IDEA 配置
run / Edit Configurations
添加 jvm remote debug
填写名称  
远程机器ip  及 debug 端口


写一个简单的 HelloForDebug 用来远程debug

package hello;
import java.time.LocalDateTime;
import java.util.concurrent.atomic.AtomicLong;
public class HelloForDebug {
    private static final AtomicLong count = new AtomicLong(0);
    public static void main(String[] args) throws Exception {
        while(true){
            long currentCount = count.get();
            System.out.println("currentCount="+currentCount);
            System.out.println("now time is "+ LocalDateTime.now());
            Thread.sleep(3000);
        }
    }
}

java -cp .  -Xdebug -Xnoagent -Xrunjdwp:transport=dt_socket,address=8010,server=y,suspend=n hello.HelloForDebug

idea 配置好 远程debug信息 
运行 debug 
在 循环里 断点即可


远程 debug 一个简单的 http server

启动http server
java -cp .  -Xdebug -Xnoagent -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n  nanohttpd.HelloServer
Listening for transport dt_socket at address: 8000
Listening on port 8080. Hit Enter to stop.

http server 代码见
https://gitee.com/dyyx/hellocode/tree/master/src/nanohttpd



 java HTTP Server NanoHttpd 
 java debug 原理简介