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.
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