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entity or in any entity in the POJO hierarchy. Field-based persistence is a one-way street in another important way: you give up the OO benefits of encapsulation/ data hiding that you get from getters and setters if you expose the persistence fields to be directly manipulated by clients. Even if you used field-based access, we recommend that you make the fields private and expose the fields to be modified by getter/setter method. For example, property setters are often used in nontrivial applications to validate the new data being set or to standardize POJO data in some fashion. In our example, we could automatically convert Category names to uppercase in the setName method:

public void setName(String name) { this.name = name.toUpperCase(); }

Finally, you must reference this role for a particular EJB. You should place the following within the bean section of the deployment descriptor; it creates a logical role used by the EJB and maps it to a logical role in the assembly descriptor:

In general, we highly recommend that you use field-based access with accessor methods or property-based access. It is much easier to have it and not need it than to find out that you need it later on and have to engage in a large-scale, painful refactoring effort in the face of deadlines. By default, the persistence provider saves all entity fields or properties that have JavaBeans-style public or protected setters and getters (for example, getName and setName in listing 7.1). In addition, persisted setters and getters cannot be declared final, as the persistence provider may need to override them. Defining a transient field If necessary, you can stop an entity property from being persisted by marking the getter with the @Transient annotation. A transient field is typically useful for caching some data that you do not want to save in the database. For example, the Category entity could have a property named activeUserCount that stores the number of active users currently browsing items under the directory or a generatedName field that is generated by concatenating the category ID and name. However, saving this runtime information into the database would not make much sense. You could avoid saving the property by using @Transient as follows:

When an exception is declared by advice code, the type of the exception must also be specified in the signature of the joinpoint. For instance, a method-execution joinpoint must list the exception in the throws clause. This is a limitation that obliges the application code to be aware of the exceptions thrown by the aspects. In practice, this limitation can be solved by specifying that the advice code raises an exception of type RuntimeException. In Java, run-time exceptions are unchecked; therefore, the signatures of the program methods can be left unchanged.

@Entity public class Category { ... @Transient protected Long activeUserCount; transient public String generatedName ...

<security-role-ref> <description> Users with this role are in the Administrators group </description> <role-name> Administrator </role-name> <role-link> ADMIN </role-link> </security-role-ref>

public Long getActiveUserCount() { return activeUserCount; }

public void setActiveUserCount(Long activeUserCount) { this.activeUserCount = activeUserCount; } ... }

As stated in the chapter introduction, security roles are a declarative method of setting up client boundaries around an EJB. The <security-role> element of the assembly descriptor sets up logical roles used to group EJB clients. The <securityrole-ref> element maps logical roles used by an EJB to a security role defined in the assembly descriptor or in the runtime environment. For instance, the recipe sets up a runtime role ADMIN and links it to users of the bean with the Administrator role. The <role-link> tag is optional for the <security-role-ref> element, but if it is not provided to map to a <security-role> in the assembly descriptor, it must be mapped to a role in the runtime environment (see your vendor documentation). The logical roles set up in the deployment descriptor are just that: logical roles. They are only labels declared before runtime. Each role must be mapped to an existing security realm in the runtime environment. Again, this important step will differ across vendors, and you should consult your documentation for the exact process. The isCallerInRole() method is used to determine the appropriate action of a method. Take the following implementation of a business method: