打印Java程序的线程栈信息方式
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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.*;
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编程网。
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