Ensure that packets are never lost even if thread pool is exhausted. JM-491

git-svn-id: http://svn.igniterealtime.org/svn/repos/messenger/trunk@3192 b35dd754-fafc-0310-a699-88a17e54d16e

src/java/org/jivesoftware/messenger/server/OutgoingSessionPromise.java

@@ -71,7 +71,7 @@ public class OutgoingSessionPromise implements RoutableChannelHandler {
         threadPool =
                 new ThreadPoolExecutor(Math.round(maxThreads/4), maxThreads, 60, TimeUnit.SECONDS,
                         new LinkedBlockingQueue<Runnable>(),
-                        new ThreadPoolExecutor.AbortPolicy());
+                        new ThreadPoolExecutor.DiscardOldestPolicy());
 
         // Start the thread that will consume the queued packets. Each pending packet will
         // be actually processed by a thread of the pool (when available). If an error occurs