The EntityConverter checks to see if the object passed to it is annotated with @Entity. One of the objects being converted isn't marked with @Entity. This is because it has been enhanced by javassist. Now, I'm no expert on javaassist but I think that it essentially creates a proxy, and passes method invocations to the the object (when the converter checks for @Entity it is scanning the proxy, not the object). I would guess that the problematic object is #{currentItem.catalogue} - is currentItem a Seam JavaBean? If so I will see if I can cope with enhanced objects in the converter when I have a moment. I also obviously need to look at my resourcebundle loading (I think it's now possible to delegate it entirely to Seam). View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3993109#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...