Hello, I'm publishing a session bean a WebService and it works just fine. The problem is that some methods returns or receives instances of an EntityBean. The problem arises when I add some mapped relations that involve such a bean. In my "Hello World" example I'm using the WS to retrieve, create and modify UserBean (login / password). WHen I add a many2one relation "friend" that maps users to users WebService stop working. any idea if there is any limitation on the type of WS parameters? thanks Mario View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3981563#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...