Salaboy, thank you for your reply. I'm a beginner of Jbpm. I'm sorry that I'm still not clear about: 1. How to "use the JbpmContext to handle your transaction"? Can you give an example? 2. Why the basic configuration works for me if no Hibernate second level cache? I have maybe 3 Jbpm engines run on 3 different machine, don't I need any special cluster configuration? How Jbpm engines synchronize (for example, the status of JbpmContext) with each other? Looking forward your further help! View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4191125#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...