Imagine a JPQL query like this: SELECT JSON{id : p.id, name : p.name, age : p.age} FROM Person p WHERE id=?1 Ok, i know this is impossible (Actually). But if i could find a Way to Add NamedQueries dynamically to the EntityManagerFactory , i could implement this by Myself. Someone here know how to do that? I'm actually adding Annotated Classes and generating the EntityManagerFactory dynamically doing this: Ejb3Configuration ejb3conf = new Ejb3Configuration(); | ..... | ejb3conf.addAnnotatedClass(aClass); | ... | EntityManagerFactory emf = ejb3conf.buildEntityManagerFactory(); p.s: Sorry, i'm brazilian, and my english isn't so good. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4264932#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...