After some JavaScript debugging, we found the error. We are using a custom formatter for GWT 2.2 logging which extends the abstract java.util.logging.Formatter. This works as long we don't call the method formatMessage(LogRecord record) of the base class. The call of formatMessage causes the error.
I think this might be a GWT bug. Should I create a bug report? -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. 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.
