anonymous wrote : did you specify the dialect correctly ? do you know there is a different dialect for oracle 9 ? I thought I was using the Oracle9 dialect, but it seems that, in some way, that is not what JBoss is thinking, as I'm seeing the log: 2006-09-13 14:38:56,698 DEBUG [org.hibernate.cfg.Configuration] hibernate.dialect=org.hibernate.dialect.HSQLDialect I've just extracted the hibernate.cfg.xml from my jbpm-configs.jar inside the jbpm.ear application and yes, that's the problem, it's using the HSQL dialect. I'm going to change it and see what happens. THanks a lot. anonymous wrote : it is quite clearly explained in this other forum discussion :-) http://www.vkfz.com/hibernate-sequence-t64969.htm :-) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3971886#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...