The Development And Application Of EJB In Rose Framwork

The Java 2 Platform, Enterprise Edition (J2EE) defines the standard for developing multitier enterprise applications. The J2EE platform simplifies enterprise applications by basing them on standardized, modular components, by providing a complete set of services to those components, and by handling many details of application behavior automatically, without complex programming. The core of the J2EE is EJB - Enterprise Java Bean which is the Enterprise Application component. The EJB Design Patterns is very important for the whole system. And whether the EJB design patterns is better or not impact the efficiency and performance, expansibility, maintainability, reusability of the application directly.A pattern as a best practice solution to a common recurring problem . That is ,a pattern documents and explains an important or challenging problem that can occur when designing or implementing an application , and then dicusses a best practice solution to that problem . Of course there are many uses of patterns . In order to design the pattern of EJB better, we use a new framework - ROSE which stands for Reusable Object-oriented Software Environment. It is a common foundation framework developed in HIT for building applications based on Java and the J2EE platform. With ROSE, the development cycle can be significantly shortened and the application behavior can be far more consistent, there are many criterion of technology in Rose such as : GUI API, Exception API, EJB , JMS , JavaMail , ect .This document mainly aims to introduce four EJB design pattern : Session Facade Pattern .Command Pattern .Version Lock Pattern , Data Object Pattern . And two data handling :Data Conversion and Data Buffer. These patterns can reduce the workload of development for developers and make them focus on the business logic. At the same time .These patterns also improve the efficiency and performance of the application.