手写java死锁和线上排查死锁

package com.Test;

import jdk.internal.dynalink.linker.LinkerServices;
import org.omg.CORBA.Current;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Currency;
import java.util.List;

/**
 * @author ZFX
 * @date2019/5/18 9:47.
 */
class shareModel implements Runnable{

    private String lockA;
    private String lockB;
    public shareModel(String lockA,String lockB){
        this.lockB=lockB;
        this.lockA=lockA;
    }

    @Override
    public void run() {
        synchronized (lockA){
            System.out.println("等待A");
            try {
                Thread.sleep(1000);//获取死锁的效果明显
                synchronized (lockB){
                    System.out.println("获取锁B");
                }
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

        }
    }
}
public class test {
    public static void main(String[] args) {
        String lockA = "lockA";
        String lockB = "lockB";
        new Thread(new shareModel(lockA,lockB),"VVVVV").start();
        new Thread(new shareModel(lockB,lockA),"BBBBB").start();
    }
}

上面是简单的手写死锁的代码

死锁的线上排查方法

jps -l 查找正在运行的java程序的pid

jastack -pid 就能查到死锁的位置