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POWhy is UncaughtExceptionHandler not called by ExecutorService?
 

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  1. POWhy is UncaughtExceptionHandler not called by ExecutorService?
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    <p>I've stumbled upon a problem, that can be summarized as follows:</p> <p>When I create the thread manually (i.e. by instantiating <code>java.lang.Thread</code>) the <code>UncaughtExceptionHandler</code> is called appropriately. However, when I use an <code>ExecutorService</code> with a <code>ThreadFactory</code> the handler is ommited. What did I miss?</p> <pre><code>public class ThreadStudy { private static final int THREAD_POOL_SIZE = 1; public static void main(String[] args) { // create uncaught exception handler final UncaughtExceptionHandler exceptionHandler = new UncaughtExceptionHandler() { @Override public void uncaughtException(Thread t, Throwable e) { synchronized (this) { System.err.println("Uncaught exception in thread '" + t.getName() + "': " + e.getMessage()); } } }; // create thread factory ThreadFactory threadFactory = new ThreadFactory() { @Override public Thread newThread(Runnable r) { // System.out.println("creating pooled thread"); final Thread thread = new Thread(r); thread.setUncaughtExceptionHandler(exceptionHandler); return thread; } }; // create Threadpool ExecutorService threadPool = Executors.newFixedThreadPool(THREAD_POOL_SIZE, threadFactory); // create Runnable Runnable runnable = new Runnable() { @Override public void run() { // System.out.println("A runnable runs..."); throw new RuntimeException("Error in Runnable"); } }; // create Callable Callable&lt;Integer&gt; callable = new Callable&lt;Integer&gt;() { @Override public Integer call() throws Exception { // System.out.println("A callable runs..."); throw new Exception("Error in Callable"); } }; // a) submitting Runnable to threadpool threadPool.submit(runnable); // b) submit Callable to threadpool threadPool.submit(callable); // c) create a thread for runnable manually final Thread thread_r = new Thread(runnable, "manually-created-thread"); thread_r.setUncaughtExceptionHandler(exceptionHandler); thread_r.start(); threadPool.shutdown(); System.out.println("Done."); } } </code></pre> <p>I expect: Three times the message "Uncaught exception..."</p> <p>I get: The message once (triggered by the manually created thread). </p> <p>Reproduced with Java 1.6 on Windows 7 and Mac OS X 10.5.</p>
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