Originally from http://groups.google.com/group/google-web-toolkit-contributors/browse_thread/thread/1b67cfebede416b7/e958579badd4613a?lnk=gst&q=pjulien+dvsDataMap#e958579badd4613a
and other posts. I've now reported http://code.google.com/p/google-web-toolkit/issues/detail?id=5776 and included a sample. The sample is concise and direct and shows off an assertion failure. -- http://groups.google.com/group/Google-Web-Toolkit-Contributors