09/02/2013 Professional & Short Term Course
Enterprise JavaBeans are server-side, modular, and reusable components that comprise specific units of functionality.
EJB components come in three varieties, each with its own defined role and life cycle:
Session beans — These may be either stateful or stateless, and are primarily used to encapsulate business logic, carry out tasks on behalf of a client, and act as controllers or managers for other beans.
Entity beans — Entity beans represent persistent objects or business concepts that exist beyond a specific application's lifetime; they are typically stored in a relational database. Entity beans can be developed using bean-managed persistence, which is implemented by the developer, or container-managed persistence, implemented by the container.
Message-driven beans — Message-driven beans listen asynchronously for Java Message Service (JMS) messages from any client or component and are used for loosely coupled, typically batch-type, processing.
Typically, the decision to use local or remote access is affected by:
The type of client — Unless you always expect the client to be a Web component or another bean, choose remote access.
Whether the beans are tightly or loosely coupled — If beans depend on each other and interact frequently, consider local access.
Scalability — Remote access is inherently scalable and should be used if scalability is an important factor.
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