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Security roles are useful in and of themselves, but they would hardly be worth the trouble if you could use them only for the isCallerInRole() method from the EJBContext class The EJB deployment descriptor also allows you to map security roles to actual EJB methods The <method-permission> tag builds a many-to-many relationship between roles and methods, where a role is given access permission to certain methods The <method-permission> tag contains an optional <description> element, at least one <role-name> element, and at least one <method> element To grant a role permission to use a method, you name the role in the <role-name> element, and name the method in the <method> element (using its <ejb-name> and <methodname> elements) The recipe demonstrates this in two ways It names specific methods for the READ_ONLY role, allowing access only to getter methods.

@Entity public class User { @Id protected String userId; protected String email; @OneToOne protected BillingInfo billingInfo; } @Entity public class BillingInfo { @Id protected Long billingId; protected String creditCardType; ..

When no order is defined, or when the order is defined for some aspects but not for others, AspectJ applies the following rules:

protected String routingNumber; @OneToOne(mappedBy="billingInfo", optional="false"); protected User user; }

It also uses an * as a wildcard, indicating that the role ADMIN can access all methods within the EmployeeBean EJB The only acceptable use of the wildcard is by itself You cannot use something like get* for a method name; only a single * will work Finally, the recipe provides an example of the <unchecked/> method permission If a method permission is declared unchecked, the method can be invoked by any client of any role In other words, no security checks will occur when a client invokes the specified method An unchecked method permission overrides all other permissions that might be specified for that method All methods from the EJB s remote, home, and super interfaces can be set up with permissions Any method that is excluded from the method permissions list cannot be accessed by any role.

In listing 7.7, the User class still has a relationship to the BillingInfo class through the billingInfo variable b. However, in this case the relationship is bidirectional because the BillingInfo class also has a reference to the User class through the user field C. The @OneToOne annotation on the user field has two more interesting things going on. The first is the mappedBy="billingInfo" specification C. This tells the container that the owning side of the relationship exists in the User class s billingInfo instance variable. The concept of a relationship owner doesn t originate from domain modeling. It exists as a convenience to define the database mapping for a relationship only once instead of repeating the same mapping for both directions of a relationship. You ll see this concept in action in chapter 8 when we describe O/R mapping. For now, simply note the role of the mappedBy attribute. The second interesting feature of the @OneToOne annotation on the user field is that the optional parameter is set to false this time. This means that a BillingInfo object cannot exist without a related User object. After all, why bother storing credit card or bank account information that is not related to an existing user

7.3.2 @OneToMany and @ManyToOne As you might have gathered from the ActionBazaar domain model in figure 7.3, one-to-many and many-to-one relationships are the most common in enterprise systems. In this type of relationship, one entity will have two or more references of another. In the Java world, this usually means that an entity has a collection-type field such as java.util.Set or java.util.List storing multiple instances of another entity. Also, if the association between two entities is bidirectional, one side of the association is one-to-many and the opposite side of the association is many-to-one. In figure 7.6, the relationship between Bid and Item is one-to-many from the perspective of the Item object, while it is many-to-one from the perspective of