Iteration 1: The Domain Model in Java

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Iteration 1: The Domain Model
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In Iteration 1, you build the model, service, and data objects as POJOs You also use Java Utility projects and define J2EE module dependencies In Iteration 2, you use EJBs You use stateless session beans to provide remote interfaces for services You develop EJBs using XDoclet annotations, and run and debug EJBs on servers To test your EJBs, you use a simple Web application You use an enterprise application to organize and share common components In Iteration 3, you implement reliable, asynchronous calls using messagedriven beans (MDB)
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Iteration 1: The Domain Model
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You will start building a domain model for League Planet using POJOs The model has objects such as leagues, teams, and players The presentation tier sends messages to these objects via the service layer and displays the results The service layer captures application logic and flow, such as requests for scheduling games or resolving schedule conflicts with the aid of an administrator External systems, like the local news Web site, can use the service layer and Web services to get information about the games Obviously, the domain model is a core layer of the complete application The presentation layer and service consumers need to access it The classes in the business tier can be referenced by Web modules, EJB modules, and Web services The persistence tier uses the domain model to populate lists as responses to queries or to save information to a database As you can see, the domain model must be carefully designed so that it can be used in many parts of the overall application
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J2EE Utility Projects
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WTP provides J2EE Utility Projects for the development of Java libraries that can be shared between modules Utility projects behave much like plain Java projects, but they know about J2EE modules Refer to 6 to learn more about creating utility projects The contents of a utility project can be packaged as a JAR Other J2EE projects Web, EJB, and EAR modules, for example can refer to utility projects, and WTP automatically packages the utility project with these modules so that it is available at runtime For these reasons, you will use a utility project to hold the domain model Create a utility project as follows:
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CHAPTER 8 The Business Logic Tier
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1 Launch Eclipse, and invoke the File New New Project wizard (see Figure 82)
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Project command to open the
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New Project Wizard
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2 Open the J2EE category, select the Utility Project item, and click the Next button to open the New Utility Project wizard (see Figure 83) 3 The first page of the wizard lets you specify the project name and target runtime Enter the name LeaguePlanetModel for the project name You can also set the target runtime for a utility project This is only meaningful if you refer to classes, such as
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that are provided by a server runtime environment Your business tier will be independent of a server runtime environment, so your choice of a
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Iteration 1: The Domain Model
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runtime is irrelevant Choose a default runtime environment, and click the Next button to proceed to the Select Project Facets page (see Figure 84)
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New Utility Project Project Name
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4 The second page of the wizard lets you specify the project facets The wizard will configure your project according to the facets you select For example, if there was a Spring Beans facet, the wizard would add libraries for the Spring application framework to your project Simply accept the default facets Make sure that Java and Utility Module are checked Click the Finish button to create the new project
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CHAPTER 8 The Business Logic Tier
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Figure 84 New Java Utility Project Facets
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5 Utility projects are normally associated with the J2EE perspective even though they do not contain J2EE resources The wizard will prompt you to switch to the J2EE perspective after it creates the project Click the OK button to switch to the J2EE perspective
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