"mark.little(a)jboss.com" wrote : The message store should be implementation agnostic. It certainly started out that way. JCR is good as a specific type of implementation, but that should not be forced through to the front-end service interface. Agree 100%. I thought to don't change interface, but only the current JCR implementation. Are you saying it would be impossible, and I have to take care also to review the front-end interface (keeping of course in mind it have to be implementation agnostic)? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4152403#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...