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Pass credentials in the messages sent to message-driven beans. In the onMessage() method, retrieve the credentials for comparison. One way to pass the credentials in the message is to set object properties in the message. The code in listing 7.6

As you can see, neither the User entity nor the related BillingInfo entity is managed when the persist method is invoked, since both are newly instantiated. Let s assume for the purpose of this example that the User and BillingInfo entities are saved into the USERS and BILLING_INFO tables, with the one-to-one relationship modeled with a foreign key on the USERS table referencing the BILLING_ID key in the BILLING_INFO table. As you might guess from looking at listing 9.5, two INSERT statements, one for the User and the other for the BillingInfo entity, are issued by JPA. The INSERT statement on the USERS table will contain the appropriate foreign key to the BILLING_INFO table. Cascading persist operations Perhaps surprisingly, it is not the default behavior for JPA to persist related entities. By default, the BillingInfo entity would not be persisted and you would not see an INSERT statement generated to persist the BillingInfo entity into the BILLING_ INFO table. The key to understanding why this is not what happens in listing 9.5 lies in the @OneToOne annotation on the billing property of the User entity:

public class User { @OneToOne(cascade=CascadeType.PERSIST) public void setBillingInfo(BillingInfo billing) {

Notice the value of the cascade element of the @OneToOne annotation. We deferred the discussion of this element in chapter 7 so that we could discuss it in a more relevant context here.

demonstrates placing a JMS message on a message queue for a message-driven bean to retrieve notice how it sets client credentials into the message.

As explained previously in 8, AOP offers alternate solutions to design patterns. Whether or not to use AOP depends on the needs of the programmer. The choice is guided mostly by implementation concerns such as code modularity, complexity, and evolution. However, these criteria are subjective and often difficult to evaluate up front. They become important during development, when the need for new functions makes the application s code more complex. Therefore, it is important to possess experience in developing real-world applications in order to accurately evaluate the advantages and disadvantages of a chosen solution, whether with AOP or otherwise. AOP is a young field, and feedback from those using it is still needed. This feedback should go far beyond regular design patterns, since AOP opens new possibilities. In the long term, good AOP practice should be identified and stated in a guide similar to the GoF s book. In such a guide, aspect-oriented design patterns would most likely handle problems such as code reuse, complexity, modularity, and evolution. As of now, these problems are rarely ever handled by regular design patterns. In this book, we provide a set of aspect-oriented techniques that allow programmers to deal with some of the aforementioned problems. These solutions include the implicit protocol, the anchoring protocol techniques, and the internationalization aspect, depicted later in 12 in the section Using AOP for UI Concerns. However, even though these techniques are reusable and open the door to good AOP practice, they do not replace designer expertise. It is the designer who is the key for identifying the crosscutting concerns that may appear at any level of the application.

Cascading in ORM-based persistence is similar to the idea of cascading in databases. The cascade element essentially tells the EntityManager how, or if, to propagate a given persistence operation on a particular entity into entities related to it. By default, the cascade element is empty, which means that no persistence operations are propagated to related entities. Alternatively, the cascade element can be set to ALL, MERGE, PERSIST, REFRESH, or REMOVE. Table 9.3 lists the effect of each of these values.

Table 9.3 Effects of various cascade type values. CascadeType Value CascadeType.MERGE Effect Only EntityManager.merge operations are propagated to related entities. Only EntityManager.persist operations are propagated to related entities. Only EntityManager.refresh operations are propagated to related entities. Only EntityManager.remove operations are propagated to related entities. All EntityManager operations are propagated to related entities.