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Enterprise Java Application Server
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Version
2.1
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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