Using JSON with Google App Engine and Restlet?

[webpost]

Hi,

Is anyone using JSON with Google App Engine and Restlet? I think everything is 
set up correctly, I have a post handler like this:

  @Post
  public String acceptRepresentation(Form form) {
      JSONObject json = new JSONObject();
      json.put("farm", "horse");
  
      return json.toString();
  }

and in my project's gwt.xml file I have:

  <inherits name="com.google.gwt.json.JSON" /> 
  <inherits name="com.google.gwt.http.HTTP" />

but when I run the project I now just get an error page like:

  com/google/gwt/json/client/JSONValue

  You can get technical details here.
  Please continue your visit at our home page. 

anyone else have this working? (Without the json usage, everything is working 
fine)

Thanks

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