Hi Sir, in my classes i have a manytomany relationshipm between 2 entities (Student and course) so should i create an interface "Studentcourse" that contain the definition of functions , a class "StudentcourseUniBean" that implements this interface and also all functions and a client class " StudentcourseClient" that contain the main. Or I can put this functions in one interface finally i'll have only one client. one interface and one class. and this interface contain all function that can i do for all entities(addStudentt(),deleteCourse(),addCourse()....) or for each relationship and entity I have to create interface(contain functions ) ,class(implement the interface ),client(main class).Thank you for your help Best Regards View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4270128#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...