Hi, please post the content of the MBean archive (you can use "jar tf MyJar.jar" for this) Where in this jar (or included jars) are located the following classes: RuleManagerLocal, RuleBaseBuilder, RuleEngineBean and DataLoaderThread? I think you don't need to play with the Classloader, this should hopefully work out of the box. But I am not sure. Best regards Wolfgang View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4241733#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...