In your persistence.xml set following properties | <persistence> | <persistence-unit name="unit1"> | ... | <exclude-unlisted-classes>true</exclude-unlisted-classes> | <class>entityBean1</class> | <class>entityBean2</class> | ... | </persistence-unit> | <persistence-unit name="unit2"> | ... | <exclude-unlisted-classes>true</exclude-unlisted-classes> | <class>entityBean3</class> | <class>entityBean4</class> | ... | </persistence-unit> | | </persistence> | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4050071#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...