Alright, I found two generated entities with the @Version annotation on a property. One property was a Date and the other a String. According to the JavaDoc for @Version, it cannot be applied to either type. I don't know why the seamgen/hbm2ddl marked a property of type String with @Version, but the property of type Date is understandable given that @Version can apply to sql TIMESTAMP. At least that is what I gather. After removing the @Version annotations, the error went away. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4125980#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...