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When these concerns start to appear in the domain model classes, this is an example of leakage of concerns The EJB standard solves the problem of leaky concerns If you implement your domain classes using the entity programming model, the container takes care of some concerns for you (or at least lets you externalize those concerns into metadata, as annotations or XML descriptors) The EJB container prevents leakage of certain crosscutting concerns using interception An EJB is a managed component, executed inside the EJB container; the container intercepts calls to your beans and executes its own functionality This approach allows the container to implement the predefined crosscutting concerns security, concurrency, persistence, transactions, and remoteness in a generic way Unfortunately, the EJB 21 specification imposes many rules and restrictions on how you must implement a domain model.

Figure 6.2 A UML view of the Java archives. WAR and EAR files are subclasses of the JAR file, which is itself a subclass of a Zip file class. WAR files can contain JAR libraries; EAR files can contain JAR and WAR files. JAR files contain a manifest, and usually some compiled class files. Omitted is the fact that Zip and gzipped tar files are often used to distribute JAR, WAR, and EAR files.

This, in itself, is a kind of leakage of concerns in this case, the concerns of the container implementer have leaked! This was addressed in the EJB 30 specification, which is nonintrusive and much closer to the traditional JavaBean programming model Hibernate isn t an application server, and it doesn t try to implement all the crosscutting concerns of the full EJB specification Hibernate is a solution for just one of these concerns: persistence If you require declarative security and transaction management, you should access entity instances via a session bean, taking advantage of the EJB container s implementation of these concerns Hibernate in.

an EJB container either replaces (EJB 2.1, entity beans with CMP) or implements (EJB 3.0, Java Persistence entities) the persistence aspect. Hibernate persistent classes and the EJB 3.0 entity programming model offer transparent persistence. Hibernate and Java Persistence also provide automatic persistence. Let s explore both terms in more detail and find an accurate definition.

The Ant tasks that provide the packaging services all have a class hierarchy similar to the archive class model (see figure 6.3).

We use transparent to mean a complete separation of concerns between the persistent classes of the domain model and the persistence logic, where the persistent classes are unaware of and have no dependency on the persistence mechanism. We use automatic to refer to a persistence solution that relieves you of handling low-level mechanical details, such as writing most SQL statements and working with the JDBC API. The Item class, for example, doesn t have any code-level dependency on any Hibernate API. Furthermore:

Figure 6.3 A UML view of the archive tasks. The classes corresponding to the zip, jar, war and ear tasks exactly mirror the inheritance model of the file formats. The four classes at the top of the tree are implementation classes, and are not directly creatable in a build file. Expand is the exception; you can create a task <expand> and it does everything <unzip> does, though it will complain that you should use <unzip> instead

Hibernate doesn t require that any special superclasses or interfaces be inherited or implemented by persistent classes. Nor are any special classes used to implement properties or associations. (Of course, the option to use both techniques is always there.) Transparent persistence improves code readability and maintenance, as you ll soon see. Persistent classes can be reused outside the context of persistence, in unit tests or in the user interface (UI) tier, for example. Testability is a basic requirement for applications with rich domain models. In a system with transparent persistence, objects aren t aware of the underlying data store; they need not even be aware that they are being persisted or retrieved. Persistence concerns are externalized to a generic persistence manager interface in the case of Hibernate, the Session and Query. In JPA, the EntityManager and Query (which has the same name, but a different package and slightly different API) play the same roles.

JAR files A normal JAR file stores classes in a simple tree, resembling a package hierarchy, with any metadata added to the META-INF directory. This directory should contain at least the manifest file MANIFEST.MF, which describes the JAR file to the classloader. Creating a JAR file We have been generating JAR files since chapter 2 with the <jar> task. At its simplest, it compiles an entire tree of files, usually the output of the build.

Transparent persistence fosters a degree of portability; without special interfaces, the persistent classes are decoupled from any particular persistence solution. Our business logic is fully reusable in any other application context. You could easily change to another transparent persistence mechanism. Because JPA follows the same basic principles, there is no difference between Hibernate persistent classes and JPA entity classes.