| org.hibernate.MappingException: Unknown entity: org.jbpm.pvm.internal.id.PropertyImpl | looks like your hibernate mapping is wrong, as far as I know there is a new table introduced in 4.2, the mapping is in "jbpm.repository.hbm.xml" | <class name="org.jbpm.pvm.internal.id.PropertyImpl" table="JBPM4_PROPERTY"> | <id name="key" column="KEY_"> | <generator class="assigned" /> | </id> | <version name="version" column="VERSION_"/> | <property name="value" column="VALUE_"/> | </class> | which is exactly what your installation is missing, there is an upgrade script, a good blog about this is here: http://www.jorambarrez.be/blog/2009/10/30/new-feature-in-jbpm-4-2-auto-up... hope this makes your hibernate happy View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4265317#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...