I don't want to be a pest, but could someone at least tell me if what I'm trying to do should work (hence I should try harder to understand what I've misconfigured), or if I should just give up and use my work around (separate queries for each subclass)? I'm using JBoss AS 4.2.1.GA and Seam 2.0.0.CR1 Thanks anonymous wrote : Can EJBQL be used to query polymorphically? I cannot find any examples in the spec or in Bill Burke's EJB3 book, and my attempts are always returning null. | | Code: | l = entityManager.createQuery("SELECT s FROM Security s").getResultList(); | | | Here I'm trying to find all rows of all security subclasses. Even though the database has many such entries, the query always returns null. I can find each subclass independently - eg.: | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4089470#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...