jvm-command-jstack

JVM
JAVA
发布日期:   2022-04-05

jstack是JDK自带的线程堆栈分析工具，使用该命令可以查看或导出 java 应用程序中线程堆栈信息。

jstack用于生成java虚拟机当前时刻的线程快照。线程快照是当前java虚拟机内每一条线程正在执行的方法堆栈的集合，生成线程快照的主要目的是定位线程出现长时间停顿的原因，如线程间死锁、死循环、请求外部资源导致的长时间等待等。 线程出现停顿的时候通过jstack来查看各个线程的调用堆栈，就可以知道没有响应的线程到底在后台做什么事情，或者等待什么资源。 如果java程序崩溃生成core文件，jstack工具可以用来获得core文件的java stack和native stack的信息，从而可以轻松地知道java程序是如何崩溃和在程序何处发生问题。

Java堆栈跟踪工具jstack

语法

jstack [ option ] [ vmid ]

使用方式 说明
jstack [ option ] pid 查看当前时间点，指定进程的dump堆栈信息
jstack [ option ] pid > 文件 将当前时间点的指定进程的dump堆栈信息，写入到指定文件中
jstack [ option ] executable core 查看当前时间点，core文件的dump堆栈信息
jstack [ option ] [server_id@] 查看当前时间点，远程机器的dump堆栈信息

option选项

选项 作用
-F 当进程挂起了，此时’jstack [-l] pid’是没有相应的，可使用此参数来强制打印堆栈信息
-m 打印java和native c/c++框架的所有栈信息。一般排查不需要
-l 除堆栈外，打印关于锁的附加信息。会使得JVM停顿得长久得多-l 建议不要用。一般情况不需要使用。

使用

jps查看java进程

work@authority-api-v1-66c44d77d6-8hhkv:~$ jps
132 Jps
47 authority-api.jar

jstack查看指定进程的当前堆栈情况

work@authority-api-v1-66c44d77d6-8hhkv:~$ jstack 47
2022-04-05 23:12:22
Full thread dump OpenJDK 64-Bit Server VM (25.222-b10 mixed mode):

"Attach Listener" #53 daemon prio=9 os_prio=0 tid=0x00007f3668001000 nid=0x98 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"http-nio-0.0.0.0-8081-exec-10" #52 daemon prio=5 os_prio=0 tid=0x00007f3608011800 nid=0x67 waiting on condition [0x00007f3630f86000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000e73b9c28> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
	at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
	at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:103)
	at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:31)
	at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)

"http-nio-0.0.0.0-8081-exec-9" #51 daemon prio=5 os_prio=0 tid=0x00007f3608010000 nid=0x66 waiting on condition [0x00007f3631087000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000e73b9c28> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
	at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
	at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:103)
	at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:31)
	at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)

将指定进程的当前堆栈情况记录到某个文件中：

work@authority-api-v1-66c44d77d6-8hhkv:~$ jstack 47 > /home/work/wangql.txt
work@authority-api-v1-66c44d77d6-8hhkv:~$

jstack实战之高cpu占用率排查

测试代码：

package com.tudou.util;

import lombok.Synchronized;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;

public class JstackTest {

    public static Executor executor = Executors.newFixedThreadPool(5);
    public static Object lock = new Object();
    public static void main(String[] args) {
        Task task1 = new Task();
        Task task2 = new Task();

        executor.execute(task1);
        executor.execute(task2);
    }
    static class Task implements Runnable {
        @Override
        public void run() {
            synchronized(lock) {
                Calculate();
            }
        }

        public void Calculate() {
            int i = 0;
            while(true) {
                i++;
            }
        }
    }
}

top命令查看各个进程的cpu使用情况，默认按cpu使用率排序

work@authority-web-v1-7688dc9bf7-kr48z:~$ top
top - 23:06:56 up 302 days,  7:36,  0 users,  load average: 8.21, 8.46, 7.72
Tasks:   7 total,   1 running,   6 sleeping,   0 stopped,   0 zombie
%Cpu(s):  6.5 us,  1.8 sy,  0.0 ni, 90.9 id,  0.7 wa,  0.0 hi,  0.2 si,  0.0 st
KiB Mem : 19706059+total,  5289860 free, 71409256 used, 12036147+buff/cache
KiB Swap:        0 total,        0 free,        0 used. 12377960+avail Mem

    PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
     47 work      20   0 5003608 332432  16292 S  47.3  0.2   1:24.66 java
      1 work      20   0    4280    692    628 S   0.0  0.0   0:01.44 sh
      6 work      20   0   19728   3112   2804 S   0.0  0.0   0:00.00 bootstrap
     16 work      20   0   19880   3204   2756 S   0.0  0.0   0:00.00 authority-web.j
   1552 work      20   0   21116   4484   2984 S   0.0  0.0   0:00.02 bash
   5218 work      20   0   21028   4676   3048 S   0.0  0.0   0:00.01 bash
   5537 work      20   0   42812   3408   2908 R   0.0  0.0   0:00.01 top

从上图中可以看出pid为47的java进程占用了较多的cpu资源；

通过top -Hp 47可以查看该进程下各个线程的cpu使用情况

work@authority-web-v1-7688dc9bf7-kr48z:~$ top -Hp 47
top - 23:07:51 up 302 days,  7:37,  0 users,  load average: 6.47, 7.91, 7.58
Threads:  48 total,   1 running,  47 sleeping,   0 stopped,   0 zombie
%Cpu(s):  5.7 us,  1.3 sy,  0.0 ni, 91.7 id,  1.1 wa,  0.0 hi,  0.2 si,  0.0 st
KiB Mem : 19706059+total,  4971968 free, 71714896 used, 12037372+buff/cache
KiB Swap:        0 total,        0 free,        0 used. 12350040+avail Mem

    PID USER      PR  NI    VIRT    RES    SHR S %CPU %MEM     TIME+ COMMAND
   5433 work      20   0 5070172 332464  16292 R 46.8  0.2   0:53.10 pool-4-thread-1
   1266 work      20   0 5070172 332464  16292 S  0.3  0.2   0:00.17 Abandoned conne
     47 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.00 java
     48 work      20   0 5070172 332464  16292 S  0.0  0.2   0:13.52 java
     49 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.88 java
     50 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.92 java
     51 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.08 java
     52 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.09 java
     53 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.52 java
     54 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.37 VM Thread
     55 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.01 Reference Handl
     56 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.03 Finalizer
     57 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.00 Surrogate Locke
     58 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.00 Signal Dispatch
     59 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.00 server-timer
     61 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.03 Thread-2
     62 work      20   0 5070172 332464  16292 S  0.0  0.2   0:23.11 C2 CompilerThre
     63 work      20   0 5070172 332464  16292 S  0.0  0.2   0:06.03 C1 CompilerThre
     64 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.13 Service Thread
     65 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.41 VM Periodic Tas
     69 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.00 Log4j2-Log4j2Sc
     74 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.00 commons-pool-Ev
     75 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.00 Timer-0
     76 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.00 ContainerBackgr
     77 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.00 container-0
     78 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.00 Thread-6
     79 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.00 pool-9-thread-1
     80 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.06 pool-10-thread-
     81 work      20   0 5070172 332464  16292 S  0.0  0.2   0:03.46 redisMessageLis
    110 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.03 pool-13-thread-
    160 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.03 NioBlockingSele
    170 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.06 http-nio-0.0.0.
    184 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.03 http-nio-0.0.0.
    185 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.02 http-nio-0.0.0.
    186 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.39 http-nio-0.0.0.
    196 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.16 http-nio-0.0.0.
    293 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.29 http-nio-0.0.0.
    388 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.05 http-nio-0.0.0.
    402 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.06 http-nio-0.0.0.
    495 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.11 http-nio-0.0.0.
    612 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.75 http-nio-0.0.0.
    651 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.12 http-nio-0.0.0.
    846 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.11 http-nio-0.0.0.
    973 work      20   0 5070172 332464  16292 S  0.0  0.2   0:00.10 http-nio-0.0.0.

上图中可以看出pid为5433的线程占了较多的cpu资源，利用jstack命令可以继续查看该线程当前的堆栈状态。

拿到线程的16进制

work@authority-web-v1-7688dc9bf7-kr48z:~$ printf "%x" 5433
1539
work@authority-web-v1-7688dc9bf7-kr48z:~$

jstack命令生成的thread dump信息包含了JVM中所有存活的线程，为了分析指定线程，必须找出对应线程的调用栈，应该如何找？

在top命令中，已经获取到了占用cpu资源较高的线程pid，将该pid转成16进制的值，在thread dump中每个线程都有一个nid，找到对应的nid即可；隔段时间再执行一次stack命令获取thread dump，区分两份dump是否有差别，在nid=0x1539的线程调用栈中，发现该线程一直在执行HealthController类第48行的calculate方法，得到这个信息，就可以检查对应的代码是否有问题。

work@authority-web-v1-7688dc9bf7-kr48z:~$ jstack 47
2022-04-06 23:11:42
Full thread dump OpenJDK 64-Bit Server VM (25.222-b10 mixed mode):

"Attach Listener" #7763 daemon prio=9 os_prio=0 tid=0x00007fba44002000 nid=0x1ec2 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"pool-4-thread-2" #5355 prio=5 os_prio=0 tid=0x00007fba00016000 nid=0x153a waiting for monitor entry [0x00007fb9dbdfc000]
   java.lang.Thread.State: BLOCKED (on object monitor)
	at com.rrc.authority.web.controller.HealthController$Task.run(HealthController.java:41)
	- waiting to lock <0x00000000fbe5dd70> (a java.lang.Object)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

"pool-4-thread-1" #5354 prio=5 os_prio=0 tid=0x00007fba0000b000 nid=0x1539 runnable [0x00007fb9db5f6000]
   java.lang.Thread.State: RUNNABLE
	at com.rrc.authority.web.controller.HealthController$Task.Calculate(HealthController.java:48)
	at com.rrc.authority.web.controller.HealthController$Task.run(HealthController.java:41)
	- locked <0x00000000fbe5dd70> (a java.lang.Object)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

"Okio Watchdog" #4584 daemon prio=5 os_prio=0 tid=0x00007fb9c8237800 nid=0x1223 in Object.wait() [0x00007fb9db1f4000]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	at java.lang.Object.wait(Object.java:502)
	at okio.AsyncTimeout.awaitTimeout(AsyncTimeout.java:338)
	- locked <0x00000000fa902db0> (a java.lang.Class for okio.AsyncTimeout)
	at okio.AsyncTimeout$Watchdog.run(AsyncTimeout.java:313)

"Abandoned connection cleanup thread" #1216 daemon prio=5 os_prio=0 tid=0x00007fb9c8134000 nid=0x4f2 in Object.wait() [0x00007fb9dbbfa000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:144)
	- locked <0x00000000fd104958> (a java.lang.ref.ReferenceQueue$Lock)
	at com.mysql.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:43)

"Tomcat JDBC Pool Cleaner[1112280004:1649256969328]" #1215 daemon prio=5 os_prio=0 tid=0x00007fb9c804d800 nid=0x4f1 in Object.wait() [0x00007fb9db9f8000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	at java.util.TimerThread.mainLoop(Timer.java:552)
	- locked <0x00000000fd104970> (a java.util.TaskQueue)
	at java.util.TimerThread.run(Timer.java:505)

"http-nio-0.0.0.0-8088-exec-10" #923 daemon prio=5 os_prio=0 tid=0x00007fb9e4018800 nid=0x3cd waiting on condition [0x00007fb9dbaf9000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000fd1049a0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
	at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
	at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:103)
	at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:31)
	at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)

"http-nio-0.0.0.0-8088-exec-9" #796 daemon prio=5 os_prio=0 tid=0x00007fb9e4027800 nid=0x34e waiting on condition [0x00007fb9dbefd000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000fd1049a0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
	at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
	at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:103)
	at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:31)
	at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)

"http-nio-0.0.0.0-8088-exec-8" #601 daemon prio=5 os_prio=0 tid=0x00007fb9e4026800 nid=0x28b waiting on condition [0x00007fba24960000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000fd1049a0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
	at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
	at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:103)
	at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:31)
	at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)

"http-nio-0.0.0.0-8088-exec-7" #562 daemon prio=5 os_prio=0 tid=0x00007fb9e4025800 nid=0x264 waiting on condition [0x00007fb9dbcfb000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000fd1049a0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
	at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
	at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:103)
	at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:31)
	at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)

"http-nio-0.0.0.0-8088-exec-6" #445 daemon prio=5 os_prio=0 tid=0x00007fb9e4024800 nid=0x1ef waiting on condition [0x00007fb9dbffe000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000fd1049a0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
	at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
	at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:103)
	at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:31)
	at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)

"http-nio-0.0.0.0-8088-exec-5" #352 daemon prio=5 os_prio=0 tid=0x00007fb9e4023800 nid=0x192 waiting on condition [0x00007fba24d64000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000fd1049a0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
	at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
	at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:103)
	at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:31)
	at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)

"http-nio-0.0.0.0-8088-exec-4" #338 daemon prio=5 os_prio=0 tid=0x00007fb9e4022800 nid=0x184 waiting on condition [0x00007fba24c63000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000fd1049a0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
	at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
	at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:103)
	at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:31)
	at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)

"http-nio-0.0.0.0-8088-exec-3" #243 daemon prio=5 os_prio=0 tid=0x00007fb9e4021800 nid=0x125 waiting on condition [0x00007fba2415a000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000fd1049a0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
	at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
	at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:103)
	at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:31)
	at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)

"http-nio-0.0.0.0-8088-exec-2" #146 daemon prio=5 os_prio=0 tid=0x00007fb9e4021000 nid=0xc4 waiting on condition [0x00007fba2475e000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000fd1049a0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
	at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
	at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:103)
	at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:31)
	at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)

"DestroyJavaVM" #136 prio=5 os_prio=0 tid=0x00007fba8400d800 nid=0x30 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"http-nio-0.0.0.0-8088-exec-1" #135 daemon prio=5 os_prio=0 tid=0x00007fb9e4029000 nid=0xba waiting on condition [0x00007fba2425b000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000fd1049a0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
	at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
	at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:103)
	at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:31)
	at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)

"http-nio-0.0.0.0-8088-AsyncTimeout" #133 daemon prio=5 os_prio=0 tid=0x00007fba855a2800 nid=0xb9 waiting on condition [0x00007fba24a61000]
   java.lang.Thread.State: TIMED_WAITING (sleeping)
	at java.lang.Thread.sleep(Native Method)
	at org.apache.coyote.AbstractProtocol$AsyncTimeout.run(AbstractProtocol.java:1137)
	at java.lang.Thread.run(Thread.java:748)

"http-nio-0.0.0.0-8088-Acceptor-0" #132 daemon prio=5 os_prio=0 tid=0x00007fba855a2000 nid=0xb8 runnable [0x00007fba24b62000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.ServerSocketChannelImpl.accept0(Native Method)
	at sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:422)
	at sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:250)
	- locked <0x00000000fd0fd220> (a java.lang.Object)
	at org.apache.tomcat.util.net.NioEndpoint$Acceptor.run(NioEndpoint.java:456)
	at java.lang.Thread.run(Thread.java:748)

"http-nio-0.0.0.0-8088-ClientPoller-0" #118 daemon prio=5 os_prio=0 tid=0x00007fba84fcc800 nid=0xaa runnable [0x00007fba2445d000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
	at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
	at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:93)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
	- locked <0x00000000fd0fd088> (a sun.nio.ch.Util$3)
	- locked <0x00000000fd0fd070> (a java.util.Collections$UnmodifiableSet)
	- locked <0x00000000fd1380b8> (a sun.nio.ch.EPollSelectorImpl)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
	at org.apache.tomcat.util.net.NioEndpoint$Poller.run(NioEndpoint.java:790)
	at java.lang.Thread.run(Thread.java:748)

"NioBlockingSelector.BlockPoller-1" #108 daemon prio=5 os_prio=0 tid=0x00007fba85611800 nid=0xa0 runnable [0x00007fba2435c000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
	at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
	at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:93)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
	- locked <0x00000000fd0fcef0> (a sun.nio.ch.Util$3)
	- locked <0x00000000fd0fced8> (a java.util.Collections$UnmodifiableSet)
	- locked <0x00000000fd138148> (a sun.nio.ch.EPollSelectorImpl)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
	at org.apache.tomcat.util.net.NioBlockingSelector$BlockPoller.run(NioBlockingSelector.java:339)

"pool-13-thread-1" #58 prio=5 os_prio=0 tid=0x00007fba857a6000 nid=0x6e waiting on condition [0x00007fba2485f000]
   java.lang.Thread.State: TIMED_WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000fd0e8a68> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
	at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
	at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1093)
	at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
	at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

"redisMessageListenerContainer-1" #29 prio=5 os_prio=0 tid=0x00007fba85612800 nid=0x51 runnable [0x00007fba24e65000]
   java.lang.Thread.State: RUNNABLE
	at java.net.SocketInputStream.socketRead0(Native Method)
	at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
	at java.net.SocketInputStream.read(SocketInputStream.java:171)
	at java.net.SocketInputStream.read(SocketInputStream.java:141)
	at java.net.SocketInputStream.read(SocketInputStream.java:127)
	at redis.clients.util.RedisInputStream.ensureFill(RedisInputStream.java:195)
	at redis.clients.util.RedisInputStream.readByte(RedisInputStream.java:40)
	at redis.clients.jedis.Protocol.process(Protocol.java:141)
	at redis.clients.jedis.Protocol.read(Protocol.java:205)
	at redis.clients.jedis.Connection.readProtocolWithCheckingBroken(Connection.java:297)
	at redis.clients.jedis.Connection.getRawObjectMultiBulkReply(Connection.java:242)
	at redis.clients.jedis.BinaryJedisPubSub.process(BinaryJedisPubSub.java:87)
	at redis.clients.jedis.BinaryJedisPubSub.proceedWithPatterns(BinaryJedisPubSub.java:75)
	at redis.clients.jedis.BinaryJedis.psubscribe(BinaryJedis.java:2989)
	at org.springframework.data.redis.connection.jedis.JedisConnection.pSubscribe(JedisConnection.java:3050)
	at org.springframework.data.redis.listener.RedisMessageListenerContainer$SubscriptionTask.eventuallyPerformSubscription(RedisMessageListenerContainer.java:779)
	at org.springframework.data.redis.listener.RedisMessageListenerContainer$SubscriptionTask.run(RedisMessageListenerContainer.java:746)
	at java.lang.Thread.run(Thread.java:748)

"pool-10-thread-1" #28 prio=5 os_prio=0 tid=0x00007fba85cc4000 nid=0x50 waiting on condition [0x00007fba25166000]
   java.lang.Thread.State: TIMED_WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000fc9a1f00> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
	at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
	at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1093)
	at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
	at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

"pool-9-thread-1" #27 prio=5 os_prio=0 tid=0x00007fba84ebd000 nid=0x4f waiting on condition [0x00007fba483f9000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000fc8f1d50> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
	at java.util.concurrent.LinkedBlockingDeque.takeFirst(LinkedBlockingDeque.java:492)
	at java.util.concurrent.LinkedBlockingDeque.take(LinkedBlockingDeque.java:680)
	at sun.nio.fs.AbstractWatchService.take(AbstractWatchService.java:118)
	at com.renrenche.config.refresh.LocalMonitor.watchFile(LocalMonitor.java:57)
	at com.renrenche.config.refresh.LocalMonitor.run(LocalMonitor.java:46)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

"Thread-6" #26 daemon prio=5 os_prio=0 tid=0x00007fba85ca9000 nid=0x4e runnable [0x00007fba26eea000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.fs.LinuxWatchService.poll(Native Method)
	at sun.nio.fs.LinuxWatchService.access$600(LinuxWatchService.java:47)
	at sun.nio.fs.LinuxWatchService$Poller.run(LinuxWatchService.java:314)
	at java.lang.Thread.run(Thread.java:748)

"container-0" #25 prio=5 os_prio=0 tid=0x00007fba84c78800 nid=0x4d waiting on condition [0x00007fba268e6000]
   java.lang.Thread.State: TIMED_WAITING (sleeping)
	at java.lang.Thread.sleep(Native Method)
	at org.apache.catalina.core.StandardServer.await(StandardServer.java:427)
	at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer$1.run(TomcatEmbeddedServletContainer.java:166)

"ContainerBackgroundProcessor[StandardEngine[Tomcat]]" #24 daemon prio=5 os_prio=0 tid=0x00007fba84734000 nid=0x4c waiting on condition [0x00007fba269e7000]
   java.lang.Thread.State: TIMED_WAITING (sleeping)
	at java.lang.Thread.sleep(Native Method)
	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1339)
	at java.lang.Thread.run(Thread.java:748)

"Timer-0" #23 daemon prio=5 os_prio=0 tid=0x00007fba1c3b5000 nid=0x4b in Object.wait() [0x00007fba26de9000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	at java.util.TimerThread.mainLoop(Timer.java:552)
	- locked <0x00000000fa673d48> (a java.util.TaskQueue)
	at java.util.TimerThread.run(Timer.java:505)

"commons-pool-EvictionTimer" #22 daemon prio=5 os_prio=0 tid=0x00007fba1c09e000 nid=0x4a in Object.wait() [0x00007fba26ce8000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	at java.util.TimerThread.mainLoop(Timer.java:552)
	- locked <0x00000000fa394b50> (a java.util.TaskQueue)
	at java.util.TimerThread.run(Timer.java:505)

"Log4j2-Log4j2Scheduled-3" #17 daemon prio=5 os_prio=0 tid=0x00007fba848b3800 nid=0x45 waiting on condition [0x00007fba486fa000]
   java.lang.Thread.State: TIMED_WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000fa48b5e8> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
	at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
	at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1093)
	at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
	at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

"Service Thread" #12 daemon prio=9 os_prio=0 tid=0x00007fba84268000 nid=0x40 runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"C1 CompilerThread1" #11 daemon prio=9 os_prio=0 tid=0x00007fba8425b000 nid=0x3f waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"C2 CompilerThread0" #10 daemon prio=9 os_prio=0 tid=0x00007fba8425a800 nid=0x3e waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Thread-2" #9 daemon prio=5 os_prio=0 tid=0x00007fba38001000 nid=0x3d runnable [0x00007fba6c1d5000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
	at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
	at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:93)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
	- locked <0x00000000f98c50b0> (a sun.nio.ch.Util$3)
	- locked <0x00000000f98c5098> (a java.util.Collections$UnmodifiableSet)
	- locked <0x00000000f98c6de0> (a sun.nio.ch.EPollSelectorImpl)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
	at sun.net.httpserver.ServerImpl$Dispatcher.run(ServerImpl.java:352)
	at java.lang.Thread.run(Thread.java:748)

"server-timer" #7 daemon prio=5 os_prio=0 tid=0x00007fba84243800 nid=0x3b in Object.wait() [0x00007fba6c3d7000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	at java.util.TimerThread.mainLoop(Timer.java:552)
	- locked <0x00000000f98e5f90> (a java.util.TaskQueue)
	at java.util.TimerThread.run(Timer.java:505)

"Signal Dispatcher" #5 daemon prio=9 os_prio=0 tid=0x00007fba84126000 nid=0x3a runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Surrogate Locker Thread (Concurrent GC)" #4 daemon prio=9 os_prio=0 tid=0x00007fba84124800 nid=0x39 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Finalizer" #3 daemon prio=8 os_prio=0 tid=0x00007fba840f0800 nid=0x38 in Object.wait() [0x00007fba6ceb2000]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:144)
	- locked <0x00000000f9a8b6f8> (a java.lang.ref.ReferenceQueue$Lock)
	at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:165)
	at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:216)

"Reference Handler" #2 daemon prio=10 os_prio=0 tid=0x00007fba840ee000 nid=0x37 in Object.wait() [0x00007fba6cfb3000]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	at java.lang.Object.wait(Object.java:502)
	at java.lang.ref.Reference.tryHandlePending(Reference.java:191)
	- locked <0x00000000f9a8b728> (a java.lang.ref.Reference$Lock)
	at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153)

"VM Thread" os_prio=0 tid=0x00007fba840e4000 nid=0x36 runnable

"Gang worker#0 (Parallel GC Threads)" os_prio=0 tid=0x00007fba8401e800 nid=0x31 runnable

"Gang worker#1 (Parallel GC Threads)" os_prio=0 tid=0x00007fba84020000 nid=0x32 runnable

"Concurrent Mark-Sweep GC Thread" os_prio=0 tid=0x00007fba84051000 nid=0x35 runnable

"Gang worker#0 (Parallel CMS Threads)" os_prio=0 tid=0x00007fba8404d800 nid=0x33 runnable

"Gang worker#1 (Parallel CMS Threads)" os_prio=0 tid=0x00007fba8404f000 nid=0x34 runnable

"VM Periodic Task Thread" os_prio=0 tid=0x00007fba8426a800 nid=0x41 waiting on condition

JNI global references: 351

work@authority-web-v1-7688dc9bf7-kr48z:~$

很明显：线程1获取到锁，处于RUNNABLE状态，线程2处于BLOCK状态
1、locked <0x00000000fbe5dd70>说明线程1对地址为0x00000000fbe5dd70对象进行了加锁；
2、waiting to lock <0x00000000fbe5dd70> 说明线程2在等待地址为0x00000000fbe5dd70对象上的锁；
3、waiting for monitor entry [0x00007fb9dbdfc000]说明线程1是通过synchronized关键字进入了监视器的临界区，并处于”Entry Set”队列，等待monitor。

阻塞

测试代码

package com.tudou.util;

import lombok.Synchronized;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;

public class JstackTest {

    public static Executor executor = Executors.newFixedThreadPool(5);
    public static Object lock = new Object();
    public static void main(String[] args) {
        Task task1 = new Task();
        Task task2 = new Task();

        executor.execute(task1);
        executor.execute(task2);
    }
    static class Task implements Runnable {
        @Override
        public void run() {
            synchronized(lock) {
                //Calculate();
                try {
                    lock.wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }

        public void Calculate() {
            int i = 0;
            while(true) {
                i++;
            }
        }
    }
}

线程1和2都处于WAITING状态
1、线程1和2都是先locked <0x000000076bf62500>，再waiting on <0x000000076bf62500>，之所以先锁再等同一个对象，是因为wait方法需要先通过synchronized获得该地址对象的monitor；
2、waiting on <0x000000076bf62500>说明线程执行了wait方法之后，释放了monitor，进入到”Wait Set”队列，等待其它线程执行地址为0x000000076bf62500对象的notify方法，并唤醒自己。

等待

jstack Dump 日志文件中的线程状态

dump 文件里，值得关注的线程状态有：

  1. 死锁，Deadlock（重点关注）
  2. 执行中，Runnable
  3. 等待资源，Waiting on condition（重点关注）
  4. 等待获取监视器，Waiting on monitor entry（重点关注）
  5. 暂停，Suspended
  6. 对象等待中，Object.wait() 或 TIMED_WAITING
  7. 阻塞，Blocked（重点关注）
  8. 停止，Parked

引用

如何使用jstack分析线程状态

一次应用 CPU 飙高的血案排查过程

jstack

文章作者: WangQingLei
文章链接: https://qinglei1989.github.io/2022/04/05/jvm-command-jstack/
版权声明: 本博客所有文章除特別声明外，均采用 CC BY 4.0 许可协议。转载请注明来源 WangQingLei !
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