Hi, Is it possible to pass/return interface as an argument in web service calls? I want to pass/return an interface(will point to any of its sub class implementation) to the server for callback purpose. I tried & getting an exception saying that 'the interface does not have default constructor'. Is there any way or any other alternative ways to do this. Thanks View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4107738#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...