I have also encountered the similar program and somewhere in the jboss code it checks whether its a single phase or two phase commit and if its two phase commit then it set some STATUS on prepare and commit. I believe may be the reason for this is JBOSS is not able to handle the 2PC due to - a) MySQL version of j-connector which do not support 2PC. Anything earlier than 5.0 would not be have 2PC commit capabilities. I will be performing tests runs to cross check if this is the case. If anyone has any other view or explaination of this error, please let me know. - Mahendra View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3997188#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...