This seems to be a known Hibernate Bug. See http://opensource.atlassian.com/projects/hibernate/browse/HHH-2477 for more information. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4140003#4140003 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4140003