Do not call fillMaps(); in a getter. I think it will solve all of your problems. Good place to call it in the factory method or like that. Then, I think you misunderstand this line model.put("(Empty)","-1"); // Add EMPTY element if needed It is EMPTY element. It is needed to choose null value. If you do not need null values just remove this line. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3973907#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...