Thanks for your thoughts on this. Basically, there is a fundamental flaw in the way JBC deals with Sync callbacks, in that we only commit stuff in the cache in the afterCompletion() callback. There are good reasons why we do this, but in the end it is incorrect and we are working on a better mechanism, one of which is to implement XA interfaces. See http://jira.jboss.org/jira/browse/JBCACHE-70. Sadly, it is not currently high on the prio list since the workaround currently in place works for most JTA compliant TMs out there. Feel free to vote on the JIRA though to bump up it's prio. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4135911#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...