Arthas解决CPU飙高和定位死锁问题，JProfiler解决OOM问题

Arthas下载地址：
https://github.com/alibaba/arthas/releases/download/arthas-all-4.0.4/arthas-bin.zip
下载之后进入找到arthas-boot.jar，然后执行以下命令

java -jar arthas-boot.jar

选择你需要监控的进程输入序号即可

我监控控制层

package com.hwg.logger.demos.web;

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

@Slf4j
/**
 * @author <a href="mailto:[e-mail]">theonefx</a>
 */

@RestController
public class BasicController {
    public Object lock1 = new Object();
    public Object lock2 = new Object();
    
   
    @GetMapping("/loop")
    public void  loop1(){
        log.info("loop");
        while (true){

        }
    }

    @GetMapping("/loop2")
    public void  loop2(){
        log.info("loop2");
        while (true){

        }
    }
    @GetMapping("/loop3")
    public void  loop3(){
        log.info("loop3");
        while (true){

        }
    }
    @GetMapping("/deadlock")
    public void DL() {
        new Thread(()->{
            synchronized (lock1){
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                synchronized (lock2){
                    log.info("lock1 over");
                }
            }
        }).start();
        new Thread(()->{
            synchronized (lock2){
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                synchronized (lock1){
                    log.info("lock2 over");
                }
            }
        }).start();

    }
}

Arthas定位CPU飙高

使用Postman分别发送3个请求导致CPU反复处理死循环

Arthas定位死锁

定位死锁

thread -b

JProfiler定位OOM

设置vm启动参数

-Xms100m -Xmx100m -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=./dump.hprof

用破解版jprofiler打开hprof文件，发现是ArrayList发生oom