Getting Started with WebSphere Application Server

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98 Getting Started with WebSphere Application Server Community Edition You can create JPA entities within an EJB project, so that JPA entities can be included in an EJB jar package. To successfully deploy JPA entities, you need to provide another configuration file named persistence.xml. This file is located in META-INF, together with openejb-jar.xml. In Community Edition, you have to specify some parameters in this file so that Community Edition can find your entities. Listing 5.10 provides an example of the persistence.xml template. JPA provider class name Description information here JNDI name of Data source Jar file name of persistence unit persistence class
Chapter 5 – Enterprise Java Beans 99 In this step, a JPA project is created with eclipse. The JPA project often contains several entities generated from the database. To make use of the JPA entities, other projects such as Web projects, and EJB projects often depend on JPA projects. The referenced JPA project will be deployed with the Web project or EJB project together in Community Edition. 3. Create a database connection in Eclipse Since the database pool has been created in the Community Edition server, a connection is needed in Eclipse. With this database connection, the data management plug-in can get database information to prepare for the generation of JPA entities. 4. Generate JPA entities JPA can map Java classes to database entities. Once the tables in the database have been defined, several JPA entities can be generated directly from these tables. In that way, both EJB project and Web project can make use of the generated entities. An example using JPAs is provided in the Exercises section of this chapter. 5.5 Summary This chapter discussed EJB 3.0 related topics with Community Edition, including EJB 3.0 development, application client development and JPA entities application in Community Edition. 5.6 Exercises In this exercise you will develop an EJB, JPA and a servlet to calculate university credits of students. You will use Eclipse with the WEP installed and DB2 Express-C 9.7. Credits of all the students will be shown using a servlet. Note: The exercise complete code and solutions are provided in the zip file gettingStartedWithWasceEdition1st_src.zip accompanying this book. Follow these steps: 1. Create a database and a table in DB2 Express-C 9.7 Follow the steps introduced in Chapter 4.2.1 – Creating a database, to create a database called Studntdb as shown in Figure 5.3.
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G E T T I N G S T A R T E D W I T H
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Notices This information was develo
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Trademarks IBM, the IBM logo, and i
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3.8 Exercises .....................
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9.3.2 Changing port numbers .......
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13 Preface Keeping your skills curr
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The DB2 on Campus book series 15
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18 Getting Started with WebSphere A
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1 Chapter 1 - Introduction to WebSp
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Introduction to WebSphere Applicati
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PART III - ADMINISTERING COMMUNITY
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10 Chapter 10 - Tuning a Community
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A Appendix A - Solutions to review
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B Appendix B - Up and running with
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Appendix B - Up and running with DB
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C Appendix C - Using the sample cod
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