kukeltje, thank you very much for your reply. As per your answer, can I understand that: jBPM haven't any session level talk. Then I have 2 questions (please excuse me that I'm a very beginer of jBPM): 1. How can jBPM adapt into J2EE cluster environment? 2. jBPM may lock 1 DB record for a very long time or have some tricky mechanism? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4192066#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...