首先，编写一个死锁程序

1 package deadlock; 2  3 public class testJstack { 4     final static Object resource_1 = new Object(); 5     final static Object resource_2 = new Object(); 6  7     public static void main(String[] args) { 8         Thread t1 = new Thread("t1") { 9             public void run() {10                 synchronized (resource_1) {11                     try {12                         Thread.sleep(3000);13                     } catch (InterruptedException e) {14                     }15                     System.out.println("locked resource_1");16                     synchronized (resource_2) {17                         System.out.println("thread t1 done.");18                     }19                 }20             }21         };22 23         Thread t2 = new Thread("t2") {24             public void run() {25                 synchronized (resource_2) {26                     System.out.println("locked resource_2");27                     synchronized (resource_1) {28                         System.out.println("thread t2 done.");29                     }30                 }31             }32         };33         t1.start();34         t2.start();35     }36 }

程序运行结果是：

lock resource_2lock resource_1

接下来在终端中输入jsp查看当前运行的java程序：

7480 testJstack13420 Jps

获取testJstack的进程ID为7480.然后使用命令：

jstack -l 7480 >deadlock.jstack

将jstack检测结果放入文件deadlock.jstack。使用vim查看该文件：

java.lang.Thread.State: RUNNABLE   Locked ownable synchronizers:        - None   java.lang.Thread.State: RUNNABLE   java.lang.Thread.State: BLOCKED (on object monitor)        at testJstack$2.run(testJstack.java:29)        - waiting to lock <0x8c087670> (a java.lang.Object)        - locked <0x8c087678> (a java.lang.Object)   java.lang.Thread.State: BLOCKED (on object monitor)        at testJstack$1.run(testJstack.java:15)   Locked ownable synchronizers:        - None   java.lang.Thread.State: RUNNABLE   Locked ownable synchronizers:        - None   java.lang.Thread.State: RUNNABLE   Locked ownable synchronizers:   java.lang.Thread.State: RUNNABLE   java.lang.Thread.State: WAITING (on object monitor)        at java.lang.Object.wait(Native Method)        - locked <0x8c050b30> (a java.lang.ref.ReferenceQueue$Lock)   Locked ownable synchronizers:        - None        - waiting on <0x8c050a30> (a java.lang.ref.Reference$Lock)        at java.lang.Object.wait(Object.java:485)        - locked <0x8c050a30> (a java.lang.ref.Reference$Lock)   Locked ownable synchronizers:"VM Thread" prio=10 tid=0x0807e800 nid=0x260c runnableJNI global references: 576Found one Java-level deadlock:============================="t2":  which is held by "t1""t1":  which is held by "t2"Java stack information for the threads listed above:==================================================="t2":        at testJstack$2.run(testJstack.java:29)        - waiting to lock <0x8c087670> (a java.lang.Object)        - locked <0x8c087678> (a java.lang.Object)"t1":        at testJstack$1.run(testJstack.java:15)        - waiting to lock <0x8c087678> (a java.lang.Object)        - locked <0x8c087670> (a java.lang.Object)Found 1 deadlock.