jdb

jdb官方

操作实例

import java.util.concurrent.TimeUnit;

public class Hello {
    public static void main(String[] args) throws InterruptedException {
        int wait = 20;
        if (args.length > 0) {
            wait = Integer.parseInt(args[0]);
        }
        int i = 0;
        while (i++ < wait) {
            System.out.println(i);
            TimeUnit.SECONDS.sleep(10);
        }
        System.out.println("exit...");
    }
}

编译

// com.sun.tools.example.debug.expr.ParseException: Name unknown: wait
// wait = null
javac -g Hello.java #没有-g参数，jdb print 变量 如上错误

执行

# win 系统指令有差异
java -Xdebug -Xrunjdwp:transport=dt_socket,address=8888,server=y,suspend=y Hello

IDEA Remote Debug