EJB defines the callBack interfaces a Java Bean must expose to its OTM, and viceversa. In addition. EJB specifies a packaging mechanism for server-side components. The EJB specification defines a server component model for Java Beans. An EJB is specialized non-visual Java Bean that runs on a server like Java Beans. EJB can be assembled via tools to create new application. In a multitier application architecture, most of an application logic is moved from the client to one or more server.

A server component model simplifies the process of moving the logic to the server. The component model implements a set of automatic services to manage the components.

EJB provides the following frame work support.

1. Distributed object infra structure.
2. Component packing add employment.
3. Declarative transaction management.
4. Factory support.
5. Bean activation and passivation.
6. Container metadata.
7. Security.

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