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    <blockquote> <p>How do I throw exception to the outside of the thread?</p> </blockquote> <p>Couple ways you can do this. You can set a <code>UncaughtExceptionHandler</code> on the thread or you can use an <code>ExecutorService.submit(Callable)</code> and use the exception that you get from the <code>Future.get()</code>.</p> <p>The easiest way is to use the <code>ExecutorService</code>:</p> <pre><code>ExecutorService threadPool = Executors.newSingleThreadScheduledExecutor(); Future&lt;Void&gt; future = threadPool.submit(new Callable&lt;Void&gt;() { public Void call() throws Exception { // can throw OhNoException here return null; } }); // you need to shut down the pool after submitting the last task threadPool.shutdown(); // this can throw ExecutionException try { // this waits for your background task to finish, it throws if the task threw future.get(); } catch (ExecutionException e) { // this is the exception thrown by the call() which could be a OhNoException Throwable cause = e.getCause(); if (cause instanceof OhNoException) { throw (OhNoException)cause; } else if (cause instanceof RuntimeException) { throw (RuntimeException)cause; } } </code></pre> <p>If you want to use the <code>UncaughtExceptionHandler</code> then you can do something like:</p> <pre><code> Thread thread = new Thread(...); final AtomicReference throwableReference = new AtomicReference&lt;Throwable&gt;(); thread.setUncaughtExceptionHandler(new UncaughtExceptionHandler() { public void uncaughtException(Thread t, Throwable e) { throwableReference.set(e); } }); thread.start(); thread.join(); Throwable throwable = throwableReference.get(); if (throwable != null) { if (throwable instanceof OhNoException) { throw (OhNoException)throwable; } else if (throwable instanceof RuntimeException) { throw (RuntimeException)throwable; } } </code></pre>
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    1. COWow never seen anything like this before. I wonder if the Future thread would constantly run in the background or would it only run once and shutdown? and when does it begin?
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    2. COThe future thread begins immediately when it is submitted. It runs in the background once and then stops when the `call()` method returns @Yonk.
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