RequestFactory cannot set a Ref argument on EntityProxy (Objectify)

Hi,

Please let me know if this is not the place for this kind of questions...

I am using Objectify with RequestFactory. I have an objectify Entity called Entry with an attribute of type Ref<?>. Following Objectify recommendations, I declare the getter and setter for that kind of argument as:

@Parent Ref<Topic> topic;

public Topic getTopic() {

return topic.get();

}

public void setTopic(Topic topic) {

this.topic = Ref.create(topic);

}

(Topic is an Entity as well)

Now on the client side I want to create a new Entry with some user content and attach to that Entry the Topic which I happen to have already in the client (brought it before with RequestFactory). So I do:

entry.setText(review); //an String

entry.setTopic(topic);

entryService.saveEntry(entry).fire(new Receiver......)

However, I always receive a very weird null Exception on the Receiver's onFailure: 

• getMessage gives: Error: Server Error: null
  
• stacktracestring is null
  
• requestContext is com.mmr.shared.service.EntryServiceImpl@5d95bef6, which is my service implementation but I have put a breakpoint and it never gets in.
  

When I remove the setTopic call, the service succeeds (as long as I deal with the then null argument). So I believe the problem is in the setTopic but I don't know how to solve it neither how to workaround.

Can you help me? I am a newbie to GWT and Web programming in general but this seems to me like pretty basic functionality in order to add items to a graph.

Thanks!

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