Ok thanks, this answers my question. I didn't realize that your comment was only about the implementation itself (of the classloaders) and didn't include classes like ClassLoaderMetadata. I agree that if the basic rules (hierarchical model,...) are followed then there should not be any issues. Thanks for the clarification. Gilles. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4125144#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...