Hey Koen, I just reorganized the BPEL project structure and noticed the actual QName class used by JBoss comes from lib/endorsed/xml-apis.jar. Section 4.1.4 of the manual guides you through replacing the default implementations of the XML APIs. However, the JDK 1.5 subsection says that only the TrAX implementation has issues. This is true, except for the binary incompatibility above. To solve the incompatibility, add the following entry to the process deployment template: <path id="servicegen.classpath"> | ... | <!-- uncomment to replace the TrAX implementation in Java SE 1.5.0 --> | <pathelement location="${jbpm.bpel.home}/lib/xalan/xalan-2.6.0.jar"/> | <!-- replace the JAXP implementation --> | <pathelement location="${jbpm.bpel.home}/lib/xerces/xml-apis.jar"/> | <pathelement location="${jbpm.bpel.home}/lib/xerces/xercesImpl.jar"/> | </path> View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3960751#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...