Hum, it seems we make a big step because there is still the same exception, but now, he first display this : QuerySplitter] no persistent classes found for query class: | | select ti | from org.jbpm.scheduler.exe.Timer as ti | where ti.exception is null | and ti.isSuspended != true | order by ti.dueDate asc | | | 16:09:35,047 INFO [STDOUT] java.lang.IllegalArgumentException: not a Hibernate iterator But this classes (org.jbpm.scheduler.exe.Timer) exists. I see another hbm.xml into org.jbpm.scheduler.exe.timer, must I had it to in mapping of hibernate.cfg.xml? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3999498#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...