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Introduction to Java Enterprise Edition [ Tutorial ] |
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Written by sunil boricha
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Page 1 of 4
This tutorial provides an overview of
Java Enterprise Edition. It helps understand Multi-tired Architecture,
J2EE API and types of Enterprise Java Beans.
Learning Objectives:
After completing this tutorial, you will be able to:
- Understand Multi-tired Architecture
- Know about J2EE API
- Understand about types of EJBs
Introduction
J2EE stands for Java 2 Enterprise Edition. It is a specification
provided by Sun Microsystems for server side development in Java that
is deployable in distributed environments.
One unified specification of J2EE has helped to create applications
that are vendor independent. There are several application servers
currently available in the market on which a server side Java
application can run. IBM Websphere, BEA Weblogic, Sun Java System
Application Server, Oracle 9i etc are most common examples. All these
servers are J2EE compliant servers as the vendors for these servers
(IBM, BEA, Sun, Oracle) have made the servers as J2EE compatible. Due
to this, an application developed with J2EE compliance ad running on
one server can run on another server that supports J2EE, without any
change (at least in theory).
J2EE also facilitates component-based development. It gives different
technologies to develop the components at different layers. A JSP (Java
Server Pages) developer can create the web pages. A business component
developer can create EJBs. An application server vendor can create a
J2EE engine that takes cares of factors like performance, transaction,
multithreading etc. Each of these roles can execute their job without
being concerned about how the other role has implemented its component.
For example, a JSP developer need not know how an EJB developer is
retrieving data and processing it. Similarly an EJB developer need not
know how the JSP developer is going to display the data or how the
application server vendor is managing the integrity of the transaction
of the EJBs that he created.
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