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// lowlevel/CaptureUncaughtException.java

// (c)2017 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

import java.util.concurrent.*;

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) {

ExecutorService exec =

Executors.newCachedThreadPool(

new HandlerThreadFactory());

exec.execute(new ExceptionThread2());

exec.shutdown();

}

}

/* Output:

HandlerThreadFactory@4e25154f creating new Thread

created Thread[Thread-0,5,main]

eh = MyUncaughtExceptionHandler@70dea4e

run() by Thread-0

eh = MyUncaughtExceptionHandler@70dea4e

caught java.lang.RuntimeException

*/