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Using super interfaces is an excellent way to ensure that all your EJBs at least attempt to provide an implementation for a common method. By supplying the base interface, implementing EJBs are required to provide at least a trivial implementation of the methods (of the base interface) in order to compile. With each EJB interface inheriting a common super interface, EJB clients assume that EJBs will contain the common methods. In fact, with the super interface in place, your clients can make use of casting techniques to provide greater flexibility and perhaps create longer-lived code through more object-oriented coding practices.

@Target({METHOD}) @Retention(RUNTIME) public @interface PreUpdate {}

javax.persistence.PostUpdate Marks a method in the entity or listener class as a postupdate callback (executed after entity data is updated in the database).

2.1 Generating home, remote, local, and local home interfaces 2.4 Creating value objects for your entity beans 3.17 Decreasing the number of calls to an entity bean 4.1 Retrieving an environment variable 4.4 Reducing the clutter of unimplemented bean methods

Its principal functions are as follows: To ensure that the client is independent from the business model (the latter being subject to modifications over time) To allow access to the data via objects without shared states that can be managed and optimized automatically by the application server Since the problem of state synchronization is avoided, the server itself constructs pools of session objects according to the different sessions opened by the clients To create a functional interface to adding extra nonfunctional properties declaratively using deployment descriptors, as we will explain later To provide remote access to identified services via the J2EE lookup and communication layers (Java Naming and Directory Interface, or JNDI, and Remote Method Invocation, or RMI) This access is also configured in the deployment descriptors.

@Target({METHOD}) @Retention(RUNTIME) public @interface PostUpdate {}

javax.persistence.PreRemove Marks a method in the entity or listener class as a preremove callback (executed before an entity is removed from the database).

In many cases, EJB methods such as ejbPassivate() and ejbActivate() are left with empty implementations. You would like to remove the clutter of unimplemented methods from your EJB classes.

@Target({METHOD}) @Retention(RUNTIME) public @interface PreRemove {}

javax.persistence.PostRemove Marks a method in the entity or listener class as a postremove callback (executed after an entity is removed from the database).

The Business Object Pattern The business object pattern allows the session facade objects to access data via entity EJBs, without resorting to direct use of the connectors for the different resources As with the session facade, use of business objects is not compulsory but is recommended The principal functions of the business object pattern are as follows: The encapsulation of data access within the object-oriented model, which simplifies data access and avoids, for example, the need for SQL queries The EJB model advocates, among other things, use of Home interfaces for resolving business objects Use of deployment descriptors for the declarative and automatic introduction of nonfunctional properties such as persistence..

@Target({METHOD}) @Retention(RUNTIME) public @interface PostRemove {}

When you re developing EJBs, many times the numerous EJB lifecycle methods are left without meaningful implementation. This leaves beans with a more cluttered class file, with several empty methods. In addition, each time you develop a new bean, you could find yourself adding the empty methods via cut and paste. It would be nice to remove these methods from your bean class file and not have to add them for each new EJB.

javax.persistence.PostLoad Marks a method in the entity or listener class as a postload callback (executed before an entity is loaded from the database).

@Target({METHOD}) @Retention(RUNTIME) public @interface PostLoad {}

The Transfer Object Pattern The use of other design patterns can also improve the design of a J2EE application, particularly in terms of performance. The transfer object pattern allows us to group together services used by a facade. This is useful when the services have fine-grained parameters that can cause multiple sequences of calls between the client and the server, as these calls tend to induce a great deal of network traffic, especially costly connections. A transfer object implements the java.io.Serializable interface. The state of the transfer object corresponds to a set of parameters and return values for a group of services. A transfer object can be grouped inside another transfer object recursively; this is called a composite transfer object. Transfer objects are shared by the client and business layers. They must be accessible to both layers and are therefore defined in the application s Commons project.

For each type of EJB, create an adapter super class that defines all of the standard methods required for that type. Your bean classes can subclass the correct adapter

The annotations in this section are used for injecting JPA resources. javax.persistence.PersistenceContext Injects an instance of a container-managed entity manager.