GWT packages Apache Xerces 2.11 into gwt-dev.jar but in your class path is a different version (maybe an older one) before the gwt-dev.jar class path entry. This causes GWT to use a Xerces version that has a different API for org.apache.xerces.dom.ElementNSImpl.setUserData() which causes your exception.
So you can either make sure that gwt-dev.jar is the first entry in your class path or you must update the Xerces library in your project. -- 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 [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/google-web-toolkit. For more options, visit https://groups.google.com/d/optout.
