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EJB clients don t always reside in the client layer. Many times, a client to an EJB is another EJB, and you need to ensure that the client EJB will have the necessary permission to access the methods on the second EJB. You need your client EJB to run as a particular role when interacting with a second EJB. Doing this allows you to avoid passing user credentials from bean to bean.

Imagine, however, what would happen if we did not use generics on the Set. In this case, it would be impossible for the persistence provider to determine what entity the Item object has a relation to. This is exactly the situation the targetEntity parameter is designed for. We would use it to specify the entity at the other end of the one-to-many relationship as follows:

@OneToMany(targetEntity=Bid.class,mappedBy="item") protected Set bids;

To assign a role to an EJB, use the <security-identity> tag within the bean section of the deployment descriptor, as shown in listing 7.3.

Many-to-one as owning-side of relationship Also, note the mappedBy="item" value on the @OneToMany annotation. This value specifies the owning side of the bidirectional relationship as the items field of the Bid entity. Because the relationship is bidirectional, the Bid domain object has a reference to an Item through the item variable. The @ManyToOne annotation on the item variable tells the persistence provider that more than one Bid entity could hold references to the same Item instance. For bidirectional one-to-many relationships, ManyToOne is always the owning side of the relationship. Because of this fact, the mappedBy element does not exist in the definition of the @ManyToOne annotation:

By default, AspectJ is a compile-time weaver. Given a set of .java source files and a set of aspects, the ajc command-line tool produces a set of .class files in which the aspects are woven to the classes. Since version 1.2, AspectJ can weave code at load time. The source code of the program is no longer required, and AspectJ can weave any class that can be obtained with the class-loading mechanism of the Java language.

@Target({METHOD, FIELD}) @Retention(RUNTIME) public @interface ManyToOne { Class targetEntity() default void.class; CascadeType[] cascade() default {}; FetchType fetch() default EAGER; boolean optional() default true; }

<ejb-jar> <enterprise-beans> <entity> <!-- Bean data here --> <security-identity> <run-as> <role-name> ADMIN </role-name> </run-as> </security-identity> </entity> </enterprise-beans> <assembly-descriptor > </assembly-descriptor> </ejb-jar>

Other than this minor difference, all the other elements of the @ManyToOne annotation have the same purpose and functionality as the elements in the @OneToOne and @OneToMany annotations. The last type of domain relationship is many-to-many, which we ll discuss next.

While not as common as one-to-many, many-to-many relationships occur quite frequently in enterprise applications. In this type of relationship, both sides might have multiple references to related entities. In our ActionBazaar example, the relationship between Category and Item is many-to-many, as shown in figure 7.7.

During the writing of this book, AspectJ 1.2.1, which was released on November 5, 2004, was the latest stable version of AspectJ. However, a newer version, numbered 1.5.0 and officially called AspectJ 5, is under preparation. The first major developments of AspectJ 1.5.0M1 were made available to the developing community in December 2004. The main purpose of this evolution was to incorporate the changes brought to the Java language by Java 5. The features described in the remainder of this section can be found in the developer release of AspectJ 1.5.0, which is available at the time of the writing of this book. By the time AspectJ 5 is final, these features may have slightly changed according to user s feedback, design choices, or error corrections. Most of the changes brought by AspectJ 5 deal with annotations (also known as metadata). First, an aspect can deal with an annotated Java program. The annotations defined for classes or methods can be taken into account when defining a pointcut. Also, annotations can be introduced into a Java program. Second, annotations have an impact on the syntax of the AspectJ language itself. Instead of using dedicated keywords such as aspect and pointcut, you can write annotated Java classes that will be understood by the AspectJ weaver as aspects. These two categories of features are presented in the remainder of this section.

Figure 7.7 The relationship between Category and Item is many-to-many because every category may have one or more items, whereas each item may belong to more than one category.