the vlaue is long, i tried with abstract type signatur: public String sel(Object sel){ Long value = (Long) sel; View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4033749#4033749 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4033749