I fixed the deployment problem by changing jboss-portal.sar\META-INF\jboss-service.xml. Specifically, I commented out the attribute definition for CacheNaturalId. Question for the JBoss Portal development team: should the attribute CacheNaturalId be defined in these mbeans? <!-- The different containers --> | <mbean | code="org.jboss.portal.core.impl.model.instance.PersistentInstanceContainer" | name="portal:container=Instance" | xmbean-dd="" | xmbean-code="org.jboss.portal.common.system.JBossServiceModelMBean"> | <xmbean/> | <depends>portal:service=Hibernate,type=Instance</depends> | <depends | optional-attribute-name="PortletInvoker" | proxy-type="attribute">portal:service=PortletInvoker,type=Instance</depends> | <depends | optional-attribute-name="PortalAuthorizationManagerFactory" | proxy-type="attribute">portal:service=PortalAuthorizationManagerFactory</depends> | <depends | optional-attribute-name="AuthorizationDomainRegistry" | proxy-type="attribute">portal:service=AuthorizationDomainRegistry</depends> | <attribute name="SessionFactoryJNDIName">java:/portal/InstanceSessionFactory</attribute> | <!--attribute name="CacheNaturalId">true</attribute--> | </mbean> | <mbean | code="org.jboss.portal.core.impl.model.portal.PersistentPortalObjectContainer" | name="portal:container=PortalObject" | xmbean-dd="" | xmbean-code="org.jboss.portal.common.system.JBossServiceModelMBean"> | <xmbean/> | <depends>portal:service=Hibernate,type=PortalObject</depends> | <depends | optional-attribute-name="PortalAuthorizationManagerFactory" | proxy-type="attribute">portal:service=PortalAuthorizationManagerFactory</depends> | <depends | optional-attribute-name="AuthorizationDomainRegistry" | proxy-type="attribute">portal:service=AuthorizationDomainRegistry</depends> | <depends | optional-attribute-name="PortalEventListenerRegistry" | proxy-type="attribute">portal:service=ListenerRegistry</depends> | <attribute name="SessionFactoryJNDIName">java:/portal/PortalObjectSessionFactory</attribute> | <!--attribute name="CacheNaturalId">true</attribute--> | </mbean> View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4024620#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...