死锁编码及定位分析

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死锁编码及定位分析

class Resource{
    String re_a = "re_a";
    String re_b = "re_b";
}

public class Test {
    public static void main(String[] args) {
        Resource s = new Resource();
        new Thread(()->{
            synchronized (s.re_a){
                System.out.println(Thread.currentThread().getName()+"得到"+s.re_a);
                synchronized (s.re_b){
                    System.out.println(Thread.currentThread().getName()+"得到"+s.re_b);
                }
            }
        },"A").start();

        new Thread(()->{
            synchronized (s.re_b){
                System.out.println(Thread.currentThread().getName()+"得到"+s.re_b);
                synchronized (s.re_a){
                    System.out.println(Thread.currentThread().getName()+"得到"+s.re_a);
                }
            }
        },"B").start();
    }
}

输出

A得到re_a
B得到re_b

jps命令定位进程号

G:\IDE\Project\java-juc>jps -l
17044
33300 sun.tools.jps.Jps
7044
5448 death_lock.Test
19788
24748 org.jetbrains.jps.cmdline.Launcher

jstack 进程号 查看进程

G:\IDE\Project\java-juc>jstack 5448
...
...
...
Java stack information for the threads listed above:
===================================================
"B":
        at death_lock.Test.lambda$main$1(Test.java:26)
        - waiting to lock <0x00000000d5f36810> (a java.lang.String)
        - locked <0x00000000d5f36840> (a java.lang.String)
        at death_lock.Test$$Lambda$2/1747585824.run(Unknown Source)
        at java.lang.Thread.run(Thread.java:748)
"A":
        at death_lock.Test.lambda$main$0(Test.java:17)
        - waiting to lock <0x00000000d5f36840> (a java.lang.String)
        - locked <0x00000000d5f36810> (a java.lang.String)
        at death_lock.Test$$Lambda$1/1078694789.run(Unknown Source)
        at java.lang.Thread.run(Thread.java:748)

Found 1 deadlock.