AppEngine supports it but doesn't require it. In fact, one of the reasons we went with AppEngine was because it is well-integrated with GWT through the Google Plugin for Eclipse.
See: http://code.google.com/webtoolkit/doc/latest/tutorial/appengine.html -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/9cQNVMGAZZUJ. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
