"com.google.gwt.http.client.URL" The client package in that indicates that this class is only to be used in client code, code that is compiled to JS. This is causing problems for you, as part of that class is implemented using native JS, which of course JBoss can't run.
You'll need to find another class like URL that can be used on the server. Classes that appear in GWT that can be used on the server are in the .shared or .server packages. -- 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/-/V4nXRIuYPvMJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.