Ok, so now we're at CR2. Not the time to be changing APIs, but I understand that if we need it we need it. The callbacks in consideration are block/unblock/startTx/endTx, right? I like Jason's approach to using annotations rather than the interface methods - makes things easier for people who don't want to implement everything. What do people think? Can/should we: 1) Live with the current API 2) Add to the existing interface 3) Switch to an annotation based approach 4) Do both 2 and 3, providing users with both ways of implementing listeners? I think if we can live with (1) I suggest we do that. Failing that, I'd go with (3), since we'd be breaking compat with CR2 anyway. Then (2) and finally (4) which I think doesn't add much value. I'd like to do this for CR3, and will hold back CR3 until we have a clear decision on this. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4054818#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...