死锁检测工具

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可视化检测工具

“cmd” -> jvisualvm，打开 “Java VisualVM”

命令行检测工具

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# 找到我们的程序id
jps -l

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# 查看线程情况
jstack 9896

死锁案例代码

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public class DeadLockTest {
    private Object object1 = new Object();
    private Object object2 = new Object();

    public static void main(String[] args) {
        final DeadLockTest deadLockTest = new DeadLockTest();

        Thread thread01 = new Thread(new Runnable() {
            @Override
            public void run() {
                while (true) {
                    deadLockTest.method01();
                    try {
                        Thread.sleep(100);
                    } catch (InterruptedException e) {

                    }
                }
            }
        }, "thread01");

        Thread thread02 = new Thread(new Runnable() {
            @Override
            public void run() {
                while (true) {
                    deadLockTest.method02();
                    try {
                        Thread.sleep(100);
                    } catch (InterruptedException e) {

                    }
                }
            }
        }, "thread02");

        thread01.start();
        thread02.start();
    }

    public void method01() {
        synchronized (object1) {
            synchronized (object2) {
                System.out.println("method01 invoked");
            }
        }
    }

    public void method02() {
        synchronized (object2) {
            synchronized (object1) {
                System.out.println("method02 invoked");
            }
        }
    }
}
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