June 2004
Intermediate to advanced
792 pages
23h 17m
English
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Component Models
The term
"component model” has
many different interpretations. Enterprise JavaBeans specifies a
server-side
component model. Using a set of classes and interfaces from the
javax.ejb package, developers can create,
assemble, and deploy components that conform to the EJB
specification.
The original JavaBeans is also a component model, but it’s not a server-side component model like EJB. Other than sharing the name “JavaBeans,” these two component models are completely unrelated. In the past, a lot of the literature referred to EJB as an extension of the original JavaBeans, but this is a misrepresentation. The two APIs serve very different purposes, and EJB does not extend or use the original JavaBeans component model.
JavaBeans is intended to be used for intraprocess purposes, while EJB is designed for inter process components. In other words, the original JavaBeans was not intended for distributed components. JavaBeans can be used to solve a variety of problems, but it is primarily used to build clients by assembling visual (GUI) and nonvisual widgets. It’s an excellent component model, possibly the best one ever devised for intraprocess development, but it’s not a server-side component model. EJB, on the other hand, is explicitly designed to address issues involved with managing distributed business objects in a three-tier architecture.
Given that JavaBeans and Enterprise JavaBeans are completely different, why are they both called component models? In this context, ...
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.