In your persistence.xml use <property name="hibernate.cache.provider_class" value="org.jboss.ejb3.entity.OptimisticTreeCacheProviderHook"/> instead of <property name="hibernate.cache.provider_class" value="org.jboss.ejb3.entity.TreeCacheProviderHook"/>. This isn't strictly necessary though. OptimisticTreeCacheProviderHook is a trivial subclass of TreeCacheProviderHook. Both are able to detect the cache's NodeLockingScheme config and work appropriately. The only additional behavior in OptimisticTreeCacheProviderHook is it logs a WARN if the cache's NodeLockingScheme isn't OPTIMISTIC, since that suggests the user forgot to change the NodeLockingScheme. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4210531#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...