I am not sure about your configuration, but the internals of getGraphSession as as follows: | public GraphSession getGraphSession() | { | PersistenceService persistenceService = getPersistenceService(); | return (persistenceService != null ? persistenceService.getGraphSession() : null); | } | I would imagine your root cause is because getPersistenceService is returning null. Check to make sure you have something like the following in your jbpm configuration file. | <service name="persistence" factory="org.jbpm.persistence.jta.JtaDbPersistenceServiceFactory" /> | View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4213487#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...