EJB / Enterprise JavaBeans for Not Yet Techies

"Computer Careers: Working With These Application Components for Large Businesses"

by Richard Stooker, President Info Ring Press and author of Secrets of Changing to a Computer Career

EJB / Enterprise JavaBeans is the heart of J2EE / Java 2 Enterprise Edition, which is a complete platform and framework for simplifying the creation of distributed Java software applications for large businesses and other large enterprises. It has component-based architecture -- components are a piece of code implementing a well-defined interface. EJB / Enterprise JavaBeans is a server side component that implements the business logic of a software application.

EJB / Enterprise JavaBeans 1.0 came out from Sun Microsystems in 1998. 2.0 came out in 2001. These components of applications run on servers. One of the most common is BEA WebLogic, and another is JBoss.

They live in a EJB / Enterprise JavaBeans container which is a runtime J2EE environment and which has multiple services to support them

One advantage of them is that they are single threaded - developers do not need to know about the very low level APIs and details. That is handled by the J2EE framework. The technology is designed to work with legacy systems, and is based on RMI / Remote Method Invocation.

EJB / Enterprise JavaBeans encapsulate business logic of an application. They have two interfaces and one class. They have a home and component interface and the bean class.

There are three kinds of EJB / Enterprise JavaBeans: Session, Entity and Message-driven.

Next: Erlang programming language

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