Ah... this is just because of the names... Ok... got it. I Just wonder if wouldn't be better to use composed object keyts than two PostOffices. This is just an idea. Something like: public class Key | { | String name; | int type; // 1 for queue, 2 for topic | | ... implementing hashes and equals | } | | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3974741#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...