Ingo, Can you get to the point it's breaking with a debugger, or can you insert code there? It's hard for me to picture a classloader problem in this scenario, but that may just be my lack of imagination. Have you looked at DocumentFactory.instance() to see what it does? Is it possible that you have a configuration problem where it really is returning an object of the wrong class? public static synchronized DocumentFactory getInstance() { | if (singleton == null) { | singleton = createSingleton(); | } | return (DocumentFactory) singleton.instance(); | } -Ed Staub View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4026238#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...