Greetings. After upgrading from v3.1.2 to v3.1.3, I started getting hibernate errors in code that has worked for months. The exact exception thrown varies slightlly, but they all have this in common: First, there is "Unknown entity: java.lang.String", and then shortly after "error in persistence service". Sometimes I also get "unable to remove timers from process instance". It seems like this happens when a process instance has completed, but I am still trying to narrow that down. Has anybody seen any similar problems? Any ideas on the root cause, and how to fix it. When I revert back to v3.1.2, the problem does not appear. Thanx. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3993061#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...