Common Expenses: Design Pattern

This post should have been one of the first actually.

Here is described the design pattern used on Common Expenses, I’ve used MVC as it is very straight forward: separate data management (model), application login (controller) and presentation (view).

As I post earlier the persisten layer is made with Hibernate, then the Businnes Login is implementend via Stateless EJB.

The application controller is a set of Servlet which get requests, work out them and send the result to the presentation layer.

The presentation layer is implemented with JSP.

Here is a schema of the whole application: