OnJava8-Examples/threads/CaptureUncaughtException.java

// threads/CaptureUncaughtException.java
// (c)2016 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
import java.util.concurrent.*;
import onjava.TimedAbort;

class ExceptionThread2 implements Runnable {
  @Override
  public void run() {
    Thread t = Thread.currentThread();
    System.out.println("run() by " + t.getName());
    System.out.println(
      "eh = " + t.getUncaughtExceptionHandler());
    throw new RuntimeException();
  }
}

class MyUncaughtExceptionHandler implements
Thread.UncaughtExceptionHandler {
  @Override
  public void uncaughtException(Thread t, Throwable e) {
    System.out.println("caught " + e);
  }
}

class HandlerThreadFactory implements ThreadFactory {
  @Override
  public Thread newThread(Runnable r) {
    System.out.println(this + " creating new Thread");
    Thread t = new Thread(r);
    System.out.println("created " + t);
    t.setUncaughtExceptionHandler(
      new MyUncaughtExceptionHandler());
    System.out.println(
      "eh = " + t.getUncaughtExceptionHandler());
    return t;
  }
}

public class CaptureUncaughtException {
  public static void main(String[] args) {
    new TimedAbort(4);
    ExecutorService exec = Executors.newCachedThreadPool(
      new HandlerThreadFactory());
    exec.execute(new ExceptionThread2());
  }
}
/* Output:
HandlerThreadFactory@14991ad creating new Thread
created Thread[Thread-1,5,main]
eh = MyUncaughtExceptionHandler@d93b30
run() by Thread-1
eh = MyUncaughtExceptionHandler@d93b30
HandlerThreadFactory@14991ad creating new Thread
created Thread[Thread-2,5,main]
eh = MyUncaughtExceptionHandler@28e402
caught java.lang.RuntimeException
TimedAbort 4
*/