一，jstack查看帮助:
[lhdop@blog ~]$ jstack --help Usage: jstack [-l][-e] <pid> (to connect to running process) Options: -l long listing. Prints additional information about locks -e extended listing. Prints additional information about threads -? -h --help -help to print this help message
-l 打印锁的额外信息
-e 打印线程的附加信息
说明：刘宏缔的架构森林是一个专注架构的博客，地址：https://www.cnblogs.com/architectforest
对应的源码可以访问这里获取： https://github.com/liuhongdi/
或: https://gitee.com/liuhongdi
说明：作者:刘宏缔 邮箱: 371125307@qq.com
二，jstack使用例子:
1,得到进程id
[lhdop@blog ~]$ jps 28640 Jps 20756 storeback-0.0.1-SNAPSHOT.jar
2,查看线程信息:
[lhdop@blog ~]$ jstack 20756 2022-03-20 20:42:51 Full thread dump Java HotSpot(TM) 64-Bit Server VM (15+36-1562 mixed mode, sharing): Threads class SMR info: _java_thread_list=0x00007f458c68c550, length=30, elements={ 0x00007f45e019f010, 0x00007f45e01a0750, 0x00007f45e01a9f40, 0x00007f45e01ab650, 0x00007f45e01ad270, 0x00007f45e01aeaa0, 0x00007f45e01b01a0, 0x00007f45e0205510, 0x00007f45e0208b50, 0x00007f45e0b0e850, 0x00007f45e0506880, 0x00007f45e104cdc0, 0x00007f45500030f0, 0x00007f45e0303ad0, 0x00007f45e170d7a0, 0x00007f45e1710c60, 0x00007f45e17202c0, 0x00007f45e0028a10, 0x00007f454409a8f0, 0x00007f454c007230, 0x00007f454c004cb0, 0x00007f454c0029c0, 0x00007f454c007930, 0x00007f454c008ad0, 0x00007f454c00db20, 0x00007f454c005ca0, 0x00007f454c006550, 0x00007f454c00ed80, 0x00007f454c00ff30, 0x00007f4594000ce0 } "Reference Handler" #2 daemon prio=10 os_prio=0 cpu=5.07ms elapsed=187206.42s tid=0x00007f45e019f010 nid=0x511c waiting on condition [0x00007f45e42d4000] java.lang.Thread.State: RUNNABLE at java.lang.ref.Reference.waitForReferencePendingList(java.base@15/Native Method) at java.lang.ref.Reference.processPendingReferences(java.base@15/Reference.java:241) at java.lang.ref.Reference$ReferenceHandler.run(java.base@15/Reference.java:213) "Finalizer" #3 daemon prio=8 os_prio=0 cpu=0.20ms elapsed=187206.42s tid=0x00007f45e01a0750 nid=0x511d in Object.wait() [0x00007f45e41d3000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(java.base@15/Native Method) - waiting on <0x0000000710800c68> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(java.base@15/ReferenceQueue.java:155) - locked <0x0000000710800c68> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(java.base@15/ReferenceQueue.java:176) at java.lang.ref.Finalizer$FinalizerThread.run(java.base@15/Finalizer.java:170) "Signal Dispatcher" #4 daemon prio=9 os_prio=0 cpu=0.24ms elapsed=187206.41s tid=0x00007f45e01a9f40 nid=0x511e runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE "Service Thread" #5 daemon prio=9 os_prio=0 cpu=2151.91ms elapsed=187206.41s tid=0x00007f45e01ab650 nid=0x511f runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE "C2 CompilerThread0" #6 daemon prio=9 os_prio=0 cpu=12427.80ms elapsed=187206.41s tid=0x00007f45e01ad270 nid=0x5120 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE No compile task "C1 CompilerThread0" #8 daemon prio=9 os_prio=0 cpu=4189.22ms elapsed=187206.41s tid=0x00007f45e01aeaa0 nid=0x5121 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE No compile task "Sweeper thread" #9 daemon prio=9 os_prio=0 cpu=97.32ms elapsed=187206.41s tid=0x00007f45e01b01a0 nid=0x5122 runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE "Notification Thread" #10 daemon prio=9 os_prio=0 cpu=0.05ms elapsed=187206.40s tid=0x00007f45e0205510 nid=0x5123 runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE "Common-Cleaner" #11 daemon prio=8 os_prio=0 cpu=86.83ms elapsed=187206.40s tid=0x00007f45e0208b50 nid=0x5125 in Object.wait() [0x00007f45c0b92000] java.lang.Thread.State: TIMED_WAITING (on object monitor) at java.lang.Object.wait(java.base@15/Native Method) - waiting on <no object reference available> at java.lang.ref.ReferenceQueue.remove(java.base@15/ReferenceQueue.java:155) - locked <0x0000000710800f90> (a java.lang.ref.ReferenceQueue$Lock) at jdk.internal.ref.CleanerImpl.run(java.base@15/CleanerImpl.java:148) at java.lang.Thread.run(java.base@15/Thread.java:832) at jdk.internal.misc.InnocuousThread.run(java.base@15/InnocuousThread.java:134) "Log4j2-TF-10-AsyncLoggerConfig-2" #16 daemon prio=5 os_prio=0 cpu=161145.55ms elapsed=187204.61s tid=0x00007f45e0b0e850 nid=0x512e waiting on condition [0x00007f45c057f000] java.lang.Thread.State: TIMED_WAITING (parking) at jdk.internal.misc.Unsafe.park(java.base@15/Native Method) - parking to wait for <0x0000000710801858> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.parkNanos(java.base@15/LockSupport.java:252) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(java.base@15/AbstractQueuedSynchronizer.java:1661) at com.lmax.disruptor.TimeoutBlockingWaitStrategy.waitFor(TimeoutBlockingWaitStrategy.java:38) at com.lmax.disruptor.ProcessingSequenceBarrier.waitFor(ProcessingSequenceBarrier.java:56) at com.lmax.disruptor.BatchEventProcessor.processEvents(BatchEventProcessor.java:159) at com.lmax.disruptor.BatchEventProcessor.run(BatchEventProcessor.java:125) at java.lang.Thread.run(java.base@15/Thread.java:832) "mysql-cj-abandoned-connection-cleanup" #19 daemon prio=5 os_prio=0 cpu=2381.28ms elapsed=187202.91s tid=0x00007f45e0506880 nid=0x5132 in Object.wait() [0x00007f45c0a91000] java.lang.Thread.State: TIMED_WAITING (on object monitor) at java.lang.Object.wait(java.base@15/Native Method) - waiting on <no object reference available> at java.lang.ref.ReferenceQueue.remove(java.base@15/ReferenceQueue.java:155) - locked <0x0000000711b2a710> (a java.lang.ref.ReferenceQueue$Lock) at com.mysql.cj.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:91) at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@15/ThreadPoolExecutor.java:1130) at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@15/ThreadPoolExecutor.java:630) at java.lang.Thread.run(java.base@15/Thread.java:832) "Catalina-utility-1" #20 prio=1 os_prio=0 cpu=5639.35ms elapsed=187202.42s tid=0x00007f45e104cdc0 nid=0x5135 waiting on condition [0x00007f45b0150000] java.lang.Thread.State: WAITING (parking) at jdk.internal.misc.Unsafe.park(java.base@15/Native Method) - parking to wait for <0x0000000711b2ed88> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.park(java.base@15/LockSupport.java:341) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(java.base@15/AbstractQueuedSynchronizer.java:505) at java.util.concurrent.ForkJoinPool.managedBlock(java.base@15/ForkJoinPool.java:3137) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@15/AbstractQueuedSynchronizer.java:1614) at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(java.base@15/ScheduledThreadPoolExecutor.java:1177) at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(java.base@15/ScheduledThreadPoolExecutor.java:899) at java.util.concurrent.ThreadPoolExecutor.getTask(java.base@15/ThreadPoolExecutor.java:1056) at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@15/ThreadPoolExecutor.java:1116) at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@15/ThreadPoolExecutor.java:630) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(java.base@15/Thread.java:832) "Catalina-utility-2" #21 prio=1 os_prio=0 cpu=5816.00ms elapsed=187202.42s tid=0x00007f45500030f0 nid=0x5136 waiting on condition [0x00007f4562efa000] java.lang.Thread.State: TIMED_WAITING (parking) at jdk.internal.misc.Unsafe.park(java.base@15/Native Method) - parking to wait for <0x0000000711b2ed88> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.parkNanos(java.base@15/LockSupport.java:252) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(java.base@15/AbstractQueuedSynchronizer.java:1661) at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(java.base@15/ScheduledThreadPoolExecutor.java:1182) at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(java.base@15/ScheduledThreadPoolExecutor.java:899) at java.util.concurrent.ThreadPoolExecutor.getTask(java.base@15/ThreadPoolExecutor.java:1056) at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@15/ThreadPoolExecutor.java:1116) at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@15/ThreadPoolExecutor.java:630) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(java.base@15/Thread.java:832) "container-0" #22 prio=5 os_prio=0 cpu=356.38ms elapsed=187202.42s tid=0x00007f45e0303ad0 nid=0x5137 waiting on condition [0x00007f4562df9000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(java.base@15/Native Method) at org.apache.catalina.core.StandardServer.await(StandardServer.java:563) at org.springframework.boot.web.embedded.tomcat.TomcatWebServer$1.run(TomcatWebServer.java:197) "http-nio-10800-Poller" #23 daemon prio=5 os_prio=0 cpu=4016.53ms elapsed=187201.75s tid=0x00007f45e170d7a0 nid=0x5138 runnable [0x00007f45626f6000] java.lang.Thread.State: RUNNABLE at sun.nio.ch.EPoll.wait(java.base@15/Native Method) at sun.nio.ch.EPollSelectorImpl.doSelect(java.base@15/EPollSelectorImpl.java:120) at sun.nio.ch.SelectorImpl.lockAndDoSelect(java.base@15/SelectorImpl.java:129) - locked <0x0000000710c07008> (a sun.nio.ch.Util$2) - locked <0x0000000710c07018> (a sun.nio.ch.EPollSelectorImpl) at sun.nio.ch.SelectorImpl.select(java.base@15/SelectorImpl.java:141) at org.apache.tomcat.util.net.NioEndpoint$Poller.run(NioEndpoint.java:787) at java.lang.Thread.run(java.base@15/Thread.java:832) "http-nio-10800-Acceptor" #24 daemon prio=5 os_prio=0 cpu=20.01ms elapsed=187201.75s tid=0x00007f45e1710c60 nid=0x5139 runnable [0x00007f45625f5000] java.lang.Thread.State: RUNNABLE at sun.nio.ch.Net.accept(java.base@15/Native Method) at sun.nio.ch.ServerSocketChannelImpl.accept(java.base@15/ServerSocketChannelImpl.java:305) at org.apache.tomcat.util.net.NioEndpoint.serverSocketAccept(NioEndpoint.java:540) at org.apache.tomcat.util.net.NioEndpoint.serverSocketAccept(NioEndpoint.java:78) at org.apache.tomcat.util.net.Acceptor.run(Acceptor.java:106) at java.lang.Thread.run(java.base@15/Thread.java:832) "scheduling-1" #25 prio=5 os_prio=0 cpu=1282.91ms elapsed=187201.74s tid=0x00007f45e17202c0 nid=0x513a waiting on condition [0x00007f45624f4000] java.lang.Thread.State: TIMED_WAITING (parking) at jdk.internal.misc.Unsafe.park(java.base@15/Native Method) - parking to wait for <0x0000000710c07280> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.parkNanos(java.base@15/LockSupport.java:252) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(java.base@15/AbstractQueuedSynchronizer.java:1661) at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(java.base@15/ScheduledThreadPoolExecutor.java:1182) at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(java.base@15/ScheduledThreadPoolExecutor.java:899) at java.util.concurrent.ThreadPoolExecutor.getTask(java.base@15/ThreadPoolExecutor.java:1056) at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@15/ThreadPoolExecutor.java:1116) at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@15/ThreadPoolExecutor.java:630) at java.lang.Thread.run(java.base@15/Thread.java:832) "DestroyJavaVM" #26 prio=5 os_prio=0 cpu=4304.97ms elapsed=187201.74s tid=0x00007f45e0028a10 nid=0x5115 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "HikariPool-1 housekeeper" #27 daemon prio=5 os_prio=0 cpu=499.97ms elapsed=186771.10s tid=0x00007f454409a8f0 nid=0x5164 waiting on condition [0x00007f45621f2000] java.lang.Thread.State: TIMED_WAITING (parking) at jdk.internal.misc.Unsafe.park(java.base@15/Native Method) - parking to wait for <0x0000000710f74570> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.parkNanos(java.base@15/LockSupport.java:252) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(java.base@15/AbstractQueuedSynchronizer.java:1661) at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(java.base@15/ScheduledThreadPoolExecutor.java:1182) at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(java.base@15/ScheduledThreadPoolExecutor.java:899) at java.util.concurrent.ThreadPoolExecutor.getTask(java.base@15/ThreadPoolExecutor.java:1056) at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@15/ThreadPoolExecutor.java:1116) at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@15/ThreadPoolExecutor.java:630) at java.lang.Thread.run(java.base@15/Thread.java:832) "http-nio-10800-exec-1" #197 daemon prio=5 os_prio=0 cpu=215.99ms elapsed=162530.12s tid=0x00007f454c007230 nid=0x5519 waiting on condition [0x00007f45620f1000] java.lang.Thread.State: WAITING (parking) at jdk.internal.misc.Unsafe.park(java.base@15/Native Method) - parking to wait for <0x0000000710dd9760> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.park(java.base@15/LockSupport.java:341) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(java.base@15/AbstractQueuedSynchronizer.java:505) at java.util.concurrent.ForkJoinPool.managedBlock(java.base@15/ForkJoinPool.java:3137) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@15/AbstractQueuedSynchronizer.java:1614) at java.util.concurrent.LinkedBlockingQueue.take(java.base@15/LinkedBlockingQueue.java:435) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:146) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:33) at org.apache.tomcat.util.threads.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1114) at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1176) at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(java.base@15/Thread.java:832) "http-nio-10800-exec-2" #198 daemon prio=5 os_prio=0 cpu=244.82ms elapsed=162530.12s tid=0x00007f454c004cb0 nid=0x551a waiting on condition [0x00007f4561dee000] java.lang.Thread.State: WAITING (parking) at jdk.internal.misc.Unsafe.park(java.base@15/Native Method) - parking to wait for <0x0000000710dd9760> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.park(java.base@15/LockSupport.java:341) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(java.base@15/AbstractQueuedSynchronizer.java:505) at java.util.concurrent.ForkJoinPool.managedBlock(java.base@15/ForkJoinPool.java:3137) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@15/AbstractQueuedSynchronizer.java:1614) at java.util.concurrent.LinkedBlockingQueue.take(java.base@15/LinkedBlockingQueue.java:435) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:146) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:33) at org.apache.tomcat.util.threads.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1114) at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1176) at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(java.base@15/Thread.java:832) "http-nio-10800-exec-3" #199 daemon prio=5 os_prio=0 cpu=322.76ms elapsed=162526.77s tid=0x00007f454c0029c0 nid=0x551b waiting on condition [0x00007f4561aea000] java.lang.Thread.State: WAITING (parking) at jdk.internal.misc.Unsafe.park(java.base@15/Native Method) - parking to wait for <0x0000000710dd9760> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.park(java.base@15/LockSupport.java:341) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(java.base@15/AbstractQueuedSynchronizer.java:505) at java.util.concurrent.ForkJoinPool.managedBlock(java.base@15/ForkJoinPool.java:3137) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@15/AbstractQueuedSynchronizer.java:1614) at java.util.concurrent.LinkedBlockingQueue.take(java.base@15/LinkedBlockingQueue.java:435) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:146) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:33) at org.apache.tomcat.util.threads.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1114) at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1176) at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(java.base@15/Thread.java:832) "http-nio-10800-exec-4" #200 daemon prio=5 os_prio=0 cpu=219.90ms elapsed=162525.74s tid=0x00007f454c007930 nid=0x551c waiting on condition [0x00007f45617e6000] java.lang.Thread.State: WAITING (parking) at jdk.internal.misc.Unsafe.park(java.base@15/Native Method) - parking to wait for <0x0000000710dd9760> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.park(java.base@15/LockSupport.java:341) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(java.base@15/AbstractQueuedSynchronizer.java:505) at java.util.concurrent.ForkJoinPool.managedBlock(java.base@15/ForkJoinPool.java:3137) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@15/AbstractQueuedSynchronizer.java:1614) at java.util.concurrent.LinkedBlockingQueue.take(java.base@15/LinkedBlockingQueue.java:435) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:146) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:33) at org.apache.tomcat.util.threads.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1114) at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1176) at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(java.base@15/Thread.java:832) "http-nio-10800-exec-5" #201 daemon prio=5 os_prio=0 cpu=48.59ms elapsed=162523.50s tid=0x00007f454c008ad0 nid=0x551d waiting on condition [0x00007f45616e5000] java.lang.Thread.State: WAITING (parking) at jdk.internal.misc.Unsafe.park(java.base@15/Native Method) - parking to wait for <0x0000000710dd9760> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.park(java.base@15/LockSupport.java:341) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(java.base@15/AbstractQueuedSynchronizer.java:505) at java.util.concurrent.ForkJoinPool.managedBlock(java.base@15/ForkJoinPool.java:3137) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@15/AbstractQueuedSynchronizer.java:1614) at java.util.concurrent.LinkedBlockingQueue.take(java.base@15/LinkedBlockingQueue.java:435) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:146) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:33) at org.apache.tomcat.util.threads.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1114) at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1176) at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(java.base@15/Thread.java:832) "http-nio-10800-exec-6" #202 daemon prio=5 os_prio=0 cpu=68.88ms elapsed=162521.76s tid=0x00007f454c00db20 nid=0x551e waiting on condition [0x00007f45613e2000] java.lang.Thread.State: WAITING (parking) at jdk.internal.misc.Unsafe.park(java.base@15/Native Method) - parking to wait for <0x0000000710dd9760> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.park(java.base@15/LockSupport.java:341) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(java.base@15/AbstractQueuedSynchronizer.java:505) at java.util.concurrent.ForkJoinPool.managedBlock(java.base@15/ForkJoinPool.java:3137) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@15/AbstractQueuedSynchronizer.java:1614) at java.util.concurrent.LinkedBlockingQueue.take(java.base@15/LinkedBlockingQueue.java:435) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:146) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:33) at org.apache.tomcat.util.threads.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1114) at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1176) at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(java.base@15/Thread.java:832) "http-nio-10800-exec-7" #741 daemon prio=5 os_prio=0 cpu=39.10ms elapsed=104690.97s tid=0x00007f454c005ca0 nid=0x5d93 waiting on condition [0x00007f45612e1000] java.lang.Thread.State: WAITING (parking) at jdk.internal.misc.Unsafe.park(java.base@15/Native Method) - parking to wait for <0x0000000710dd9760> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.park(java.base@15/LockSupport.java:341) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(java.base@15/AbstractQueuedSynchronizer.java:505) at java.util.concurrent.ForkJoinPool.managedBlock(java.base@15/ForkJoinPool.java:3137) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@15/AbstractQueuedSynchronizer.java:1614) at java.util.concurrent.LinkedBlockingQueue.take(java.base@15/LinkedBlockingQueue.java:435) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:146) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:33) at org.apache.tomcat.util.threads.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1114) at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1176) at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(java.base@15/Thread.java:832) "http-nio-10800-exec-8" #742 daemon prio=5 os_prio=0 cpu=46.43ms elapsed=104690.97s tid=0x00007f454c006550 nid=0x5d94 waiting on condition [0x00007f45611e0000] java.lang.Thread.State: WAITING (parking) at jdk.internal.misc.Unsafe.park(java.base@15/Native Method) - parking to wait for <0x0000000710dd9760> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.park(java.base@15/LockSupport.java:341) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(java.base@15/AbstractQueuedSynchronizer.java:505) at java.util.concurrent.ForkJoinPool.managedBlock(java.base@15/ForkJoinPool.java:3137) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@15/AbstractQueuedSynchronizer.java:1614) at java.util.concurrent.LinkedBlockingQueue.take(java.base@15/LinkedBlockingQueue.java:435) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:146) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:33) at org.apache.tomcat.util.threads.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1114) at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1176) at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(java.base@15/Thread.java:832) "http-nio-10800-exec-9" #743 daemon prio=5 os_prio=0 cpu=52.64ms elapsed=104678.06s tid=0x00007f454c00ed80 nid=0x5d96 waiting on condition [0x00007f45610df000] java.lang.Thread.State: WAITING (parking) at jdk.internal.misc.Unsafe.park(java.base@15/Native Method) - parking to wait for <0x0000000710dd9760> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.park(java.base@15/LockSupport.java:341) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(java.base@15/AbstractQueuedSynchronizer.java:505) at java.util.concurrent.ForkJoinPool.managedBlock(java.base@15/ForkJoinPool.java:3137) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@15/AbstractQueuedSynchronizer.java:1614) at java.util.concurrent.LinkedBlockingQueue.take(java.base@15/LinkedBlockingQueue.java:435) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:146) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:33) at org.apache.tomcat.util.threads.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1114) at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1176) at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(java.base@15/Thread.java:832) "http-nio-10800-exec-10" #744 daemon prio=5 os_prio=0 cpu=71.55ms elapsed=104640.96s tid=0x00007f454c00ff30 nid=0x5d9b waiting on condition [0x00007f4560fde000] java.lang.Thread.State: WAITING (parking) at jdk.internal.misc.Unsafe.park(java.base@15/Native Method) - parking to wait for <0x0000000710dd9760> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.park(java.base@15/LockSupport.java:341) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(java.base@15/AbstractQueuedSynchronizer.java:505) at java.util.concurrent.ForkJoinPool.managedBlock(java.base@15/ForkJoinPool.java:3137) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@15/AbstractQueuedSynchronizer.java:1614) at java.util.concurrent.LinkedBlockingQueue.take(java.base@15/LinkedBlockingQueue.java:435) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:146) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:33) at org.apache.tomcat.util.threads.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1114) at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1176) at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(java.base@15/Thread.java:832) "Attach Listener" #965 daemon prio=9 os_prio=0 cpu=0.67ms elapsed=80179.40s tid=0x00007f4594000ce0 nid=0x6401 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "VM Thread" os_prio=0 cpu=2218.16ms elapsed=187206.42s tid=0x00007f45e019c300 nid=0x511b runnable "GC Thread#0" os_prio=0 cpu=177.34ms elapsed=187206.43s tid=0x00007f45e0076580 nid=0x5116 runnable "GC Thread#1" os_prio=0 cpu=166.08ms elapsed=187206.20s tid=0x00007f45a8000f30 nid=0x5127 runnable "GC Thread#2" os_prio=0 cpu=178.28ms elapsed=187206.19s tid=0x00007f45a8001c90 nid=0x5128 runnable "GC Thread#3" os_prio=0 cpu=174.83ms elapsed=187206.19s tid=0x00007f45a8002a20 nid=0x512a runnable "G1 Main Marker" os_prio=0 cpu=1.46ms elapsed=187206.43s tid=0x00007f45e0086ee0 nid=0x5117 runnable "G1 Conc#0" os_prio=0 cpu=186.57ms elapsed=187206.43s tid=0x00007f45e0088170 nid=0x5118 runnable "G1 Refine#0" os_prio=0 cpu=40.57ms elapsed=187206.43s tid=0x00007f45e0127000 nid=0x5119 runnable "G1 Refine#1" os_prio=0 cpu=10.51ms elapsed=187204.62s tid=0x00007f45ac002e40 nid=0x512d runnable "G1 Refine#2" os_prio=0 cpu=0.16ms elapsed=187204.34s tid=0x00007f4564001420 nid=0x5130 runnable "G1 Refine#3" os_prio=0 cpu=0.05ms elapsed=187202.68s tid=0x00007f455c000ce0 nid=0x5133 runnable "G1 Young RemSet Sampling" os_prio=0 cpu=13952.14ms elapsed=187206.43s tid=0x00007f45e0128210 nid=0x511a runnable "VM Periodic Task Thread" os_prio=0 cpu=33512.67ms elapsed=187206.40s tid=0x00007f45e02073f0 nid=0x5124 waiting on condition JNI global refs: 15, weak refs: 0
三，jstack中的nid是什么？
nid 是这个线程对应的操作系统本地线程id，
每一个java线程都对应一个操作系统线程
我们来验证一下:
[lhdop@blog ~]$ pidstat -t -p 20756 Linux 4.18.0-80.11.2.el8_0.x86_64 (blog) 03/20/2022 _x86_64_ (4 CPU) 08:44:52 PM UID TGID TID %usr %system %guest %wait %CPU CPU Command 08:44:52 PM 1000 20756 - 0.00 0.00 0.00 0.00 0.00 1 java 08:44:52 PM 1000 - 20756 0.00 0.00 0.00 0.00 0.00 1 |__java 08:44:52 PM 1000 - 20757 0.00 0.00 0.00 0.00 0.00 0 |__java 08:44:52 PM 1000 - 20758 0.00 0.00 0.00 0.00 0.00 3 |__GC Thread#0 08:44:52 PM 1000 - 20759 0.00 0.00 0.00 0.00 0.00 2 |__G1 Main Marker 08:44:52 PM 1000 - 20760 0.00 0.00 0.00 0.00 0.00 0 |__G1 Conc#0 08:44:52 PM 1000 - 20761 0.00 0.00 0.00 0.00 0.00 1 |__G1 Refine#0 08:44:52 PM 1000 - 20762 0.00 0.00 0.00 0.00 0.00 1 |__G1 Young RemSet 08:44:52 PM 1000 - 20763 0.00 0.00 0.00 0.00 0.00 1 |__VM Thread 08:44:52 PM 1000 - 20764 0.00 0.00 0.00 0.00 0.00 0 |__Reference Handl 08:44:52 PM 1000 - 20765 0.00 0.00 0.00 0.00 0.00 1 |__Finalizer 08:44:52 PM 1000 - 20766 0.00 0.00 0.00 0.00 0.00 1 |__Signal Dispatch 08:44:52 PM 1000 - 20767 0.00 0.00 0.00 0.00 0.00 3 |__Service Thread 08:44:52 PM 1000 - 20768 0.00 0.00 0.00 0.00 0.00 1 |__C2 CompilerThre 08:44:52 PM 1000 - 20769 0.00 0.00 0.00 0.00 0.00 0 |__C1 CompilerThre 08:44:52 PM 1000 - 20770 0.00 0.00 0.00 0.00 0.00 0 |__Sweeper thread 08:44:52 PM 1000 - 20771 0.00 0.00 0.00 0.00 0.00 1 |__Notification Th 08:44:52 PM 1000 - 20772 0.00 0.00 0.00 0.00 0.00 2 |__VM Periodic Tas 08:44:52 PM 1000 - 20773 0.00 0.00 0.00 0.00 0.00 0 |__Common-Cleaner 08:44:52 PM 1000 - 20775 0.00 0.00 0.00 0.00 0.00 0 |__GC Thread#1 08:44:52 PM 1000 - 20776 0.00 0.00 0.00 0.00 0.00 3 |__GC Thread#2 08:44:52 PM 1000 - 20778 0.00 0.00 0.00 0.00 0.00 3 |__GC Thread#3 08:44:52 PM 1000 - 20781 0.00 0.00 0.00 0.00 0.00 0 |__G1 Refine#1 08:44:52 PM 1000 - 20782 0.00 0.00 0.00 0.00 0.00 1 |__Log4j2-TF-10-As 08:44:52 PM 1000 - 20784 0.00 0.00 0.00 0.00 0.00 0 |__G1 Refine#2 08:44:52 PM 1000 - 20786 0.00 0.00 0.00 0.00 0.00 3 |__mysql-cj-abando 08:44:52 PM 1000 - 20787 0.00 0.00 0.00 0.00 0.00 2 |__G1 Refine#3 08:44:52 PM 1000 - 20789 0.00 0.00 0.00 0.00 0.00 2 |__Catalina-utilit 08:44:52 PM 1000 - 20790 0.00 0.00 0.00 0.00 0.00 0 |__Catalina-utilit 08:44:52 PM 1000 - 20791 0.00 0.00 0.00 0.00 0.00 0 |__container-0 08:44:52 PM 1000 - 20792 0.00 0.00 0.00 0.00 0.00 3 |__http-nio-10800- 08:44:52 PM 1000 - 20793 0.00 0.00 0.00 0.00 0.00 0 |__http-nio-10800- 08:44:52 PM 1000 - 20794 0.00 0.00 0.00 0.00 0.00 0 |__scheduling-1 08:44:52 PM 1000 - 20836 0.00 0.00 0.00 0.00 0.00 0 |__HikariPool-1 ho 08:44:52 PM 1000 - 21785 0.00 0.00 0.00 0.00 0.00 0 |__http-nio-10800- 08:44:52 PM 1000 - 21786 0.00 0.00 0.00 0.00 0.00 0 |__http-nio-10800- 08:44:52 PM 1000 - 21787 0.00 0.00 0.00 0.00 0.00 0 |__http-nio-10800- 08:44:52 PM 1000 - 21788 0.00 0.00 0.00 0.00 0.00 3 |__http-nio-10800- 08:44:52 PM 1000 - 21789 0.00 0.00 0.00 0.00 0.00 1 |__http-nio-10800- 08:44:52 PM 1000 - 21790 0.00 0.00 0.00 0.00 0.00 0 |__http-nio-10800- 08:44:52 PM 1000 - 23955 0.00 0.00 0.00 0.00 0.00 2 |__http-nio-10800- 08:44:52 PM 1000 - 23956 0.00 0.00 0.00 0.00 0.00 1 |__http-nio-10800- 08:44:52 PM 1000 - 23958 0.00 0.00 0.00 0.00 0.00 2 |__http-nio-10800- 08:44:52 PM 1000 - 23963 0.00 0.00 0.00 0.00 0.00 0 |__http-nio-10800- 08:44:52 PM 1000 - 25601 0.00 0.00 0.00 0.00 0.00 3 |__Attach Listener
我们从其中选定scheduling-1这个线程，它的线程id是:20794
把它转为16进制:
[lhdop@blog ~]$ printf "%x\n" 20794 513a
然后查看jstack中输出的线程信息:
"scheduling-1" #25 prio=5 os_prio=0 cpu=1282.91ms elapsed=187201.74s tid=0x00007f45e17202c0 nid=0x513a waiting on condition [0x00007f45624f4000]
可以看到nid就是操作系统给线程分配的id
四，jstack中的其他项的含义
以http-nio-10800-exec-1线程为例子：
"http-nio-10800-exec-1" #197 daemon prio=5 os_prio=0 cpu=215.99ms elapsed=162530.12s tid=0x00007f454c007230 nid=0x5519 waiting on condition [0x00007f45620f1000]
1，"http-nio-10800-exec-1"： 线程名字
2， #197 ： 线程id
3, daemon : 是否守护线程，daemon表示是守护线程，daemon threads是低优先级的thread
4，prio=5： prio:java中的线程优先级，就是Thread中定义的值，取值范围: 1-10，默认值是5
5，os_prio: 对应的操作系统线程的优先级
6，cpu=215.99ms： 线程获得CPU的时间
7, elapsed=162530.12s :线程启动后经过的wall clock time
8,tid=0x00007f45e17202c0: 线程的内存地址
Java memory address of its internal Thread control structure
五，查看java的版本:
[lhdop@blog tools]$ java --version java 15 2020-09-15 Java(TM) SE Runtime Environment (build 15+36-1562) Java HotSpot(TM) 64-Bit Server VM (build 15+36-1562, mixed mode, sharing)