When you create an inside-out Web service, you can expose a session Enterprise Java Bean (EJB), or a pure Java class as a Web service.
You have created the implementation bean, which you want to expose as a Web service.
Expose a session EJB as a Web service.
More information: Creating an Inside-Out Web Service from an Enterprise Java Bean
Expose a Java class as a Web service.
More information: Creating an Inside-Out Web Service from a Java Class
More information
When creating inside-out Web services, you can use a service endpoint interface (SEI) to expose some or all methods of the implementation bean as Web service methods.