The configuration seems ok to me. Possible things you should look at: - Are you sure you didn't change anything on the test? - Can you try the same test again, after dropping/creating your database (or clearing the data on the tables). - Are you sure you have your UDP working fine? - Do you have both nodes on the same box I assume? If not, check your JGroups configs. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4113963#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...