February 2004
Intermediate to advanced
848 pages
27h 25m
English
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Chapter 10. Using EJBs
Enterprise JavaBeans (EJBs) are reusable server-side Java components that encapsulate the business logic of a distributed application. All EJBs are created and managed at runtime by an EJB container, which provides essential system-level services such as support for transactions, security, persistence, and concurrency. WebLogic mediates all client invocations to the enterprise bean through the EJB container.
In this chapter, you will learn about building, deploying, and optimizing EJBs within WebLogic. To do this, you also will see how the XML deployment descriptors help configure the various services provided by the EJB container. In fact, the XML descriptors provide vital information on assembly and deployment, and also determine how the container manages the EJB instances at runtime. The standard XML descriptor contains information on deployment, the abstract schema model, security restrictions, and transaction settings for the EJB component. The WebLogic-specific deployment descriptors allow you to configure the main topics covered by this chapter — namely pooling, EJB concurrency, automatic EJB persistence, transaction, failover and clustering behavior, and life-cycle optimizations.
Any EJB implementation requires several Java classes and a number of XML descriptor files. Creating, synchronizing, and maintaining these configuration settings have traditionally been quite a burden on the developer. WebLogic provides several tools to remove this hardship. ...
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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.