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命令：jstack 进程号
用于检测线程是否存在死锁，通过打印出jvm线程栈来进行跟踪
实例：
Found one Java-level deadlock:
=============================
"Thread-1":
waiting for ownable synchronizer 0x00000007d6e6dab8, (a java.util.concurrent.locks.ReentrantLock$NonfairSync),
which is held by "Thread-0"
"Thread-0":
waiting for ownable synchronizer 0x00000007d6e6dae8, (a java.util.concurrent.locks.ReentrantLock$NonfairSync),
which is held by "Thread-1"
Java stack information for the threads listed above:
===================================================
"Thread-1":
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000007d6e6dab8> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:867)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1197)
at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:214)
at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:290)
at com.test.jdk.DeadLockTest$2.run(DeadLockTest.java:40)
at java.lang.Thread.run(Thread.java:745)
"Thread-0":
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000007d6e6dae8> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:867)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1197)
at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:214)
at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:290)
at com.test.jdk.DeadLockTest$1.run(DeadLockTest.java:21)
at java.lang.Thread.run(Thread.java:745)
Found 1 deadlock.
可以发现线程1和线程0形成了死锁。
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原文地址：http://blog.csdn.net/zhaozhenzuo/article/details/46289053
