Hi ! I got the same probleme, Could you like plz to help me ! I got the following expetion : java.lang.ClassCastException: $Proxy4 while executing the line : rs = (ResultSet) myCallableStatement.getObject(2); It's seems that the connexion that I retrived from the datasource of Jboss descriptor is a proxy ! on the other side when I use the classic connection using : conn = DriverManager.getConnection(url) I have no problem ! but I'm constrained tu use the datasource connection Thank you Adil View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4026211#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...