I've made another test with a stripped version of your process. I've removed the decision handlers, and made a direct transition from fork to join in one of the branches. This is the result: | HSQLDB: 3.2.2: OK, 3.2.3: OK | Oracle: 3.2.2: FAILED, 3.2.3: OK | Postgres: 3.2.2: FAILED, 3.2.3: OK | The session.flush() in org.jbpm.graph.node.Join was introduced in 3.2.3. I'll test this with 3.3.0 later or tomorrow. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4196640#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...