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_2
lock resource_1
接下来在终端中输入jsp查看当前运行的java程序：
7480 testJstack
13420 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 runnable JNI global references: 576 Found 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.
