如何打印Java程序的线程栈信息

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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 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;            }        };    }}

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