Beginning Java EE 6 with GlassFish 3, Second Edition

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CHAPTER 2 ■ JAVA PERSISTENCE■ Note Listings 2-5 and 2-8 show a subset of the elements allowed in a persistence.xml file (persistenceunit,provider, class, properties...). Others elements can be used and are defined in chapter 8 of the JPA 2.0specification. Note that, in the properties element, the ones named javax.persistence are standard andportable across implementations. The ones named eclipselink (such as the logging level for instance) arespecific to EclipseLink.Compiling with MavenYou have all the ingredients to run the application: the Book entity that you need to persist, the Mainclass, which does so using an entity manager, and the persistence unit binding the entity to the Derbydatabase. To compile this code, instead of using the javac compiler command directly, you will useMaven. You first must create a pom.xml file that describes the project and its dependencies such as theJPA API. You also need to inform Maven that you are using Java SE 6 by configuring the maven-compilerpluginas shown in Listing 2-6.Listing 2-6. Maven pom.xml File to Compile, Build, Execute, and Test the Application4.0.0com.apress.javaee6chapter022.0chapter02org.eclipse.persistencejavax.persistence2.0.0org.eclipse.persistenceeclipselink2.0.0org.apache.derbyderbyclient10.6.1.054
CHAPTER 2 ■ JAVA PERSISTENCEorg.apache.derbyderby10.6.1.0testjunitjunit4.8.1testorg.apache.maven.pluginsmaven-compiler-plugintrue1.61.6First, to be able to compile the code, you need the JPA API that defines all the annotations andclasses that are in the javax.persistence package. You will get these classes in a jar referred by thejavax.persistence artifact ID and stored in the Maven repository. The EclipseLink runtime (i.e., thepersistence provider) is defined in the eclipselink artifact ID. You then need the JDBC drivers toconnect to Derby. The derbyclient artifact ID refers to the jar that contains the JDBC driver to connectto Derby running in server mode (the database runs in a separate process and listens to a port) and thederby artifact ID contains the classes to use Derby as an embedded database. Note that this artifact ID isscoped for testing (test) and has a dependency on JUnit 4.To compile the classes, open a command-line interpreter in the root directory that contains thepom.xml file and enter the following Maven command:mvn compileYou should see the BUILD SUCCESSFUL message informing you that the compilation was successful.Maven creates a target subdirectory with all the class files as well as the persistence.xml file.55
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The EXPERT’s VOIce ® in Java tm
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Beginning Java EE 6 Platform with G
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Contents at a Glance■Foreword ...
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■ CONTENTSSummary ...............
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■ CONTENTSBulk Update ...........
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■ CONTENTSStateful . ............
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■ CONTENTSScripting Elements ....
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■ CONTENTSMDB Model .............
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■ CONTENTSFrom the Web to Web Ser
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About the Author■ Antonio Goncalv
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AcknowledgmentsWriting a book about
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■ PREFACECONTENTSChapter 1 briefl
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C H A P T E R 1■ ■ ■Java EE 6
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CHAPTER 3 ■ OBJECT-RELATIONAL MAP
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C H A P T E R 4■ ■ ■Managing
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CHAPTER 4 ■ MANAGING PERSISTENT O
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C H A P T E R 5■ ■ ■Callbacks
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CHAPTER 5 ■ CALLBACKS AND LISTENE
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CHAPTER 6 ■ ENTERPRISE JAVA BEANS
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C H A P T E R 7■ ■ ■Session B
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C H A P T E R 8■ ■ ■Callbacks
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CHAPTER 8 ■ CALLBACKS AND INTERCE
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C H A P T E R 9■ ■ ■Transacti
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CHAPTER 9 ■ TRANSACTIONS AND SECU
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CHAPTER 10 ■ JAVASERVER FACESUnde
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CHAPTER 10 ■ JAVASERVER FACESorg.
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C H A P T E R 11■ ■ ■Pages an
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CHAPTER 11 ■ PAGES AND COMPONENTS
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CHAPTER 12 ■ PROCESSING AND NAVIG
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CHAPTER 15 ■ RESTFUL WEB SERVICES
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■ INDEXApache Maven. See Mavenapp
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■ INDEXDerby, 31-32installing, 32
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Beginning Java EE 6 with GlassFish 3, Second Edition

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