About J2EE Design Patterns

The J2EE design patterns pioneered by Sun Microsystems are a set of best practices for solving recurring design problems. Patterns are ready-made solutions that can be adapted to different problems, and leverage the experience of successful J2EE developers.

JDeveloper can help you implement the following J2EE design patterns in your EJB applications:

MVC - The MVC pattern divides an application into three parts, the Model, View, and Controller. The model represents the business services of the application, the view is the portion of the application that the client accesses, the controller controls the flows and actions of the application and provides seamless interaction between the model and view. The MVC pattern is automatically implemented if you choose a Web Application template in your workspace.
Session Facade - The session facade pattern contains and centralizes complex interactions between lower-level EJBs (often entity beans). It provides a single interface for the business services of your application. To create a session facade, see Implementing the Session Facade Pattern.
Data Transfer Object - The data transfer object (DTO) design pattern provides better maintainability by separating usecases from the object model, allows for reuse of entity beans across different applications, and increases performance when the attributes from multiple entity beans can be passed to the client with a single call. For more information, see Generating Data Transfer Objects.