Ok :-) Thanks ! BTW we have got a workaround using reflection. The objects which are returned from the web services , we are using reflection in the delegates to instantiate and invoke methods. This is working. What we have understood that the problem lies with the different classloaders being used to load , thats why the Linkage error. We will keep on trying if you could provide us any lead toward a solution that would be very helpful. Regards Partha View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4196872#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...