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打印线程栈信息 打印Java程序的线程栈信息方式

天已青色等烟雨来   2021-09-10 我要评论
想了解打印Java程序的线程栈信息方式的相关内容吗天已青色等烟雨来在本文为您仔细讲解打印线程栈信息的相关知识和一些Code实例欢迎阅读和指正我们先划重点:Java线程,打印线程栈信息,程序线程栈下面大家一起来学习吧

打印Java程序的线程栈信息

jstack可以得知当前线程的运行情况

安装jstack等命令集jstack是开发版本jdk的一部分不是开发版的有可能找不到

yum install -y  java-1.8.0-openjdk-devel

查看要打印堆栈的java进程ID

jps -l

打印堆栈

sudo -u admin jstack pid  > jstack.txt

特别要注意的是jstack需要使用与进程一致的用户才能正确导出堆栈否则会报错如下

Unable to open socket file: target process not responding or HotSpot VM not loaded

线程池异常堆栈的坑

import java.util.concurrent.*;
public class DivTask implements Runnable{
    int a,b;
    public DivTask(int a, int b) {
        this.a = a;
        this.b = b;
    }
    @Override
    public void run() {
        double re = a/b;
        System.out.println(re);
    }
    public static void main(String[] args) throws InterruptedException, ExecutionException {
//        ThreadPoolExecutor executor = new ThreadPoolExecutor(0, Integer.MAX_VALUE, 0L, TimeUnit.SECONDS
//                , new SynchronousQueue<>());
        TraceThreadPoolExecutor executor = new TraceThreadPoolExecutor(0, Integer.MAX_VALUE, 0L, TimeUnit.SECONDS
                , new SynchronousQueue<>());  //扩展TraceThreadPoolExecutor
        for (int i = 0; i < 5; i++) {
            // executor.submit(new DivTask(100,i));
            //改进方式一:
            //Future re = executor.submit(new DivTask(100, i));
            //re.get();
            //改进方式二:
            executor.execute(new DivTask(100,i));
        }
        //100.0
        //25.0
        //33.0
        //50.0
        //其中100/0的异常结果没打印
        //线程池很有可能"吃掉程序抛出的异常
        //改进方式一:
        //Exception in thread "main" java.util.concurrent.ExecutionException: java.lang.ArithmeticException: / by zero
        //	at java.util.concurrent.FutureTask.report(FutureTask.java:122)
        //	at java.util.concurrent.FutureTask.get(FutureTask.java:192)
        //
        //改进方式二:
        //Exception in thread "pool-1-thread-1" java.lang.ArithmeticException: / by zero
        //	at com.Test.DivTask.run(DivTask.java:15)
        //	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        //	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        //	at java.lang.Thread.run(Thread.java:748)
        //100.0
        //33.0
        //25.0
        //50.0
        //扩展TraceThreadPoolExecutor
        //java.lang.Exception: Client stack trace
        //	at com.Test.TraceThreadPoolExecutor.clientTrace(TraceThreadPoolExecutor.java:20)
        //	at com.Test.TraceThreadPoolExecutor.execute(TraceThreadPoolExecutor.java:12)
        //	at com.Test.DivTask.main(DivTask.java:29)
        //Exception in thread "pool-1-thread-1" java.lang.ArithmeticException: / by zero
        //	at com.Test.DivTask.run(DivTask.java:15)
        //	at com.Test.TraceThreadPoolExecutor.lambda$wrap$0(TraceThreadPoolExecutor.java:25)
        //	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        //	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        //	at java.lang.Thread.run(Thread.java:748)
        //100.0
        //25.0
        //33.0
        //50.0
    }
}
import java.util.concurrent.*;
/**
 * 扩展TraceThreadPoolExecutor让它在调度任务前先保存一下提交任务线程的堆栈信息
 */
public class TraceThreadPoolExecutor extends ThreadPoolExecutor {
    public TraceThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue) {
        super(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue);
    }
    @Override
    public void execute(Runnable task) {
        super.execute(wrap(task,clientTrace(),Thread.currentThread().getName()));
    }
    @Override
    public Future<?> submit(Runnable task) {
        return super.submit(wrap(task,clientTrace(),Thread.currentThread().getName()));
    }
    private Exception clientTrace(){
        return new Exception("Client stack trace");
    }
    private Runnable wrap(final Runnable task,final Exception clientTrace,String clientThreadName){
        return () -> {
            try {
                task.run();
            } catch (Exception e) {
                clientTrace.printStackTrace();
                throw e;
            }
        };
    }
}

以上为个人经验希望能给大家一个参考也希望大家多多支持


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