title: Grails 2.0, Atmosphere-Plugin and WebSockets
body: <p>I am trying to get a sample WebSocket app running on grails 2.0 with jetty 7.5 in dev mode. I generated a simple AtmosphereHandler, but whenever I try to connect via a WebSocket I get the following error message:</p>
  
  <p>E</p>
  
  <pre><code>rror 2011-11-24 17:18:32,075 ["http-bio-8080"-exec-4] ERROR [/jet2].[StratosphereServlet]  - Servlet.service() for servlet [StratosphereServlet] in context with path [/jet2] threw exception
  Message: null
     Line | Method
  -&gt;&gt; 197 | upgrade         in org.eclipse.jetty.websocket.WebSocketFactory
  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
  |   320 | acceptWebSocket in     ''
  |    78 | service . . . . in org.eclipse.jetty.websocket.WebSocketServlet
  |    26 | doFilter        in org.grails.plugin.resource.DevModeSanityFilter
  |   886 | runTask . . . . in java.util.concurrent.ThreadPoolExecutor$Worker
  |   908 | run             in     ''
  ^   619 | run . . . . . . in java.lang.Thread
  </code></pre>
  
  <p>Any suggestions as to what might be the rpoblem are highly appreciated. Best wishes Peter, Switzerland</p>