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Configuring a persistence application involves specifying the bits of information, additional to the code, that the execution environment or persistence platform may require in order for the code to function as a runtime application. Packaging means putting all the pieces together in a way that makes sense and can be correctly interpreted and used by the infrastructure when the application is deployed into an application server or run in a stand-alone JVM. Deployment is the process of getting the application into an execution environment and running it. One could view the mapping metadata as part of the overall configuration of an application, but we won t cover that in this chapter because it has already been discussed in previous chapters. In this chapter, we will be discussing the primary runtime persistence configuration file, persistence.xml, which defines persistence units. We will go into detail about how to specify the different elements of this file, when they are required, and what the values should be. Once the persistence unit has been configured, we will package a persistence unit with a few of the more common deployment units, such as EJB archives, web archives, and the application archives in a Java EE server. The resulting package will then be deployable into a compliant application server. We will also step through the packaging and deployment rules for Java SE applications.

public class FerrariCar implements Car{ //...implementation of methods defined in Car // ...implementation of other methods }

The latest version of Hibernate is always available from http://hibernate.org/ under the lefthand menu named Download. Various older versions and additional libraries are available from the resulting page, but you will need to select Hibernate 3.0.2 or a later version. Download the archive and unpack that to a local directory. For the purpose of our examples, this will be the directory C:\home\hibernate-3.0. The unpacked archive contains all of the source code for Hibernate itself, a Jar library built from this source, and all of the library files that are necessary to run our sample.

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The persistence unit is the primary unit of runtime configuration. It defines the various pieces of information that the provider needs to know in order to manage the persistent classes during program execution and is configured within a persistence.xml file. There may be one or more persistence.xml files in an application, and each persistence.xml file may define multiple persistence units. There will most often be only one, though. Since there is one EntityManagerFactory for each persistence unit, you can think of the configuration of the persistence unit as the configuration of the factory for that persistence unit. A common configuration file goes a long way to standardizing the runtime configuration, and the persistence.xml file offers exactly that. While some providers might still require an additional providerspecific configuration file, most will also support their properties being specified within the properties section (described in the Adding Vendor Properties section) of the persistence.xml file. The persistence.xml file is the first step to configuring a persistence unit. All the information required for the persistence unit should be specified in the persistence.xml file. Once a packaging strategy has been chosen, the persistence.xml file should be placed in the META-INF directory of the chosen archive. Each persistence unit is defined by a persistence-unit element in the persistence.xml file. All the information for that persistence unit is enclosed within that element. The following sections describe the metadata that a persistence unit may define when deploying to a Java EE server.

Every persistence unit must have a name that uniquely identifies it within the scope of its packaging. We will be discussing the different packaging options later, but in general, if a persistence unit is defined within a Java EE module, there must not be any other persistence unit of the same name in that module. For example, if a persistence unit named EmployeeService is defined in an EJB JAR named emp_ejb.jar, there should not be any other persistence units named EmployeeService in emp_ejb.jar. There may be persistence units named EmployeeService in a web module or even in another EJB module within the application, though. We have seen in some of the examples in previous chapters that the name of the persistence unit is just an attribute of the persistence-unit element, as in the following: <persistence-unit name="EmployeeService"/> This empty persistence-unit element is the minimal persistence unit definition. It may be all that is needed if the server defaults the remaining information, but not all servers will do this. Some may require other persistence unit metadata to be present, such as the data source to be accessed.

This pattern also consolidates object creation in only a handful of factory classes, making it easy to maintain. With a factory helper, it is also possible to make object creation configurable. You can define the concrete implementation that you supply in some properties or XML configuration files, making it swappable on the fly.

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