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Hibernate also supports the use of JPA annotations to define mapping metadata, so there are essentially three different strategies for mapping and persisting your objects with Hibernate and JPA: Using the Hibernate API to persist objects with Hibernate XML mappings Using the Hibernate API to persist objects with JPA annotations Using JPA to persist objects with JPA annotations void store(Course course); void delete(Long courseId); Course findById(Long courseId); List<Course> findAll();.

your OpenEJB installation directory. Then execute the OpenEJB startup script (located in the bin directory) with the parameter start. To deploy an EJB component, you also execute the OpenEJB startup script, but this time you pass deploy and the location of your EJB JAR file as parameters.

The core programming elements of Hibernate, JPA, and other ORM frameworks resemble those of JDBC. They are summarized in Table 3-3. Table 3-3. Core Programming Elements for Different Data Access Strategies

It ensures that each layer works well with the others There s no big bang integration phase at the end, where you try to pull all the pieces together but find that they don t quite fit..

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For OpenEJB, the default JNDI name for a remote home interface of an EJB 2.x component is the EJB name with RemoteHome as its suffix (PostageServiceRemoteHome in this case). If the deployment is successful, you should see the following output: C:\openejb-3.0\bin>openejb deploy c:\PostageService.jar Application deployed successfully at "c:\PostageService.jar" App(id=c:\PostageService.jar) EjbJar(id=PostageService.jar, path=c:\PostageService.jar) Ejb(ejb-name=PostageService, id=PostageService) Jndi(name=PostageServiceRemoteHome) Jndi(name=PostageServiceLocal)

In Hibernate, the core interface for object persistence is Session, whose instances can be obtained from a SessionFactory instance. In JPA, the corresponding interface is EntityManager, whose instances can be obtained from an EntityManagerFactory instance. The exceptions thrown by Hibernate are of type HibernateException, while those thrown by JPA may be of type PersistenceException or other Java SE exceptions like IllegalArgumentException and IllegalStateException. Note that all these exceptions are subclasses of RuntimeException, which you are not forced to catch and handle.

Creating EJB 2.x Components with Spring s Support As you can see, your EJB implementation class needs to implement all EJB life cycle methods even if you don t need them. Actually, it can extend Spring s EJB support class to get the life cycle methods implemented by default. The support class for stateless session beans is AbstractStatelessSessionBean.

s Note To use Spring s EJB support for your EJB implementation classes, you have to include spring.jar

To map entity classes with Hibernate XML mappings, you can provide a single mapping file for each class or a large file for several classes. Practically, you should define one for each class by joining the class name with .hbm.xml as the file extension for ease of maintenance. The middle extension hbm stands for Hibernate metadata. The mapping file for the Course class should be named Course.hbm.xml and put in the same package as the entity class. <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping package="com.apress.springenterpriserecipes.course"> <class name="Course" table="COURSE"> <id name="id" type="long" column="ID"> <generator class="identity" /> </id> <property name="title" type="string"> <column name="TITLE" length="100" not-null="true" /> </property> <property name="beginDate" type="date" column="BEGIN_DATE" /> <property name="endDate" type="date" column="END_DATE" /> <property name="fee" type="int" column="FEE" /> </class> </hibernate-mapping>

(located in the dist directory of the Spring installation) and commons-logging.jar (located in lib/ jakarta-commons) in the classpath of your EJB container. For OpenEJB, you can copy these JAR files to the lib directory of the OpenEJB home. If your OpenEJB container is running, you will have to restart it.

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