"timfox" wrote : In the MDB case, are you consuming messages in using MDBs in one app server from a messaging server in a different app server instance, or is it all colocated? JBoss Messaging and the server hosting the mdbs are two different machines. The mdbs are depoyed scoped, using the JCA resource adapter. Also, we have nothing else colocated on the JBoss Messaging instance. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4045820#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...