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It is important to understand that it is impossible to use an IntroductionInterceptor without an IntroductionAdvisor. With introductions, the advisor is per-instance because it is stateful, and therefore you need a different instance of LockMixinAdvisor and LockMixin for each advised object, so that the locked variable is local to an advised bean.

@Target({TYPE}) @Retention(RUNTIME) public @interface SecondaryTable { String name(); String catalog() default ""; String schema() default ""; PrimaryKeyJoinColumn[] pkJoinColumns() default {}; UniqueConstraint[] uniqueConstraints() default {}; }

Notice that other than the pkJoinColumns element, the definition of the annotation is identical to the definition of the @Table annotation. This element is the key to how annotation works. To see what we mean, examine the following code implementing the User entity mapped to two tables:

Recipe 2.1 shows how to generate home (and other) interfaces for session and entity beans. In that recipe, we add creation methods to the home interface. In the case of entity beans, home interfaces often need to include finder methods. Adding these finder methods requires time-consuming changes to the interface and may cause file synchronization problems, as described in recipe 2.1.

@Entity @Table(name="USERS") @SecondaryTable(name="USER_PICTURES", pkJoinColumns=@PrimaryKeyJoinColumn(name="USER_ID")) public class User implements Serializable { ..}

By default, advice applies in the same order as constructed. At times, the programmer may want to guarantee a given order. In Spring, to make the factory automatically ensure an order, the advisor that installs the advice must implement the org.springframework.core.Ordered interface (see Listing 6-32). Listing 6-32. The Ordered Interface public interface Ordered { int getOrder(); } In advisors, getOrder returns Integer.MAX_VALUE by default, which means that it has the lowest priority (0 being the highest). To force an order, you can configure the order property of an advisor as any other bean; for example, to ensure that the lock mix-in showed in the previous section is applied with the highest priority, you use the code in Listing 6-33. Listing 6-33. Ordering the Lock Advisor <bean id="lockAdvisor" class="aop.spring.LockMixinAdvisor"> <property name="order"><value>0</value></property> </bean>

Obviously, the two tables in @Table and @SecondaryTable are related somehow and are joined to create the entity. This kind of relationship is implemented by creating a foreign key in the secondary table referencing the primary key in the first table. In this case, the foreign key also happens to be the primary key of the secondary table. To be precise, USER_ID is the primary key of the USER_PICTURES table and it references the primary key of the USERS table. The pkJoinColumns=@PrimaryKeyJoinColumn(name="USER_ID") specification assumes this relationship. The name element points to the USER_ID foreign key in the USER_PICTURES secondary table. The persistence provider is left to figure out what the primary key of the USERS table is, which also happens to be named USER_ID. The provider performs a join using the detected primary key in order to fetch the data for the User entity. In the extremely unlikely case that an entity consists of columns from more than two tables, we may use the @SecondaryTables annotation more than once for the same entity. We won t cover this case here, but encourage you to explore it if needed. Before we conclude the section on mapping entities, let s discuss a vital feature of JPA: primary key generation.

To generate the finder method declaration, use the @ejb.finder tag in the classlevel JavaDoc of your bean source. For example, the following class section of

You may want to work around this by having your servlets implement SingleThreadModel. Although doing so may seem harmless, keep in mind that this is a deprecated feature (since servlet 2.4) and we don t recommend using it because of the many limitations it imposes on applications. This topic is beyond the scope of this book (see www.esus.com/ javaindex/j2ee/servlets/servletdiffthread.html).

The right way to use a container-managed EntityManager is by avoiding dependency injection and instead performing a JNDI lookup. Bear in mind that the JNDI lookup mechanism can be used in any nonmanaged or managed class. To use a container-managed EntityManager, you must first establish the references to the persistence unit using either the @PersistenceContext annotation at the class level or the persistence-context-ref element in web.xml. If you re using a managed class such as a servlet or JSF managed bean, then you can establish the reference as follows:

Since Spring AOP is dynamic AOP, advice can be dynamically attached or detached from a given advised object.

@PersistenceContext(name = "actionBazaar/EntityManager", unitName = "actionBazaar") public class ActionBazaarBidControllerServlet extends HttpServlet { private EntityManager entityManager; ... }