September 2001
Intermediate to advanced
592 pages
18h 22m
English
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Chapter 17. Java 2, Enterprise Edition
The specification for the Java 2, Enterprise Edition ( J2EE) defines a platform for developing web-enabled applications that includes Enterprise JavaBeans, servlets, and JavaServer Pages ( JSP). J2EE products are application servers that provide a complete implementation of the EJB, servlet, and JSP technologies. In addition, the J2EE outlines how these technologies work together to provide a complete solution. To help you understand J2EE, we must introduce servlets and JSP and explain the synergy between these technologies and Enterprise JavaBeans.
At the risk of spoiling the story, J2EE provides two kinds of “glue” to make it easier for components to interact. We have already seen both types of glue. First, the JNDI enterprise naming context (ENC) is used to standardize the way components look up resources they need. We have already seen the ENC in the context of enterprise beans; in this chapter, we will look briefly at how servlets, JSPs, and even some clients can use the ENC to find resources. Second, the use of deployment descriptors—in particular, the use of XML to define a language for deployment descriptors—has been extended to servlets and JSP. Java servlets and JSP pages can be packaged with deployment descriptors that define their relationships to their environment. Deployment descriptors are also used to define entire assemblies of many components into applications.
Servlets
The servlet specification defines a server-side component ...
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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.