死锁排查

1.执行死锁代码

public class DeadLockTest {
    public static void main(String[] args) throws InterruptedException {
        //a线程持有a锁，并尝试获取b锁；b线程持有b锁，并尝试获取a锁
        Object lockA = new Object();
        Object lockB = new Object();

        Thread threadA = new Thread(() -> {
            synchronized (lockA) {
                System.out.println("threadA获取到lockA，尝试获取lockB");
                try {
                    Thread.sleep(2000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                synchronized (lockB) {
                    System.out.println("threadA获取到lockA，且获取到lockB");
                }
            }
        });

        Thread threadB = new Thread(() -> {
            synchronized (lockB) {
                System.out.println("threadB获取到lockB，尝试获取lockA");
                try {
                    Thread.sleep(2000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                synchronized (lockA) {
                    System.out.println("threadB获取到lockB，且获取到lockA");
                }
            }
        });

        threadA.start();
        threadB.start();

        threadA.join();
        threadB.join();
    }
}

2.查看java进程：jsp -l 

 3.查看线程堆栈：jstack -l 96354

 最后明确说明发现了死锁