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Enterprise Java Application Server (EJAS) technology is a framework for developing and executing Distributed Applications. These Applications provide System - Level Services such as Transaction Management, Security, Client Connectivity and Database Access. Enterprise Java Beans provide a Component Model that will help you to build Business Application with your existing Databases, Applications, Systems, and Infrastructure Management.
Enterprise Java Application Server (EJAS) offers you: Automatic Persistence (Database and File Access), Automatic Declarative Transaction Models, Client Authentication and Access Control at the Method Level, Resource Management for Threads, Network, and Database Connections, Bean Caching, Bean Life-Cycle Management for Creating, Finding, and Destroying Beans, Concurrency Control, External Configuration of Bean Runtime Properties, Dynamic Deployment of Beans in a Running Server.
The Enterprise Java Application Server (EJAS) is `Container’s Container` - it contains the EJB Container. This Server is responsible for providing the container with Lower-Level Services.
EJAS Container: An EJAS Container is an environment in which Enterprise Java Beans executes. Its primary role is to serve as a buffer between an EJB and the outside world. Clients do not directly connect to the EJB Bean itself, rather, they connect to representation of the Bean provided by the Container, which then forwards the Client`s requests to the Bean. The Container controls the Enterprise Beans and provides them with important Systems-Level Services.
The Container provides the following services to Enterprise Bean:
1) Transaction Management.
2) Security.
3) Remote Client Connectivity.
4) Life Cycle Management.
5) Database Connection Pooling. |
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