Alejandro, to change HibernateHelper in a compatible way is probably for you. To make a change in a compatible way, essentially means that you can only add stuff. Incompatible change in behaviour is almost impossible to detect unless yo have especially designed compatibility tests, which jbpm3 does not have. Hence special care is needed when it comes to behavioural change. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4196463#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...