Looks more like that your code has registered a Window.addResizeHandler() and that registered handler has some code of the form someInstance.isShowing() and "someInstance" is null.
To get the real exception from the resize handler you need to inspect UmbrellaException.getCauses(). -- J. -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-web-toolkit+unsubscr...@googlegroups.com. To post to this group, send email to google-web-toolkit@googlegroups.com. Visit this group at http://groups.google.com/group/google-web-toolkit. For more options, visit https://groups.google.com/d/optout.
