jps,jstack检测java死锁

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import java.util.concurrent.CountDownLatch;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;   /**   * Hello world!   */   public class App {       public static void main(String[] args) throws InterruptedException {            System.out.println("Hello World!");            ExecutorService executorService = Executors.newFixedThreadPool(2);            byte[] i = new byte[0];            byte[] j = new byte[0];            final CountDownLatch countDownLatch = new CountDownLatch(2);            executorService.execute(new DeadThread1(i, j,countDownLatch));            executorService.execute(new DeadThread2(i, j,countDownLatch));            countDownLatch.await();            System.out.println("done !!!");        }            public static class DeadThread1 implements Runnable {                private byte[] i;            private byte[] j;            private CountDownLatch countDownLatch;                public DeadThread1(byte[] i, byte[] j, CountDownLatch countDownLatch) {                this.i = i;                this.j = j;                this.countDownLatch = countDownLatch;            }                    @Override            public void run() {                synchronized (i) {                    try {                        Thread.sleep(1000);                    } catch (InterruptedException e) {                        e.printStackTrace();                      }                    synchronized (j) {                        System.out.println(Thread.currentThread().getName() + "is running!!");                        countDownLatch.countDown();                    }                }            }        }            public static class DeadThread2 implements Runnable {                private byte[] i;            private byte[] j;            private CountDownLatch countDownLatch;                public DeadThread2(byte[] i, byte[] j, CountDownLatch countDownLatch) {                this.i = i;                this.j = j;                this.countDownLatch = countDownLatch;            }                    @Override            public void run() {                synchronized (j) {                    try {                        Thread.sleep(1000);                    } catch (InterruptedException e) {                        e.printStackTrace();                      }                    synchronized (i) {                        System.out.println(Thread.currentThread().getName() + "is running!!");                        countDownLatch.countDown();                    }                }            }        }    }

2014-07-14 14:19:12Full thread dump Java HotSpot(TM) 64-Bit Server VM (23.3-b01 mixed mode):"RMI TCP Connection(5)-192.168.3.100" daemon prio=6 tid=0x000000000d6ed800 nid=0x5374 in Object.wait() [0x000000000ea1d000]   java.lang.Thread.State: TIMED_WAITING (on object monitor)at java.lang.Object.wait(Native Method)- waiting on <0x00000007d65fb068> (a com.sun.jmx.remote.internal.ArrayNotificationBuffer)at com.sun.jmx.remote.internal.ArrayNotificationBuffer.fetchNotifications(Unknown Source)- locked <0x00000007d65fb068> (a com.sun.jmx.remote.internal.ArrayNotificationBuffer)at com.sun.jmx.remote.internal.ArrayNotificationBuffer$ShareBuffer.fetchNotifications(Unknown Source)at com.sun.jmx.remote.internal.ServerNotifForwarder.fetchNotifs(Unknown Source)at javax.management.remote.rmi.RMIConnectionImpl$2.run(Unknown Source)at javax.management.remote.rmi.RMIConnectionImpl$2.run(Unknown Source)at javax.management.remote.rmi.RMIConnectionImpl.fetchNotifications(Unknown Source)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)at java.lang.reflect.Method.invoke(Unknown Source)at sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)at sun.rmi.transport.Transport$1.run(Unknown Source)at sun.rmi.transport.Transport$1.run(Unknown Source)at java.security.AccessController.doPrivileged(Native Method)at sun.rmi.transport.Transport.serviceCall(Unknown Source)at sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)at java.lang.Thread.run(Unknown Source)"RMI TCP Connection(4)-192.168.3.100" daemon prio=6 tid=0x000000000d6ed000 nid=0x21fc runnable [0x000000000e91e000]   java.lang.Thread.State: RUNNABLEat java.net.SocketInputStream.socketRead0(Native Method)at java.net.SocketInputStream.read(Unknown Source)at java.net.SocketInputStream.read(Unknown Source)at java.io.BufferedInputStream.fill(Unknown Source)at java.io.BufferedInputStream.read(Unknown Source)- locked <0x00000007d68b0830> (a java.io.BufferedInputStream)at java.io.FilterInputStream.read(Unknown Source)at sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)at java.lang.Thread.run(Unknown Source)"RMI TCP Connection(3)-192.168.3.100" daemon prio=6 tid=0x000000000d4ac800 nid=0x60 runnable [0x000000000e81e000]   java.lang.Thread.State: RUNNABLEat java.net.SocketInputStream.socketRead0(Native Method)at java.net.SocketInputStream.read(Unknown Source)at java.net.SocketInputStream.read(Unknown Source)at java.io.BufferedInputStream.fill(Unknown Source)at java.io.BufferedInputStream.read(Unknown Source)- locked <0x00000007d680e408> (a java.io.BufferedInputStream)at java.io.FilterInputStream.read(Unknown Source)at sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)at java.lang.Thread.run(Unknown Source)"JMX server connection timeout 15" daemon prio=6 tid=0x000000000d44b800 nid=0x6184 in Object.wait() [0x000000000e61f000]   java.lang.Thread.State: TIMED_WAITING (on object monitor)at java.lang.Object.wait(Native Method)- waiting on <0x00000007d63eee88> (a [I)at com.sun.jmx.remote.internal.ServerCommunicatorAdmin$Timeout.run(Unknown Source)- locked <0x00000007d63eee88> (a [I)at java.lang.Thread.run(Unknown Source)"RMI Scheduler(0)" daemon prio=6 tid=0x000000000d44a000 nid=0x4c60 waiting on condition [0x000000000e51e000]   java.lang.Thread.State: TIMED_WAITING (parking)at sun.misc.Unsafe.park(Native Method)- parking to wait for  <0x00000007d61dc568> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)at java.util.concurrent.locks.LockSupport.parkNanos(Unknown Source)at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(Unknown Source)at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(Unknown Source)at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(Unknown Source)at java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source)at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)at java.lang.Thread.run(Unknown Source)"RMI TCP Accept-0" daemon prio=6 tid=0x000000000d71b000 nid=0x5d04 runnable [0x000000000e31e000]   java.lang.Thread.State: RUNNABLEat java.net.DualStackPlainSocketImpl.accept0(Native Method)at java.net.DualStackPlainSocketImpl.socketAccept(Unknown Source)at java.net.AbstractPlainSocketImpl.accept(Unknown Source)at java.net.PlainSocketImpl.accept(Unknown Source)- locked <0x00000007d61ea968> (a java.net.SocksSocketImpl)at java.net.ServerSocket.implAccept(Unknown Source)at java.net.ServerSocket.accept(Unknown Source)at sun.management.jmxremote.LocalRMIServerSocketFactory$1.accept(Unknown Source)at sun.rmi.transport.tcp.TCPTransport$AcceptLoop.executeAcceptLoop(Unknown Source)at sun.rmi.transport.tcp.TCPTransport$AcceptLoop.run(Unknown Source)at java.lang.Thread.run(Unknown Source)"pool-1-thread-2" prio=6 tid=0x000000000b866800 nid=0x2004 waiting for monitor entry [0x000000000d3cf000]   java.lang.Thread.State: BLOCKED (on object monitor)at App$DeadThread2.run(App.java:72)- waiting to lock <0x00000007d5ca5c18> (a [B)- locked <0x00000007d5ca5c28> (a [B)at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)at java.lang.Thread.run(Unknown Source)"pool-1-thread-1" prio=6 tid=0x000000000b861000 nid=0x1814 waiting for monitor entry [0x000000000d2cf000]   java.lang.Thread.State: BLOCKED (on object monitor)at App$DeadThread1.run(App.java:43)- waiting to lock <0x00000007d5ca5c28> (a [B)- locked <0x00000007d5ca5c18> (a [B)at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)at java.lang.Thread.run(Unknown Source)"Service Thread" daemon prio=6 tid=0x000000000b84a000 nid=0x40b4 runnable [0x0000000000000000]   java.lang.Thread.State: RUNNABLE"C2 CompilerThread1" daemon prio=10 tid=0x000000000b83a800 nid=0x4a24 waiting on condition [0x0000000000000000]   java.lang.Thread.State: RUNNABLE"C2 CompilerThread0" daemon prio=10 tid=0x000000000b830800 nid=0x4da0 waiting on condition [0x0000000000000000]   java.lang.Thread.State: RUNNABLE"Attach Listener" daemon prio=10 tid=0x000000000b82f800 nid=0x3744 waiting on condition [0x0000000000000000]   java.lang.Thread.State: RUNNABLE"Signal Dispatcher" daemon prio=10 tid=0x000000000b82c000 nid=0x5bf4 runnable [0x0000000000000000]   java.lang.Thread.State: RUNNABLE"Finalizer" daemon prio=8 tid=0x000000000b7a6800 nid=0x49ec in Object.wait() [0x000000000cbcf000]   java.lang.Thread.State: WAITING (on object monitor)at java.lang.Object.wait(Native Method)- waiting on <0x00000007d5c05798> (a java.lang.ref.ReferenceQueue$Lock)at java.lang.ref.ReferenceQueue.remove(Unknown Source)- locked <0x00000007d5c05798> (a java.lang.ref.ReferenceQueue$Lock)at java.lang.ref.ReferenceQueue.remove(Unknown Source)at java.lang.ref.Finalizer$FinalizerThread.run(Unknown Source)"Reference Handler" daemon prio=10 tid=0x000000000b79d800 nid=0x4c0c in Object.wait() [0x000000000cace000]   java.lang.Thread.State: WAITING (on object monitor)at java.lang.Object.wait(Native Method)- waiting on <0x00000007d5c05320> (a java.lang.ref.Reference$Lock)at java.lang.Object.wait(Object.java:503)at java.lang.ref.Reference$ReferenceHandler.run(Unknown Source)- locked <0x00000007d5c05320> (a java.lang.ref.Reference$Lock)"main" prio=6 tid=0x0000000000c5e000 nid=0x3300 waiting on condition [0x00000000024bf000]   java.lang.Thread.State: WAITING (parking)at sun.misc.Unsafe.park(Native Method)- parking to wait for  <0x00000007d5ca5f90> (a java.util.concurrent.CountDownLatch$Sync)at java.util.concurrent.locks.LockSupport.park(Unknown Source)at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(Unknown Source)at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(Unknown Source)at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(Unknown Source)at java.util.concurrent.CountDownLatch.await(Unknown Source)at App.main(App.java:17)"VM Thread" prio=10 tid=0x000000000b790000 nid=0x2c48 runnable "GC task thread#0 (ParallelGC)" prio=6 tid=0x000000000289d800 nid=0x2584 runnable "GC task thread#1 (ParallelGC)" prio=6 tid=0x000000000289f000 nid=0x4e5c runnable "GC task thread#2 (ParallelGC)" prio=6 tid=0x00000000028a1000 nid=0x7584 runnable "GC task thread#3 (ParallelGC)" prio=6 tid=0x00000000028a3000 nid=0x24d0 runnable "VM Periodic Task Thread" prio=10 tid=0x000000000b858800 nid=0x41a4 waiting on condition JNI global references: 231Found one Java-level deadlock:============================="pool-1-thread-2":  waiting to lock monitor 0x000000000b8680e8 (object 0x00000007d5ca5c18, a [B),  which is held by "pool-1-thread-1""pool-1-thread-1":  waiting to lock monitor 0x000000000b7a62b0 (object 0x00000007d5ca5c28, a [B),  which is held by "pool-1-thread-2"Java stack information for the threads listed above:==================================================="pool-1-thread-2":at App$DeadThread2.run(App.java:72)- waiting to lock <0x00000007d5ca5c18> (a [B)- locked <0x00000007d5ca5c28> (a [B)at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)at java.lang.Thread.run(Unknown Source)"pool-1-thread-1":at App$DeadThread1.run(App.java:43)- waiting to lock <0x00000007d5ca5c28> (a [B)- locked <0x00000007d5ca5c18> (a [B)at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)at java.lang.Thread.run(Unknown Source)Found 1 deadlock.

使用图形工具 jconsole 同样可以检测到：

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