IncompatibleRemoteServiceException : The response can not be Deserialized

Folks,

I try to answer as many questions on the GWT forums as I can, but alas this one has stumped me the last few evenings. I'm converting RunPartner.com, my hobbist distance running site, from ExtJs to GWT having built GWT apps for the last 2 years since GWT rocks.

I searched the old postings and found that the following two had the same issue, but both traced it to the wrong version of gwt-servlet. I'm using GWT 2.5.0 compiled via the gwt-maven-plugin and with all 2.5.0 dependencies. Also using GWTP. A check in the output war shows only the gwt-servlet-2.5.0.jar there. So I'm stumped.

• Serialization Exception with List
• Cannot deserialized ArrayList object in GWT 2.3

The issue

I know there are a bunch of reasons things could fail to serialize, and I've checked all of those and I kept getting this issue. At first I though it was because of my custom serializers, or Hibernate usage, or constructors. But, when you hit one of those, the error message tells you so. This one tells nothing extra:

So, I got rid of all of that. I just made a method that passes a Double. Nothing magic there. And the issue persists despite Maven clean/rebuild or Eclipse clean or building the whole thing and just running it as JS/Tomcat.

So, I'm curious if there is any stone I've left unturned. Note that I know the wireup is correct however as when I pass a boolean through as the return type it jives, but not any non-primitive. On sending the Double below, I can see it serialized coming over the wire in the XHR fine, but the client always throws the error whether in DevMode or as a compiled war.

Hopefully I've missed something simple. Thanks for any pointers you can provide. :)

Service usage:

DoubleService.Util.getInstance().getDouble(new AsyncCallback<Double>() {        @Override      public void onFailure(Throwable caught) {          Window.alert("Error fetching double: "+caught.getMessage());        }        @Override      public void onSuccess(Double result) {          Window.alert("Double is: "+result);      }  });

Service interface

@RemoteServiceRelativePath("services/doubleService")  public interface DoubleService extends RemoteService {        Double getDouble();  }

Backend impl:

@Service("doubleService")  public class DoubleServiceImpl implements DoubleService {        @Override      public Double getDouble() {          return 1.46D;      }    }

Async Interface (generated by GWT Mvn Plugin):

public interface DoubleServiceAsync  {      /**         * GWT-RPC service  asynchronous (client-side) interface       * @see DoubleService       */      void getDouble( AsyncCallback<java.lang.Double> callback );        /**       * Utility class to get the RPC Async interface from client-side code       */      public static final class Util       {           private static DoubleServiceAsync instance;            public static final DoubleServiceAsync getInstance()          {              if ( instance == null )              {                  instance = (DoubleServiceAsync) GWT.create( DoubleService.class );              }              return instance;          }            private Util()          {              // Utility class should not be instanciated <- spelling error Thomas!          }      }  }

Sincerely,

Joseph

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