Chapter 17. J2EE
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, J2EE outlines how these technologies work together to provide a complete solution for developing applications. 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. First, the JNDI enviroment naming
context (ENC) is used to standardize the way components
look up resources they need. We discussed 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—is 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 model that can be implemented by web server vendors. ...
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