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The <run-as> functionality was reintroduced in the EJB 2.0 specification. Using the <security-identity> element lets you assign a role to an EJB. If and when the EJB becomes a client to another EJB, it assumes this role. This allows you to apply method permissions against the client EJB as well as other EJBs to ask for the client s role. However, the identity role specified for this EJB does not have to be the identity that accesses the bean. For example, a client with the role READ_ONLY may access a session bean to obtain some data. That session bean has a security identity of ADMIN, which it uses to access other EJBs in order to complete the method invocation for its READ_ONLY client. Alternatively, you can declare the security identity of an EJB to always be the identity of the EJB client. For example:

That is, a category can contain multiple items and an item can belong to multiple categories. For example, a category named Sixties Fashion could contain items like Bellbottom Pants and Platform Shoes. Bellbottom Pants and Platform Shoes could also be listed under Uncomfortable and Outdated Clothing. Although many-to-many relationships can be unidirectional, they are often bidirectional because of their crossconnecting, mutually independent nature. Not too surprisingly, a bidirectional many-to-many relationship is often represented by @ManyToMany annotations on opposite sides of the relationship. As with the one-toone and one-many relationships, you can identify the owning side of the relationship by specifying mappedBy on the subordinate entity; you may have to use the targetEntity attribute if you re not using Java generics. The definition for @ManyToMany is identical to OneToMany and holds no special intricacies beyond those already discussed:

@Target({METHOD, FIELD}) @Retention(RUNTIME) public @interface ManyToMany { Class targetEntity() default void.class; CascadeType[] cascade() default {}; FetchType fetch() default LAZY; String mappedBy() default ""; }

The handling of annotations in Java programs brings several changes to the AspectJ language. The changes concern the definition of an aspect, the pointcut-definition language, and the introduction of annotations. Annotations and Pointcut Definitions You learned in the previous sections that a pointcut can capture elements of a Java program, such as methods and fields, and link them together in order to aspectize them. In this process, the writing of a pointcut relies heavily on the elements that define a field or method, such as the name, type, or signature. It then seems natural to incorporate annotations for fields or methods in the writing of a pointcut. With AspectJ 5, the pattern language for a pointcut descriptor is extended with the at-sign symbol (@) followed by an annotation name. For instance, the following expression execution( @Transaction * *.*(..) ) designates all the joinpoints that are executions of a method annotated with @Transaction, regardless of the method s return type, declaring class, name, or signature.

This entry makes the invoked EJB run under the identity of the client. If a READ_ONLY client invokes a bean with this type of identity (<use-caller-identity/>), the bean will also run under the role READ_ONLY.

To round off our discussion of many-to-many relationships, listing 7.9 shows how the Item-Category relationship might look.

@Stateless public class ItemManagerBean implements ItemManager { @PersistenceContext(unitName="actionBazaar") private EntityManager entityManager; public ItemManagerBean() {}

2.9 Specifying security roles in the bean source 7.2 Assigning and determining EJB client security roles

public Item addItem(String title, String description, byte[] picture, double initialPrice, long sellerId) { Item item = new Item(); item.setTitle(title); item.setDescription(description); Retrieves entity item.setPicture(picture); using primary key item.setInitialPrice(initialPrice); Seller seller = entityManager.find(Seller.class, sellerId); item.setSeller(seller); entityManager.persist(item); Persists entity instance

Several annotations can be specified, in which case all of them are required for the element to be included in the pointcut The Boolean OR operator (||) can be used between annotations to signify that at least one of the annotations must be present For instance, @(Foo || Bar) means that either @Foo or @Bar is required as an annotation The Boolean NOT operator (!) is used in front of an annotation For instance, !@Foo means that all elements that are not annotated with @Foo are included in the definition Joinpoints can be filtered according to the annotations available to the source and target objects of a method call The @this and @target operators are defined for this purpose For instance, the following expression call( * **(.) ) && @target( @Transaction ) designates all the calls to a method that is annotated with @Transaction.