title: GWT ASync call back problem
body: <p>I'm trying to learn GWT and I have been following the tutorial guides on Google's site for GWT here <a href="http://code.google.com/intl/sv/webtoolkit/doc/latest/tutorial/RPC.html" rel="nofollow">http://code.google.com/intl/sv/webtoolkit/doc/latest/tutorial/RPC.html</a></p>
  
  <p>I have reach the end of <code>3. Serializing Java objects</code> part of the tutorial and I couldn't get it to work. Basically I'm getting some error when calling the ASync service.</p>
  
  <p>I have located the error to be here when. And yea the creation of that object fails thus the error is caught. I don't know if I have to continue on to the next step, but it says on the end of part 3 of the tutorial that I should get some numbers.</p>
  
  <pre><code>    AsyncCallback&lt;StockPrice[]&gt; callback = new AsyncCallback&lt;StockPrice[]&gt;() {
        public void onFailure(Throwable caught) {
          // TODO: Do something with errors.
        }
  </code></pre>
  
  <p>All the files needed to reproduce this is found on the homepage. Anyway anyone know what possible could be wrong here? This is the error output</p>
  
  <pre><code>[WARN] stockPriceServiceImpl: An IncompatibleRemoteServiceException was thrown while processing this call.
  com.google.gwt.user.client.rpc.IncompatibleRemoteServiceException: This application is out of date, please click the refresh button on your browser. ( Expecting version 5 from client, got 6. )
      at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.prepareToRead(ServerSerializationStreamReader.java:432)
      at com.google.gwt.user.server.rpc.RPC.decodeRequest(RPC.java:236)
      at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:186)
      at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:224)
      at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
      at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
      at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
      at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
      at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
      at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729)
      at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
      at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
      at org.mortbay.jetty.handler.RequestLogHandler.handle(RequestLogHandler.java:49)
      at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
      at org.mortbay.jetty.Server.handle(Server.java:324)
      at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
      at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:843)
      at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:647)
      at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
      at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
      at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
      at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)
  </code></pre>