Gavin, It's the proper object: ....model.PlayerPlay@7f59c7 The line that looks interesting in the trace is: Caused by: java.lang.IllegalArgumentException: Could not set field value by reflection: PlayerActionBean.selectedPlayerPlay on: com.example.SomeBean with value: class com.example.model.PlayerPlay So, it's trying to set the @In property on the session bean that is injected with @EJB. This exception happens whenever (and only when) I call a method on the injected (with @EJB) session bean. If I don't call any methods on SomeBean then there's no exception, if I do then it triest o inject selectedPlayerPlay.... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3984340#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...