"jcmd 0 Thread.print" - Generating Thread Dump

Java Tools Tutorials - Herong's Tutorial Examples

∟"jcmd 0 Thread.print" - Generating Thread Dump

This section provides a tutorial example on how to use the 'jcmd 0 Thread.print' command to generate a thread dump of a given JVM.

Another nice diagnostic command is the "jcmd 0 Thread.print" command, which generates the thread dump of a given JVM:

herong> jcmd LongSleep Thread.print | more
7192:
Full thread dump Java HotSpot(TM) 64-Bit Server VM (10.0.1+10 mixed mode):

Threads class SMR info:
_java_thread_list=0x0000000023d4d420, length=11, elements={...}

"main" #1 prio=5 os_prio=0 tid=0x0000000000490800 nid=0x1780 waiting on
condition  [0x0000000001ebf000]
   java.lang.Thread.State: TIMED_WAITING (sleeping)
        at java.lang.Thread.sleep(java.base@10.0.1/Native Method)
        at LongSleep.main(LongSleep.java:9)

"Reference Handler" #2 daemon prio=10 os_prio=2 tid=0x0000000021de6800
nid=0x2bb8 waiting on condition  [0x00000000232ff000]
   java.lang.Thread.State: RUNNABLE
  at java.lang.ref.Reference.waitForReferencePendingList(...)
  at java.lang.ref.Reference.processPendingReferences(...)

"Finalizer" #3 daemon prio=8 os_prio=1 tid=0x0000000021dea800 nid=0xa50
in Object.wait()  [0x000000002352f000]
   java.lang.Thread.State: WAITING (on object monitor)
  at java.lang.Object.wait(java.base@10.0.1/Native Method)
  - waiting on <0x00000000c7b09410> (a java.lang.ref.ReferenceQueue$Lock)
  at java.lang.ref.ReferenceQueue.remove(java.base@10.0.1/...)
...