title: AtmosphereResource become null
body: <p>I'm tryin' to develop a small gwt chat application Atmosphere's gwt extension. The server side part of application take care about incoming AtmosphereResource associating a Broadcaster and suspending it. 
  Here is the code snippet about suspending a new incoming AtmosphereResource:</p>
  
  <pre><code>private void doGet(AtmosphereResource ar, String userId) {
      if(BroadcasterFactory.getDefault().lookup(userId) != null) {
      ar.setBroadcaster(BroadcasterFactory.getDefault().lookup(userId).addAtmosphereResource(ar));
      } else {
              ar.setBroadcaster(BroadcasterFactory.getDefault().get(userId).addAtmosphereResource(ar));
      }
      ar.suspend();
      ...
  }
  </code></pre>
  
  <p>When I look for that AtmosphereResource, using it's previously stored uuid, I always found it null:</p>
  
  <pre><code>...
  AtmosphereResource arTarget = AtmosphereResourceFactory.getDefault().find(uuid);            
  if (arTarget != null)   {
      arTarget.getBroadcaster().broadcast(msg,arTarget);
  } else {
      log.info("handleRawMessage:no broadcaster "+((RawMessage) msg).toString());
  }
  ...
  </code></pre>
  
  <p>What's wrong? I also notice that AtmosphereResources got rapidly onResume, as they immediately time out, but timeout is set to -1. Did I miss something? This is a snippet of my pom to.</p>
  
  <pre><code>&lt;dependency&gt;
      &lt;groupId&gt;org.atmosphere.extensions&lt;/groupId&gt;
      &lt;artifactId&gt;atmosphere-gwt20-client&lt;/artifactId&gt;
      &lt;version&gt;2.1.1&lt;/version&gt;
  &lt;/dependency&gt;
  &lt;dependency&gt;
      &lt;groupId&gt;org.atmosphere.extensions&lt;/groupId&gt;
      &lt;artifactId&gt;atmosphere-gwt20-common&lt;/artifactId&gt;
      &lt;version&gt;2.1.1&lt;/version&gt;
  &lt;/dependency&gt;
  &lt;dependency&gt;
      &lt;groupId&gt;org.atmosphere.extensions&lt;/groupId&gt;
      &lt;artifactId&gt;atmosphere-gwt20-server&lt;/artifactId&gt;
      &lt;version&gt;2.1.1&lt;/version&gt;
  &lt;/dependency&gt;
  &lt;dependency&gt;
      &lt;groupId&gt;org.atmosphere&lt;/groupId&gt;
      &lt;artifactId&gt;atmosphere-runtime&lt;/artifactId&gt;
      &lt;version&gt;2.1.1&lt;/version&gt;
  &lt;/dependency&gt;
  </code></pre>