JVM調優之jstack找出發生死鎖的線程

1、執行死鎖程序

2、執行 jstack -l 21733 | more

結果如下：

死鎖程序：

public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println("start the example------");
final Object obj_1 = new Object();
final Object obj_2 = new Object();

Thread t1 = new Thread("t1") {
@Override
public void run() {
synchronized (obj_1) {
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
synchronized (this) {
}
synchronized (obj_2) {
System.out.println("thread t1 done");
}
}
}
};
Thread t2 = new Thread("t2") {
public void run() {
synchronized (obj_2) {
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

synchronized (obj_1) {
System.out.println("thread t2 done.");
}

}
}
};

t1.start();
t2.start();
}