I got it working, the issue was dependencies. I needed to include the gwt extension in classpath of my Servlet Based application. I also needed to add the GWT 2.0 libraries to the Servlet app.
I will write up a document with examples so that anyone else that has this problem can fix it. I would also like to suggest throwing an error when a certain type is requested in the http header and the Restlet framework does not have a converter for it. ------------------------------------------------------ http://restlet.tigris.org/ds/viewMessage.do?dsForumId=4447&dsMessageId=2435507
