I changed the persistence-dev.xml to the following and it fixed all issues. I don't know why seam-gen creates a version with more parameters/properties that confuses JBoss... <?xml version="1.0" encoding="UTF-8"?> | <!-- Persistence deployment descriptor for dev profile --> | <persistence xmlns="http://java.sun.com/xml/ns/persistence" | xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" | version="1.0"> | | <persistence-unit name="shimsPUN"> | <provider>org.hibernate.ejb.HibernatePersistence</provider> | <jta-data-source>java:/SHIMSDatasource</jta-data-source> | </persistence-unit> | | </persistence> View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4088218#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...