You can't pass a query result directly to GWT because the object that contains the results does not implement Serializable. For a workaround, see the last post in this thread:
http://groups.google.com/group/google-appengine-java/browse_thread/thread/bce6630a3f01f23a - Jason On Mon, Sep 7, 2009 at 3:17 AM, webnazar <[email protected]> wrote: > > Mudassar Nazar: Software Engineer > > I found this is not the problem, it is an issue. i persisted data > class through gwt rpc successfully > but failed while loading the following error is found while loading > data class through gwt rpc. it is a bu, need to fix > > Sep 7, 2009 3:32:55 PM > com.google.appengine.tools.development.ApiProxyLocalImpl log > SEVERE: [1252317775578000] javax.servlet.ServletContext log: Exception > while dispatching incoming RPC call > com.google.gwt.user.client.rpc.SerializationException: Type > 'org.datanucleus.store.appengine.query.StreamingQueryResult' was not > included in the set of types which can be serialized by this > SerializationPolicy or its Class object could not be loaded. For > security purposes, this type will not be serialized. > at > > com.google.gwt.user.server.rpc.impl.StandardSerializationPolicy.validateSerialize > (StandardSerializationPolicy.java:83) > at > > com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize > (ServerSerializationStreamWriter.java:591) > at > > com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject > (AbstractSerializationStreamWriter.java:129) > at > com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter > $ValueWriter$8.write(ServerSerializationStreamWriter.java:146) > at > > com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue > (ServerSerializationStreamWriter.java:530) > at com.google.gwt.user.server.rpc.RPC.encodeResponse(RPC.java:573) > at com.google.gwt.user.server.rpc.RPC.encodeResponseForSuccess > (RPC.java:441) > at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse > (RPC.java:529) > at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall > (RemoteServiceServlet.java:166) > at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost > (RemoteServiceServlet.java:86) > at javax.servlet.http.HttpServlet.service(HttpServlet.java:713) > at javax.servlet.http.HttpServlet.service(HttpServlet.java:806) > at > org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java: > 487) > at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter > (ServletHandler.java:1093) > at > com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter > (TransactionCleanupFilter.java:43) > at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter > (ServletHandler.java:1084) > at com.google.appengine.tools.development.StaticFileFilter.doFilter > (StaticFileFilter.java:121) > at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter > (ServletHandler.java:1084) > at org.mortbay.jetty.servlet.ServletHandler.handle > (ServletHandler.java:360) > 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:712) > at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java: > 405) > at > com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle > (DevAppEngineWebAppContext.java:54) > at org.mortbay.jetty.handler.HandlerWrapper.handle > (HandlerWrapper.java:139) > at com.google.appengine.tools.development.JettyContainerService > $ApiProxyHandler.handle(JettyContainerService.java:313) > at org.mortbay.jetty.handler.HandlerWrapper.handle > (HandlerWrapper.java:139) > at org.mortbay.jetty.Server.handle(Server.java:313) > at > org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java: > 506) > at org.mortbay.jetty.HttpConnection$RequestHandler.content > (HttpConnection.java:844) > at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:644) > at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:205) > at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381) > at org.mortbay.io.nio.SelectChannelEndPoint.run > (SelectChannelEndPoint.java:396) > at org.mortbay.thread.BoundedThreadPool$PoolThread.run > (BoundedThreadPool.java:442) > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en -~----------~----~----~----~------~----~------~--~---
