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Using @JoinColumn If the underlying table for the referencing entity is the one containing the foreign key to the table to which the referenced child entity is mapped, you can map the relationship using the @JoinColumn annotation (figure 8.4). In our User-BillingInfo example shown in figure 8.4, the USERS table contains a foreign key named USER_BILLING_ID that refers to the BILLING_INFO table s BILLING_ID primary key. This relationship would be mapped as shown in listing 8.7.

To generate the interfaces (home, local home, remote, and local), you must do two things. You need to add the appropriate XDoclet tags to the bean implementation class, and then add the correct subtasks to the <ejbdoclet/> task in your build.xml file. This recipe covers adding create and business methods to the correct interfaces. Other methods, such as finder methods, are covered in later recipes. A session bean example The session bean example in listing 2.1 illustrates how to document a bean class in order to generate both remote and local interfaces. The XDoclet tags are shown in bold. Notice that assigned values for the tags always use double quotes.

@Entity @Table(name="USERS") public class User { @Id @Column(name="USER_ID") protected String userId; ... @OneToOne Foreign key @JoinColumn(name="USER_BILLING_ID", referencedColumnName="BILLING_ID", updatable=false)

protected BillingInfo billingInfo; } @Entity @Table(name="BILLING_INFO") public class BillingInfo { @Id @Column(name="BILLING_ID") protected Long billingId; ... }

1. Ralph Johnson, Framework = (compopnents + patterns), Communications of the ACM, 40(10), (1997) 39 42.

The @JoinColumn annotation s name element refers to the name of the foreign key in the USERS table b. If this parameter is omitted, it is assumed to follow this form:

package ch2; import javax.ejb.*; /** Declares the * @ejb.bean type="Stateful" bean attributes * view-type="both" */ public class UserBean implements SessionBean { private String name = null; public UserBean(){} public void setSessionContext( SessionContext context) {} /** * @ejb.create-method */ public void create(){} public void ejbCreate() {} public void ejbRemove() {} public void ejbLoad() {} public void ejbStore() {} public void ejbActivate() {} public void ejbPassivate() {} /** * @ejb.interface-method */ public void setName( String value ) { this.name = value;

In our example, the foreign key name would be assumed to be BILLINGINFO_ BILLING_ID in the USERS table. The referencedColumnName element specifies the name of the primary key or a unique key the foreign key refers to. If you don t specify the referencedColumnName value, it is assumed to be the column containing the identity of the referenced entity. Incidentally, this would have been fine in our case as BILLING_ID is the primary key for the BILLING_INFO table C. Like the @Column annotation, the @JoinColumn annotation contains the updatable, insertable, table, and unique elements. The elements serve the same purpose as the elements of the @Column annotation. In our case, updatable is set to false, which means that the persistence provider would not update the foreign key even if the billingInfo reference were changed. If you have more than one column in the foreign key, you can use the JoinColumns annotation instead. We won t cover this annotation since this situation is very unlikely, if not bad design. If you have a bidirectional one-to-one relationship, then the entity in the inverse side of the relationship will contain the mappedBy element, as we discussed in chapter 7. If the User and BillingInfo entities have a bidirectional relationship, we must modify the BillingInfo entity to have the one-to-one relationship definition pointing to the User entity as follows:

@Entity public class BillingInfo { @OneToOne(mappedBy="billingInfo") protected User user; .. }

} /** * @ejb.interface-method */ public String getName() { return name; } }