk

Field	Type	Description
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	463045720
startTime	long: millis	17899740292
thread	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

allocated	ulong: bytes	60660904
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-13
javaThreadId	long	102
osName	string	UCT-akka.actor.default-dispatcher-13
osThreadId	long	19723
virtual	boolean	false

allocated	ulong: bytes	1584
startTime	long: millis	12401705334
thread	Thread
group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.internal-dispatcher-3
javaThreadId	long	101
osName	string	UCT-akka.actor.internal-dispatcher-3
osThreadId	long	54275
virtual	boolean	false

ExceptionStatistics

default profiling startTime duration stackTrace 11 17 21 until JDK 23

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

Category: Java Application / Statistics

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

Configuration	enabled	period
default	true	1000 ms
profiling	true	1000 ms

Field	Type	Description
throwables	long	Exceptions Created

Examples 3

stackTrace	StackTrace	null
startTime	long: millis	50502600833
throwables	long	202129

stackTrace	StackTrace	null
startTime	long: millis	33120925875
throwables	long	4906

stackTrace	StackTrace	null
startTime	long: millis	31668346459
throwables	long	85876

Java Development Kit

X509Certificate

startTime duration stackTrace 11 17 21 until JDK 23

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

Category: Java Development Kit / Security

Details of X.509 Certificate parsed by JDK

Configuration	enabled	stackTrace
default	false	true
profiling	false	true

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

Deserialization

startTime duration stackTrace 11 17 21 until JDK 23

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

Category: Java Development Kit / Serialization

Results of deserialiation and ObjectInputFilter checks

Configuration	enabled	stackTrace
default	false	true
profiling	false	true

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

TLSHandshake

startTime duration stackTrace 11 17 21 until JDK 23

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

Category: Java Development Kit / Security

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	long: certificateId	Certificate Id Peer Certificate Id

X509Validation

startTime duration stackTrace 11 17 21 until JDK 23

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

Category: Java Development Kit / Security

Serial numbers from X.509 Certificates forming chain of trust

Configuration	enabled	stackTrace
default	false	true
profiling	false	true

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

SecurityProviderService

startTime duration stackTrace 11 17 21 until JDK 23

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

Category: Java Development Kit / Security

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	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	465302458
type	string	MessageDigest

SecurityPropertyModification

startTime duration stackTrace 11 17 21 until JDK 23

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

Category: Java Development Kit / Security

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.

Operating System

OSInformation

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

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	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	78940164583

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	50916129792

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

VirtualizationInformation

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

Category: Operating System

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

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
name	string	Name

Examples 3

name	string	No virtualization detected
startTime	long: millis	30519030417

name	string	No virtualization detected
startTime	long: millis	22148537542

name	string	No virtualization detected
startTime	long: millis	78940165208

InitialEnvironmentVariable

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

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	beginChunk
profiling	true	beginChunk

Field	Type	Description
key	string	Key
value	string	Value

Examples 3

key	string	MANPATH
startTime	long: millis	422640458
value	string	/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/share/man:/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/usr/share/man:/Applications/Xcode.app/Contents/Developer/usr/share/man:/Applications/Xcode.app/Contents/Developer/Toolchai…

key	string	HOMEBREW_PREFIX
startTime	long: millis	15755091500
value	string	/opt/homebrew

key	string	GPG_TTY
startTime	long: millis	672949625
value	string	/dev/ttys004

SystemProcess

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

Category: Operating System

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

Configuration	enabled	period
default	true	endChunk
profiling	true	endChunk

Field	Type	Description
pid	string	Process Identifier
commandLine	string	Command Line

Examples 3

commandLine	string	/usr/libexec/securityd_system
pid	string	778
startTime	long: millis	14787855958

commandLine	string	/usr/libexec/watchdogd
pid	string	558
startTime	long: millis	12397004584

commandLine	string	/usr/libexec/timed
pid	string	577
startTime	long: millis	16726490792

CPUInformation

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

Category: Operating System / Processor

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

Configuration	enabled	period
default	true	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	39218572375

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

cores	uint	8
cpu	string	AArch64
description	string	AArch64 0x61:0x0:0x1b588bb3:0, fp, asimd, aes, pmull, sha1, sha256, crc32, lse, sha3, sha512
hwThreads	uint	8
sockets	uint	8
startTime	long: millis	672965459

CPUTimeStampCounter

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

Category: Operating System / Processor

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

Configuration	enabled	period
default	true	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	27599413459

fastTimeAutoEnabled	boolean	false
fastTimeEnabled	boolean	false
fastTimeFrequency	long: hertz	1000000000
osFrequency	long: hertz	1000000000
startTime	long: millis	96710876125

fastTimeAutoEnabled	boolean	false
fastTimeEnabled	boolean	false
fastTimeFrequency	long: hertz	1000000000
osFrequency	long: hertz	1000000000
startTime	long: millis	422664667

CPULoad

default profiling startTime duration every chunk 11 17 21 23 24

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	1.7263215E-4
jvmUser	float: percentage	0.005995614
machineTotal	float: percentage	0.9427083
startTime	long: millis	61480240958

jvmSystem	float: percentage	0.0019449111
jvmUser	float: percentage	0.01000863
machineTotal	float: percentage	0.99489146
startTime	long: millis	48327320417

jvmSystem	float: percentage	0.0020106633
jvmUser	float: percentage	0.009963808
machineTotal	float: percentage	0.8297332
startTime	long: millis	33686881125

ThreadCPULoad

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

Category: Operating System / Processor

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

Configuration	enabled	period
default	true	10 s
profiling	true	10 s

Field	Type	Description
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	10760177417
system	float: percentage	0.0030146404
user	float: percentage	0.014333166

startTime	long: millis	6536881000
system	float: percentage	0.0047275126
user	float: percentage	0.007145441

startTime	long: millis	6180432500
system	float: percentage	0.0046024476
user	float: percentage	0.0072099967

ThreadContextSwitchRate

default profiling startTime duration every chunk 11 17 21 23 24

Category: Operating System / Processor

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

Configuration	enabled	period
default	true	10 s
profiling	true	10 s

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

Examples 3

startTime	long: millis	55364861917
switchRate	float: hertz	79062.3

startTime	long: millis	51975417334
switchRate	float: hertz	9814.13

startTime	long: millis	32358574500
switchRate	float: hertz	11796.922

NetworkUtilization

default profiling startTime every chunk 11 17 21 23 24

Category: Operating System / Network

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

Configuration	enabled	period
default	true	5 s
profiling	true	5 s

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

Examples 3

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

networkInterface	NetworkInterfaceName	en0
readRate	long: bits-per-second	43200
startTime	long: millis	21201632209
writeRate	long: bits-per-second	32000

networkInterface	NetworkInterfaceName	lo0
readRate	long: bits-per-second	116688
startTime	long: millis	35158814125
writeRate	long: bits-per-second	116688

PhysicalMemory

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

Category: Operating System / Memory

OS Physical Memory

Configuration	enabled	period
default	true	everyChunk
profiling	true	everyChunk

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

Examples 3

startTime	long: millis	75962671542
totalSize	ulong: bytes	17179869184
usedSize	ulong: bytes	16750444544

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

startTime	long: millis	675830167
totalSize	ulong: bytes	17179869184
usedSize	ulong: bytes	17021386752

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

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/StringBuilder;
name	string	append
type	string	java/lang/StringBuilder

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

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

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

ClassLoader

Java Class Loader

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

CodeBlobType

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

Field	Type	Description
type	string	Type

Examples 3

CodeHeap 'non-nmethods'

CodeHeap 'profiled nmethods'

CompilerPhaseType

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

Field	Type	Description
phase	string	Phase

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

FlagValueOrigin

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

Field	Type	Description
origin	string	Origin

Examples 3

Default

FrameType

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

Field	Type	Description
description	string	Description

Examples 3

Interpreted

Native

JIT compiled

G1EvacuationStatistics

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

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

Field	Type	Description
gcId	uint	GC Identifier
allocated	ulong: bytes	Allocated Total memory allocated by PLABs
wasted	ulong: bytes	Wasted Total memory wasted within PLABs due to alignment or refill
used	ulong: bytes	Used Total memory occupied by objects within PLABs
undoWaste	ulong: bytes	Undo Wasted Total memory wasted due to allocation undo within PLABs
regionEndWaste	ulong: bytes	Region End Wasted Total memory wasted at the end of regions due to refill
regionsRefilled	uint	Region Refills Number of regions refilled
directAllocated	ulong: bytes	Allocated (direct) Total memory allocated using direct allocation outside of PLABs
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	700040
directAllocated	ulong: bytes	9875184
failureUsed	ulong: bytes	0
failureWaste	ulong: bytes	0
gcId	uint	67
regionEndWaste	ulong: bytes	212552
regionsRefilled	uint	6
undoWaste	ulong: bytes	0
used	ulong: bytes	636528
wasted	ulong: bytes	15056

allocated	ulong: bytes	0
directAllocated	ulong: bytes	0
failureUsed	ulong: bytes	0
failureWaste	ulong: bytes	0
gcId	uint	75
regionEndWaste	ulong: bytes	0
regionsRefilled	uint	0
undoWaste	ulong: bytes	0
used	ulong: bytes	0
wasted	ulong: bytes	0

G1HeapRegionType

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

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

Field	Type	Description
type	string	Type

Examples 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

Normal

GCCause

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

Field	Type	Description
cause	string	Cause

Examples 3

G1 Evacuation Pause

Allocation Failure

GCName

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

Field	Type	Description
name	string	Name

Examples 3

G1New

G1Old

ParallelScavenge

GCThresholdUpdater

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

Field	Type	Description
updater	string	Updater

Examples 3

compute_new_size

GCWhen

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

Field	Type	Description
when	string	When

Examples 3

After GC

Before GC

InflateCause

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

Field	Type	Description
cause	string	Cause

MetadataType

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

Field	Type	Description
type	string	Type

Examples 3

Class

Metadata

MetaspaceObjectType

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

Field	Type	Description
type	string	Type

Examples 3

Method

ConstMethod

ConstantPool

MetaspaceSizes

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

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

Examples 3

committed	ulong: bytes	2686976
reserved	ulong: bytes	1073741824
used	ulong: bytes	2530200

committed	ulong: bytes	21168128
reserved	ulong: bytes	67108864
used	ulong: bytes	20983624

committed	ulong: bytes	23855104
reserved	ulong: bytes	1140850688
used	ulong: bytes	23513824

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

lo0

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	30244077568
size	ulong: bytes	179306496
start	ulong: address	30064771072
used	ulong: bytes	6441064

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

end	ulong: address	32995540992
size	ulong: bytes	67108864
start	ulong: address	32928432128
used	ulong: bytes	0

OldObject

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

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

Examples 3

address	ulong: address	30171738800
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/lang/invoke/BoundMethodHandle$Species_LL
package	Package
exported	boolean	true
module	Module
classLoader	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/invoke

address	ulong: address	31579891536
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/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

address	ulong: address	30252583000
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/ConcurrentHashMap$Node;
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	21.0.1
name	string	java/util/concurrent

OldObjectArray

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

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

OldObjectField

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

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

OldObjectGcRoot

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

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

Examples 3

null

OldObjectRootSystem

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

Field	Type	Description
system	string	System

OldObjectRootType

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

Field	Type	Description
type	string	Type

Package

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

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

Reference

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

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

Examples 3

null

ReferenceType

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

Field	Type	Description
type	string	Type

Examples 3

Soft reference

Final reference

Weak 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 2

ShenandoahGC
ShenandoahGC

Empty Committed

Trash

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	-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

bytecodeIndex	int	106
lineNumber	int	2839
method	Method
descriptor	string	(Ljava/lang/String;)Ljava/util/List;
hidden	boolean	false
modifiers	int	8
name	string	parse
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/util/Formatter
package	Package
exported	boolean	true
module	Module
classLoader	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

bytecodeIndex	int	198
lineNumber	int	403
method	Method
descriptor	string	(Z[Z)Ljava/lang/String;
hidden	boolean	false
modifiers	int	2
name	string	implReadLine
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/io/BufferedReader
package	Package
exported	boolean	true
module	Module
classLoader	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	JIT compiled

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

Examples 3

frames	StackFrame
bytecodeIndex	int	106
lineNumber	int	2839
method	Method
descriptor	string	(Ljava/lang/String;)Ljava/util/List;
hidden	boolean	false
modifiers	int	8
name	string	parse
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/util/Formatter
package	Package
exported	boolean	true
module	Module
classLoader	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

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

frames	StackFrame
bytecodeIndex	int	198
lineNumber	int	403
method	Method
descriptor	string	(Z[Z)Ljava/lang/String;
hidden	boolean	false
modifiers	int	2
name	string	implReadLine
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/io/BufferedReader
package	Package
exported	boolean	true
module	Module
classLoader	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	JIT compiled
		…
truncated	boolean	false

Symbol

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

Field	Type	Description
string	string	String

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

ThreadGroup

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

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

Examples 3

name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null

name	string	system
parent	ThreadGroup	null

null

ThreadState

Java Thread State

Field	Type	Description
name	string	Name

Examples 3

STATE_RUNNABLE

VMOperationType

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

Field	Type	Description
type	string	Type

Examples 3

GenCollectForAllocation

G1CollectForAllocation

ParallelGCFailedAllocation

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	30691819520
committedSize	ulong: bytes	627048448
reservedEnd	ulong: address	34359738368
reservedSize	ulong: bytes	4294967296
start	ulong: address	30064771072

committedEnd	ulong: address	30549737472
committedSize	ulong: bytes	484966400
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

ZStatisticsCounterType

Appearing in: ZGC

Missing in: G1GC, ParallelGC, SerialGC, ShenandoahGC

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

Field	Type	Description
counter	string	Counter

Examples 1

Page Cache Miss

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 Roots JavaThreads

XML Content Types

address

Annotation: jdk.jfr.MemoryAddress

Examples 3

4520263680

6707646464

bits-per-second

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

Examples 3

43200

3898664

32000

bytes

Annotation: jdk.jfr.DataAmount(BYTES)

Examples 3

17179869184

1584

17021386752

bytes-per-second

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

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

Examples 2

G1GC
G1GC

1.0198903803517283E9

8434366.22359905

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

9814.13

1000000000

millis

Annotation: jdk.jfr.Timespan(MILLISECONDS)

Examples 3

58733054167

711978167

723911959

nanos

Annotation: jdk.jfr.Timespan(NANOSECONDS)

Examples 3

-9223372036854775808

percentage

Annotation: jdk.jfr.Percentage

Examples 3

0.45

0.009963808

0.47368422

tickspan

Annotation: jdk.jfr.Timespan(TICKS)

Examples 3

151270250

7928875

1660708

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

null

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

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	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

name	string	bootstrap
type	Class	null

name	string	bootstrap
type	Class	null

Method

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


Parameter Type	const Method*
Field Type	const Method*

Examples 3

descriptor	string	(Ljava/lang/String;)Ljava/util/List;
hidden	boolean	false
modifiers	int	8
name	string	parse
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/util/Formatter
package	Package
exported	boolean	true
module	Module
classLoader	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

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

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

Module

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


Parameter Type	const ModuleEntry*
Field Type	const ModuleEntry*

Examples 3

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

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

classLoader	ClassLoader
name	string	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

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.logging
name	string	java.logging
version	string	21.0.1
name	string	java/util/logging

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

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

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-17
javaThreadId	long	139
osName	string	UCT-akka.actor.default-dispatcher-17
osThreadId	long	39175
virtual	boolean	false

group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.default-dispatcher-12
javaThreadId	long	134
osName	string	UCT-akka.actor.default-dispatcher-12
osThreadId	long	35847
virtual	boolean	false

group	ThreadGroup
name	string	main
parent	ThreadGroup
name	string	system
parent	ThreadGroup	null
javaName	string	UCT-akka.actor.internal-dispatcher-3
javaThreadId	long	101
osName	string	UCT-akka.actor.internal-dispatcher-3
osThreadId	long	54275
virtual	boolean	false

Ticks

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

38284319625

77541736750

78193205417

Tickspan

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


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

boolean


Parameter Type	bool
Field Type	bool
Java Type	boolean

Examples 3

true

false

byte


Parameter Type	s1
Field Type	s1
Java Type	byte

char


Parameter Type	char
Field Type	char
Java Type	char

double


Parameter Type	double
Field Type	double
Java Type	double

Examples 3

-1.0

0.0

20.0

float


Parameter Type	float
Field Type	float
Java Type	float

int


Parameter Type	s4
Field Type	s4
Java Type	int

Examples 3

1057

long


Parameter Type	s8
Field Type	s8
Java Type	long

Examples 3

101

54275

21922

short


Parameter Type	s2
Field Type	s2
Java Type	short

string


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

Examples 3

jdk/internal/loader

jdk/internal/loader/ClassLoaders$AppClassLoader

bootstrap

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

256

ushort

unsigned


Parameter Type	u2
Field Type	u2
Java Type	short

Examples 3