Hi everyone! I had the same issue when moving to JBoss 4.2 and nlmarco's method solved it, albeit I don't want to go into production like that. Thing is, my production DB is MySQL 4.1.20, which does not support XA. Since JBoss can support 1 non-XA resource, I was wondering if the other resource involved (where timers are persisted) can be substituted by a XA-aware resource. But I have no idea what mechanism JBoss uses to store timers. Does anyone one? Is it a proprietary DB? Can it be changed to another DB? How? Thank you! View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4078929#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...