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    <p>To answer your second question, I think you are doing a reasonable job trying to clean up your thread pool. </p> <p>With respect to your first question, I think the method that you want to use is <a href="http://java.sun.com/javase/6/docs/api/java/util/concurrent/AbstractExecutorService.html#submit%28java.util.concurrent.Callable%29" rel="nofollow noreferrer">submit</a> rather than <code>execute</code>. Rather than try to explain it all in text, here's an edited fragment from a unit test that I wrote that makes many tasks, has each of them do a fragment of the total work and then meets back at the starting point to add the results:</p> <pre><code>final AtomicInteger messagesReceived = new AtomicInteger(0); // ThreadedListenerAdapter is the class that I'm testing // It's not germane to the question other than as a target for a thread pool. final ThreadedListenerAdapter&lt;Integer&gt; adapter = new ThreadedListenerAdapter&lt;Integer&gt;(listener); int taskCount = 10; List&lt;FutureTask&lt;Integer&gt;&gt; taskList = new ArrayList&lt;FutureTask&lt;Integer&gt;&gt;(); for (int whichTask = 0; whichTask &lt; taskCount; whichTask++) { FutureTask&lt;Integer&gt; futureTask = new FutureTask&lt;Integer&gt;(new Callable&lt;Integer&gt;() { @Override public Integer call() throws Exception { // Does useful work that affects messagesSent return messagesSent; } }); taskList.add(futureTask); } for (FutureTask&lt;Integer&gt; task : taskList) { LocalExecutorService.getExecutorService().submit(task); } for (FutureTask&lt;Integer&gt; task : taskList) { int result = 0; try { result = task.get(); } catch (InterruptedException ex) { Thread.currentThread().interrupt(); } catch (ExecutionException ex) { throw new RuntimeException("ExecutionException in task " + task, ex); } assertEquals(maxMessages, result); } int messagesSent = taskCount * maxMessages; assertEquals(messagesSent, messagesReceived.intValue()); </code></pre> <p>I think this fragment is similar to what you're trying to do. The key components were the <a href="http://java.sun.com/javase/6/docs/api/java/util/concurrent/AbstractExecutorService.html#submit%28java.util.concurrent.Callable%29" rel="nofollow noreferrer">submit</a> and <a href="http://java.sun.com/javase/6/docs/api/java/util/concurrent/FutureTask.html#get%28%29" rel="nofollow noreferrer">get</a> methods.</p>
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