Okay, thanks Salvador, I will see that :o)
On 6 mai, 11:17, Salvador Diaz <[email protected]> wrote:
> Everybody seems to be missing this since app engine for java was
> released. Try reading the GWT Developer Guide guys, you'll find all
> kinds of interesting and useful stuff.
>
> Anyway, the problem is that you can't use any
> org.datanucleus.store.appengine.* classes in your client-side code.
> You have to use the DTO pattern.
>
> Here's one of the discussions related to this topic from a couple of
> days
> ago:http://groups.google.com/group/Google-Web-Toolkit/browse_thread/threa...
>
> You could also try searching the forum, that'd keep us from answering
> the same question for the n-th time.
>
> Hope that helps;
>
> Salvador
>
> PS: The relevant part of the developer documentation discussing this
> is
> here:http://code.google.com/webtoolkit/doc/1.6/DevGuideCodingBasics.html#D...
>
> On May 6, 11:01 am, Paul Robinson <[email protected]> wrote:
>
>
>
> > Your onFailure method ignores the Throwable it's given. Maybe it
> > contains something useful?
>
> > Ouaibou wrote:
> > > Hello,
>
> > > I have a problem with the callback of a RPC call. I have post in
> > > appengine forum because i think it was a problem with the appengine
> > > datastore, but Max Ross suggests me to post here :
>
> > >http://groups.google.com/group/google-appengine-java/browse_thread/th...
>
> > > In order to summarize :
>
> > > I have two classes AudioFile and Genre. AudioFile as a field of type
> > > Genre. Both are marked as detachable like Max says me. I add an
> > > AudioFile in the datastore and then i do a RPC call in the client side
> > > in order to retrieve the data :
>
> > > this.gtunesService.getAudioFiles(new AsyncCallback<List<AudioFile>>()
> > > {
> > > public void onFailure(Throwable caught) {
> > > SC.say(Gtunes.SERVER_ERROR);
> > > }
> > > public void onSuccess(List<AudioFile> result)
> > > {
> > > Gtunes.this.audioFiles = result;
> > > String buf = "";
> > > for (AudioFile af :
> > > Gtunes.this.audioFiles) {
> > > buf += "genre = " + af.getGenre
> > > ().getName() + " - "
> > > + af.getName()
> > > + "<br />";
> > > }
> > > SC.say(buf);
> > > }
> > > });
>
> > > The problem is in the server side with the following code :
>
> > > public List<AudioFile> getAudioFiles() {
> > > List<AudioFile> audioFiles = null;
> > > PersistenceManager pm = PMF.get().getPersistenceManager();
>
> > > try {
> > > Query q = pm.newQuery(AudioFile.class);
> > > q.setOrdering("name");
> > > audioFiles = new
> > > ArrayList<AudioFile>((List<AudioFile>) q.execute
> > > ());
> > > pm.detachCopyAll(audioFiles);
> > > } finally {
> > > pm.close();
> > > }
>
> > > System.out.println("list = " + audioFiles);
> > > for (AudioFile audioFile : audioFiles) {
> > > System.out.println("name = " + audioFile.getName() +
> > > "\n");
> > > }
>
> > > return audioFiles;
> > > }
>
> > > audioFiles contains my data. But the return has a problem because i
> > > enter in the onFailure in the client side but without any error.
>
> > > However, i see that if i change the line :
>
> > > audioFiles = new ArrayList<AudioFile>((List<AudioFile>) q.execute());
>
> > > for :
>
> > > audioFiles = (List<AudioFile>) q.execute();
>
> > > I have get the following error :
>
> > > 5 mai 2009 22:23:23
> > > com.google.appengine.tools.development.ApiProxyLocalImpl log
> > > SEVERE: [1241555003875000] 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.validateSer
> > > ialize
> > > (StandardSerializationPolicy.java:83)
> > > at
> > > com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.seriali
> > > ze
> > > (ServerSerializationStreamWriter.java:591)
> > > at
> > > com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.write
> > > Object
> > > (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.seriali
> > > zeValue
> > > (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 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
> > > $ApiProxyHandler.handle(JettyContainerService.java:306)
> > > at org.mortbay.jetty.handler.HandlerWrapper.handle
> > > (HandlerWrapper.java:139)
> > > at org.mortbay.jetty.Server.handle(Server.java:313)
> > > at org.mortbay.jetty.HttpConnection.handleRequest
> > > (HttpConnection.java:
> > > 506)
> > > at org.mortbay.jetty.HttpConnection$RequestHandler.content
> > > (HttpConnection.java:844)
> > > at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:
> > > 644)
> > > at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:
> > > 211)
> > > 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)
>
> > > I don't know where to see in order to debug. Does someone has an
> > > idea ?
>
> > > Thanks.
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