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    <p>As stated in the <a href="http://download.oracle.com/javase/7/docs/api/index.html?java/util/concurrent/ExecutorService.html">documentation</a>, you cannot reuse an <code>ExecutorService</code> that has been shut down. I'd recommend against any <em>workarounds</em>, since (a) they may not work as expected in all situations; and (b) you can achieve what you want using standard classes.</p> <p>You must either</p> <ol> <li><p>instantiate a new <code>ExecutorService</code>; or</p></li> <li><p>not terminate the <code>ExecutorService</code>.</p></li> </ol> <p>The first solution is easily implemented, so I won't detail it.</p> <p>For the second, since you want to execute an action once all the submitted tasks have finished, you might take a look at <a href="http://download.oracle.com/javase/7/docs/api/index.html?java/util/concurrent/ExecutorCompletionService.html"><code>ExecutorCompletionService</code></a> and use it instead. It wraps an <code>ExecutorService</code> which will do the thread management, but the runnables will get wrapped into something that will tell the <code>ExecutorCompletionService</code> when they have finished, so it can report back to you:</p> <pre><code>ExecutorService executor = ...; ExecutorCompletionService ecs = new ExecutorCompletionService(executor); for (int i = 0; i &lt; totalTasks; i++) { ... ecs.submit(...); ... } for (int i = 0; i &lt; totalTasks; i++) { ecs.take(); } </code></pre> <p>The method <code>take()</code> on the <code>ExecutorCompletionService</code> class will block until a task has finished (either normally or abruptly). It will return a <code>Future</code>, so you can check the results if you wish.</p> <p>I hope this can help you, since I didn't completely understand your problem.</p>
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    1. COhow do i force stopping the threads or cancel all tasks ? using exectuer.shutdownNow() ? will it work fine even with this wrapper?
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