Organizing Your Development Project in Java

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CHAPTER 6 Organizing Your Development Project
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not yet configured, this will show up in the problem markers These errors are normal and will be removed when you fix the preferences and add EJBs to the project
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Figure 615 Project Explorer EJB Project
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The ejbModule folder contains Java and EJB resources such as the deployment descriptor (see Figure 616) Similar to Web application modules, an EJB project has a publisher for EJB applications (see Figure 617) This publisher creates a deployable EJB module from the contents of the project with all the classes and deployment descriptors EJB Client Projects There is another EJB related project type called the EJB Client ProjectThese projects are used to share common classes between EJB modules and their clients such as a Web applicationTypical classes that are found in these modules are the EJB interface types and models EJB project wizards can create an EJB client projectThis option can be selected only when the EJB module is added to an EAR module It is also possible to add the client project to an existing EJB module by using the context menu in the Project Explorer view
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Web Project Types and J2EE Applications
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Project
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EJB Module
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ejbModule
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* META-INF Resource
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* Class
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* ejb-jarxml Resource
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Figure 616 Elements of an EJB Project
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LeaguePlanetEJBProject LeagueBeans ejbModule/ com/ LeagueBeanjava PlayerBeanjava META-INF/ ejb-jarxml module Builders LeagueBeansjar meta-inf/ ejb-jarxml com
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Development View (WTP)
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Runtime View (J2EE Spec)
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Figure 617 EJB Publisher
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CHAPTER 6 Organizing Your Development Project
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This completes the process of creating an EJB project The next section describes how to create an enterprise application project that can combine EJB and Web modules in a J2EE Enterprise Application (EAR) module
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Creating Enterprise Applications
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The most interesting J2EE enterprise applications have more than one module They have several Web applications and EJB modules The J2EE specification provides a basic application packaging structure called an enterprise application Enterprise application archives are packaged as Java archives with the ear suffix Therefore, they are also known as EARs An EAR can contain one or more
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EJB modules Web application modules J2CA resource adapter modules Application client modules
An enterprise application project contains the hierarchy of resources that are required to deploy these modules as a J2EE enterprise application An enterprise application module contains a set of references to the other J2EE modules that are combined to compose an EAR In addition to the modules, an enterprise application module also includes a deployment descriptor, applicationxml Publishers for enterprise application projects consume the output of the publishers from their component modules (see Figure 618) For example, the builder of an EAR that contains a Web application module and an EJB module waits until the builder for the Web and EJB projects creates the deployable structures for these modules, and then it assembles these artifacts in the EAR WTP has wizards and tools to create and edit EARs They are described in the following use cases
Create a New Web or EJB Module in an EAR
When a new J2EE module project is created, such as a dynamic Web project or an EJB project, it can be associated with an enterprise application project (see Figure 619) The project wizards let you specify a new or existing enterprise application You can also choose the project in which you would create the enterprise application module Finally, the EAR is updated to include the new J2EE module in it
Web Project Types and J2EE Applications
LeagueApplicationProject LeagueApplication META-INF/ applicationxml module
ear Builders
LeagueWebProject module Builders
LeagueEJBProject module
Development View (WTP)
jar Builders
Runtime View (J2EE Spec)
Figure 618 EAR Publisher
Adding Existing Web and EJB Modules to an EAR
In the second scenario there are existing J2EE modules, which are to be added to a new enterprise application You create a new EAR project and add your existing modules to it The Enterprise Application wizard creates a new project and allows you to choose the modules to be included in it When you want to create an EAR project, you will typically do the following: 1 Switch to the J2EE perspective In the Project Explorer view, right click, and invoke the New Enterprise Application Project menu item (see Figure 620) 2 Click Next The New Enterprise Application Project wizard opens (see Figure 621) 3 Enter LeaguePlanetEar for the Project name Click the Next button to proceed to the Project Facets selection page