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
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yum install -y java-1.8.0-openjdk-devel |
查看要打印堆栈的java进程ID
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jps -l |
打印堆栈
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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
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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 }} |
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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服务器之家。
原文链接：https://blog.csdn.net/x356982611/article/details/96147628
