Well, this is caused by "Xerces outstanding feature" where xerces makes it impossible to merge node trees created in different document builders :-( Your workaround to your problem is to use: org.jboss.wsf.common.DOMUtils.getDocumentBuilder() method instead of the following block of code: DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); | dbf.setNamespaceAware(true); | DocumentBuilder db = dbf.newDocumentBuilder(); This is the only way for you to use the same document builder by which your SOAP message was created. Richard View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4091533#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...