You indicated that you do not have a xerces jar in your app. But there might be another one lurking somewhere. Try adding "-verbose:class" to the JAVA_OPTS in run.bat and running again. This option should tell you which jar files are being used to load the org.apache.xerces.jaxp.SAXParserFactoryImpl and javax.xml.parsers.SAXParserFactory classes. That might help you locate the stray jar file. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4217153#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...