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Many of the persistence unit elements in the persistence.xml file apply to persistence units that are deployed within the Java EE container. The only ones that we need to specify for our example are name, transaction-type, class, and properties. There are a number of other elements that can be specified in the persistence unit configuration in the persistence.xml file, but they will be discussed in more detail in 13. Listing 2-11 shows the relevant part of the persistence.xml file for this example. Listing 2-11. Elements in the persistence.xml File <persistence> <persistence-unit name="EmployeeService" transaction-type="RESOURCE_LOCAL"> <class>examples.model.Employee</class> <properties> <property name="javax.persistence.jdbc.driver" value="org.apache.derby.jdbc.ClientDriver"/> <property name="javax.persistence.jdbc.url" value="jdbc:derby://localhost:1527/EmpServDB;create=true"/> <property name="javax.persistence.jdbc.user" value="APP"/> <property name="javax.persistence.jdbc.password" value="APP"/> </properties> </persistence-unit> </persistence> The name attribute of the persistence-unit element indicates the name of our persistence unit and is the string that we specify when we create the EntityManagerFactory. We have used EmployeeService as the name. The transaction-type attribute indicates that our persistence unit uses resource-level EntityTransaction instead of JTA transactions. The class element lists the entity that is part of the persistence unit. Multiple class elements can be specified when there is more than one entity. They would not normally be needed when deploying in a Java EE container because the container will scan for entities automatically as part of the deployment process, but they are needed for portable execution when running in Java SE. We have only a single Employee entity. The last section is just a list of properties that can be standard or vendor-specific. The JDBC database login parameters must be specified when running in a Java SE environment to tell the provider what resource to connect to. Other provider properties, such as logging options, are vendorspecific and might also be useful.

TIP The names of the four JDBC properties (javax.persistence.jdbc.*) were standardized in JPA 2.0. Previous to that, a provider chose its own property names and documented what users needed to specify in order to connect to a JDBC data source.

The Hibernate session factory creates Session objects for a database connection and manages connection data, caching, and mappings behind the scenes. After you create and populate a

public class FormulaOneDriver{ public Car getCar(){ Car car = new FerrariCar(); return car; } }

The persistence artifacts are packaged in what we will loosely call a persistence archive. This is really just a JAR-formatted file that contains the persistence.xml file in the META-INF directory and normally the entity class files.

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Because we are running as a simple Java SE application, all we have to do is put the application JAR, the persistence provider JARs, and the JPA JAR on the classpath when the program is executed.

The Formula 1 driver object (FormulaOneDriver) needs a car to drive. Hence, it creates an instance of the Car object directly and uses it. Direct instantiation increases coupling and scatters object creation code across the application, making it hard to maintain and unit test.

Summary

Configuration object, you will need to build a session factory from the Configuration. Your application is responsible for managing the session factory. You should only have one session factory, unless you are using Hibernate to connect to two or more databases with different settings, in which case you would have one session factory for each database. To maintain backwards compatibility with Hibernate 2, the Hibernate 3 session factory creates org.hibernate.classic.Session session objects. The classic session objects implement all of the Hibernate 3 session functionality, in addition to the deprecated Hibernate 2 session methods. We cover the changes in core functionality between Hibernate 2 and 3 in 14. Obtain a session from the SessionFactory object with one of the openSession() methods. There are four openSession() methods (see Listing 2-2). The no-argument openSession() method opens a session with the database connection and interceptor specified in the SessionFactory s original configuration. You can pass a JDBC connection, a Hibernate interceptor, or both as arguments to the other openSession() methods. Listing 2-2. openSession() Methods public org.hibernate.classic.Session public org.hibernate.classic.Session throws HibernateException public org.hibernate.classic.Session Interceptor interceptor) public org.hibernate.classic.Session openSession() throws HibernateException openSession(Interceptor interceptor) openSession(Connection connection, openSession() throws HibernateException

This chapter discussed just enough of the basics of the Java Persistence API to develop and run a simple application in a Java SE runtime. We started out discussing the entity, how to define one, and how to turn an existing Java class into one. We discussed entity managers and how they are obtained and constructed in the Java SE environment. The next step was to instantiate an entity instance and use the entity manager to persist it in the database. After we inserted some new entities, we could retrieve them again and then remove them. We also made some updates and ensured that the changes were written back to the database. We talked about the resource-local transaction API and how to use it. We then went over some of the different types of queries and how to define and execute them. Finally, we aggregated all these techniques and combined them into a simple application that we can execute in isolation from an enterprise environment. In the next chapter, we will look at the impact of the Java EE environment when developing enterprise applications using the Java Persistence API.

Factory Helper The factory helper is a common and widely used dependency injection strategy. It is based on the GOF factory method design pattern. The factory method consolidates the use of the new operator and supplies appropriate object instances based on some input. This is shown in Listing 2-2.

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