June 2004
Intermediate to advanced
792 pages
23h 17m
English
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Chapter 2. Architectural Overview
In order to use Enterprise JavaBeans effectively, you need to understand the EJB architecture. This chapter explores the core of the EJB architecture: how enterprise beans are distributed as business objects. Chapter 3 explores the services and resource-management techniques supported by EJB.
In order to be truly versatile, the EJB component design had to be smart. For application developers, assembling enterprise beans requires little or no expertise in the complex system-level issues that often plague three-tier development efforts. While EJB makes the process easier for application developers, it also provides EJB server developers with a great deal of flexibility in how they support the EJB specification.
The Enterprise Bean Component
Enterprise JavaBeans server-side components come in three fundamentally different types: entity, session, and message-driven beans. Both session and entity beans are RMI-based server-side components that are accessed using distributed object protocols. Message-driven beans process messages from non-RMI systems like Java Message Service, legacy systems, and web services. All EJB servers must at least support a JMS-based message driven bean, but they may also support other types of message-driven bean.
A good rule of thumb is that entity beans model business concepts that can be expressed as nouns. For example, an entity bean might represent a customer, a piece of equipment, an item in inventory, or even a place. ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.