It looks like this is a class loader problem. The MBean manages to read a .properties file from the fuse package but can't load classes from the same package. I can manufacture the same stack trace on first deploy of the MBean if I don't add the fuse package classes to the jar file. If I don't add the .properties file to the jar file then I get a different stack trace. I'm guessing that the class loader isn't being configured properly when the MBean is deployed a second time. Regards Doug View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3966780#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...