By Eric Jendrock
The Java EE 6 instructional complicated subject matters, Fourth variation, is a task-oriented, example-driven advisor to constructing firm purposes for the Java Platform, firm version 6 (Java EE 6). Written by way of individuals of the Java EE 6 documentation staff at Oracle, this e-book offers new and intermediate Java programmers with a deep figuring out of the platform.
This guide–which builds at the recommendations brought within the Java EE 6 instructional uncomplicated strategies, Fourth Edition–contains complicated fabric, together with particular introductions to extra complicated platform gains and directions for utilizing the most recent model of the NetBeans IDE and the GlassFish Server, Open resource variation.
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Extra resources for The Java EE 6 Tutorial Advanced Topics
Ear extension. Using JAR, WAR, and EAR files and modules makes it possible to assemble a number of different Java EE applications using some of the same components. No extra coding is needed; it is only a matter of assembling (or packaging) various Java EE modules into Java EE JAR, WAR, or EAR files. An EAR file (see Figure 1舑6) contains Java EE modules and, optionally, deployment descriptors. xml extension, describes the deployment settings of an application, a module, or a component. Because deployment descriptor information is declarative, it can be changed without the need to modify the source code.
Enterprise JavaBeans (EJB) components (enterprise beans) are business components that run on the server. Java EE components are written in the Java programming language and are compiled in the same way as any program in the language. The differences between Java EE components and 舠standard舡 Java classes are that Java EE components are assembled into a Java EE application, they are verified to be well formed and in compliance with the Java EE specification, and they are deployed to production, where they are run and managed by the Java EE server.
Because deployment descriptor information is declarative, it can be changed without the need to modify the source code. At runtime, the Java EE server reads the deployment descriptor and acts upon the application, module, or component accordingly. FIGURE 1舑6. EAR File Structure The two types of deployment descriptors are Java EE and runtime. A Java EE deployment descriptor is defined by a Java EE specification and can be used to configure deployment settings on any Java EE-compliant implementation.