Hello All, previously, I thought that the org.jbpm.pvm.internal.session.DbSession is a abstraction of database session(e.g. org.hibernate.Session), so that we can make the implementation pluggable. but I also found that the org.hibernate.Session reference is diffused everywhere(e.g. some jpdl activity), is that programmical mistake or Tom has another intention? best regards! View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4238363#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...