Hey, Has anyone figured this out. I'm trying to overide the JBoss xalan XPath api with Saxon so I can use XPath 2.0 functionallity but I get this error when I remove the xalan.jar file from the lib/endorsed directory and place my saxon jars there instead. If I leave the xalan.jar file there then for some reason jaxp still shooses the xalan api instead, even if I set the System Property to Saxon. Thank you, Steve. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3984634#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...