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In addition to fields and methods, the introduction mechanism provided by AspectJ allows you to modify the inheritance and implementation hierarchies defined in an application. The declare parents keyword combination permits this. The following aspect adds the AddDateItf interface to the Order class and creates an inheritance link between AddDateImpl and Order: public aspect AddDate2 { declare parents: Order implements AddDateItf; declare parents: Order extends AddDateImpl; } The addition of a new interface is always possible since there are no constraints in Java on the number of interfaces implemented by a class. This is not the case for inheritance because only a single inheritance is supported in Java. In the previous example, if the Order class was already a subclass of the Document class, the modification of the inheritance link by the AddDate2 aspect would have produced a compiler error. The names of the classes to be modified can contain wildcards. Logical expressions created with the Boolean OR operator (||) can be written to modify several classes with a single declaration.

map to 103.79 and we would have a primary key violation! Another type you should avoid choosing as identifier is TimeStamp. An important consideration to note is that using the @Id annotation on its own works only for identities with just one field or property. In reality, you ll often have to use more than one property or field (known as composite key) to uniquely identify an entity. For sake of illustration, assume that we changed our minds and decided that a Category is uniquely identified by its name and creation date. There are two ways we can accomplish this: by using either the @IdClass or @EmbeddedId annotation. The @IdClass annotation In effect, the @IdClass annotation enables you to use more than one @Id annotation in a sensible way. This is the basic problem with using more than one @Id field or property in an entity class: it is not obvious how to compare two instances in an automated fashion. This is especially true since in cases where composite keys are necessary, one or more of the fields that constitute the primary key are often relationship or association fields (or foreign keys in database terminology). For example, although this is not the case for us, the Bid domain object might have an identity consisting of the item to bid on, the bidder, as well as a bid amount:

You want your clients to pass along their security credentials to the EJB container when looking up or invoking an EJB.

public class Bid { private Item item; private Bidder bidder; private Double amount; ... }

In this snippet, both the item and bidder instance variables represent relationship references to other entities. You could be tempted to combine item, bidder, and amount as a composite key for Bid, but remember that it might be the case that neither of the references is simple enough to compare instances using the equals method, as it would be for a java.lang.String or java.lang.Long. This is where a designated IdClass comes in. The best way to understand how this works is through an example. For simplicity, we ll return to our Category object with the name and creation date identity. Listing 7.2 shows how the solution might look.

The last element that can be introduced performs the function of catching the exceptions that are raised by an application. The exceptions raised by the application are wrapped in a special exception called org.aspectj.lang.SoftException.

public class CategoryPK implements Serializable { String name; Date createDate;

Working within your application server, you have mapped certain users into specific logical roles. In addition, you have set up the security roles (see recipe 7.2) in the deployment descriptors for your EJB s. However, EJB clients must pass their security credentials to the EJB container in order for EJBs to acquire the user information.

public CategoryPK() {}

comparing identity public boolean equals(Object other) { if (other instanceof CategoryPK) { final CategoryPK otherCategoryPK = (CategoryPK)other; return (otherCategory.name.equals(name) && otherCategoryPK.createDate.equals(createDate)); }

To pass the client s credentials to the EJB container, create the JNDI InitialContext object using a set of properties that defines the client s credentials (listing 7.1).