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In a Java EE environment, you can configure the JPA engine in a Java EE container. But in a Java SE application, you have to set up the engine locally. The configuration of JPA is through the central XML file persistence.xml, located in the META-INF directory of the classpath root. In this file, you can set any vendor-specific properties for the underlying engine configuration. Now let s create the JPA configuration file persistence.xml in the META-INF directory of the classpath root. Each JPA configuration file contains one or more <persistence-unit> elements. A persistence unit defines a set of persistent classes and how they should be persisted. Each persistence unit requires a name for identification. Here, you assign the name course to this persistence unit. <persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0"> <persistence-unit name="course"> <properties> <property name="hibernate.ejb.cfgfile" value="/hibernate.cfg.xml" /> </properties> </persistence-unit> </persistence> In this JPA configuration file, you configure Hibernate as your underlying JPA engine by referring to the Hibernate configuration file located in the classpath root. However, because Hibernate EntityManager will automatically detect XML mapping files and JPA annotations as mapping metadata, you have no need to specify them explicitly. Otherwise, you will encounter an org.hibernate.DuplicateMappingException. Pick a strategy_annotations or XML_and stay with it. You don t need to maintain both. <hibernate-configuration> <session-factory> ... <!-- Don't need to specify mapping files and annotated classes --> <!-<mapping resource="com/apress/springenterpriserecipes/course/ Course.hbm.xml" /> <mapping class="com.apress.springenterpriserecipes.course.Course" /> --> </session-factory> </hibernate-configuration> As an alternative to referring to the Hibernate configuration file, you can also centralize all the Hibernate configurations in persistence.xml. <persistence ...> <persistence-unit name="course"> <properties> <property name="hibernate.connection.driver_class" value="org.apache.derby.jdbc.ClientDriver" /> <property name="hibernate.connection.url" value="jdbc:derby://localhost:1527/course;create=true" /> <property name="hibernate.connection.username" value="app" /> <property name="hibernate.connection.password" value="app" />

return postageService.calculatePostage(country, weight); } catch (NamingException e) { ... } catch (RemoteException e) { ... } catch (CreateException e) { ... } } } In this method, you first initialize the JNDI lookup context by providing a context factory class and a provider URL. These parameters are EJB container specific, and the preceding values are defaults for OpenEJB. Then you look up the remote home interface from the JNDI context and retrieve a remote EJB reference from it. Up to now, you can invoke the method on the remote EJB component. In the entire process, you also have to handle NamingException, CreateException, and RemoteException. As a result, you need many lines of code to invoke a single method on the EJB component. Now you should declare this bean in the front desk subsystem s bean configuration file (such as beans-front.xml in the classpath root). <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd"> <bean id="frontDesk" class="com.apress.springrecipes.post.FrontDeskImpl" /> </beans> Then you can test the postage calculation function with the following FrontDeskMain class for the front desk subsystem: package com.apress.springrecipes.post; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class FrontDeskMain { public static void main(String[] args) { ApplicationContext context = new ClassPathXmlApplicationContext("beans-front.xml"); FrontDesk frontDesk = (FrontDesk) context.getBean("frontDesk"); double postage = frontDesk.calculatePostage("US", 1.5); System.out.println(postage); } }

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<property name="hibernate.dialect" value="org.hibernate.dialect.DerbyDialect" /> <property name="hibernate.show_sql" value="true" /> <property name="hibernate.hbm2ddl.auto" value="update" /> </properties> </persistence-unit> </persistence>' In a Java EE environment, a Java EE container is able to manage the entity manager for you and inject it into your EJB components directly. But when you use JPA outside of a Java EE container (e.g., in a Java SE application), you have to create and maintain the entity manager by yourself. Now let s implement the CourseDao interface in the jpa subpackage using JPA in a Java SE application. Before you call JPA for object persistence, you have to initialize an entity manager factory. The purpose of an entity manager factory is to produce entity managers for you to persist your objects.

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