User development, A new message was posted in the thread "null pointer exception when integrating jbpm4.3,spring2.5.6,hibernate3": http://community.jboss.org/message/530511#530511 Author : Ronald van Kuijk Profile : http://community.jboss.org/people/kukeltje Message: -------------------------------------------------------------- Sorry, I formulated wrongly... I should have said:   I see in your config that the file that should contain the mapping for PropertyImpl is there (jbpm.reposititory.hbm.xml), but does it contain this mapping. If not, check if you have the latests config files -------------------------------------------------------------- To reply to this message visit the message page: http://community.jboss.org/message/530511#530511