Bug searching and testing of the @MappedSuperClass ensures me that it works as I hoped. I am sorry for using thread space for such errors when my frustration growed after reading x documents. The compiler error (which was indeed strange) was my own fault (who else). In my source I used "extend Entity" which made the compiler think that I was trying to extend javax.persistence.Entity and not the Entity class in my package. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3959879#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...