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@Entity public class User { ... String userId; String username; String email; ... }

@Entity public class Seller extends User { ...

In recipe 7.1, we showed how an EJB can determine the caller s identity (the username, for instance) and make informed decisions. In EJB applications, the application server has the ability to map a set of users to a logical role. By placing users into roles, you can programmatically assign permissions. For instance, you can limit application functionality based on the client s role.

After throwing advice code is executed when a given joinpoint that is associated with a pointcut descriptor ends its execution by raising an exception. The following code illustrates the usage of the after throwing type: after() throwing (Exception e): ... { System.out.println("The raised exception is: "+e); } The exception that is raised by the joinpoint can be accessed with the variable defined in parentheses following the after throwing keywords. In the previous example, the variable is e. This variable can be used anywhere in the body of the advice code.

@Entity public class Bidder extends User { ...

Because the parent User class is declared an entity, all the inherited fields like username and email are persisted when either the Seller or Bidder entity is saved. A slightly counterintuitive nuance you should note is that this would not be the case if the User class were not an entity itself. Rather, the value of the inherited properties would be discarded when either Seller or Bidder is persisted. The preceding code snippet also demonstrates an interesting weakness the User class could be persisted on its own, which is not necessarily desirable or appropriate application behavior. One way to avoid this problem is to declare the User class abstract, since abstract entities are allowed but cannot be directly instantiated or saved. In any case, this is probably better OO design anyway. Since JPA supports entity inheritance, the relationship between entities and queries may be polymorphic. We discuss handling polymorphic queries in chapter 10. Obviously the ultimate goal of persistence is to save the properties of the entity into the database (such as the name and modification date for the Category entity in listing 7.1). However, things are not as simple as they seem, and there are a few twists regarding entity data persistence that you need to have a good grasp of.

To determine the client s role, use a method from the EJBContext instance set inside your EJB:

7.2.2 Persisting entity data An entity, because it is a persistent object, has some state that is stored into the database. In this section we discuss access types, how to define a transient field, and data types supported by JPA.

Around advice code is executed before and after each associated joinpoint. The proceed keyword executes the joinpoint, which is bound by the before and after parts of the advice code. Specifically, this keyword executes the joinpoint in the following way: 1. The before part is executed. 2. The joinpoint is executed when the proceed keyword is used. 3. The after part is executed. In around advice code, the before or after part can be empty; then, the around advice code is equivalent to before or after advice code. The proceed keyword is optional in around advice code. If proceed is not used, the joinpoint is not executed. This behavior could

Field- vs. property-based persistence An entity maintains its state by using either fields or properties (via setter and getter methods). Although JavaBeans object property-naming conventions have been

boolean inAdminRole = ejbContext.isCallerInRole( "Administrator" );