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try { Hashtable env = new Hashtable(); env.put( Context.INITIAL_CONTEXT_FACTORY, getContextURL() ); env.put( Context.PROVIDER_URL, getContextURL() ); InitialContext jndi = new InitialContext( env ); //create a JMS connection factory TopicConnectionFactory factory = ( TopicConnectionFactory ) jndi.lookup( getConnectionFactoryClassName() ); //creation a JMS connection TopicConnection connection = factory.createTopicConnection(); TopicSession session = connection.createTopicSession( false, Session.AUTO_ACKNOWLEDGE ); //Look up a JMS Topic Topic theTopic = ( Topic ) jndi.lookup( getTopicName() ); TopicPublisher publisher = session.createPublisher( theTopic ); connection.start(); jndi.close(); //publish a message javax.jms.Message message = session.createMessage(); message.setObjectProperty( "USERNAME", getUserName() ); message.setObjectProperty("PASSWORD", getPassword() ); //add more to the message . publisher.publish( message ); } catch( javax.naming.CommunicationException cex ){ //handle error } catch( Exception e ){ e.printStackTrace(); }

Since in our case we have set the cascade element to PERSIST, when we persist the User entity, the EntityManager figures out that a BillingInfo entity is associated with the User entity and it must be persisted as well. As table 9.3 indicates, the persist operation would still be propagated to BillingInfo if the cascade element were set to ALL instead. However, if the element were set to any other value or not specified, the operation would not be propagated and we would have to perform the persist operation on the BillingInfo entity separately from the User entity. For example, let s assume that the cascade element on the @OneToOne annotation is not specified. To make sure both related entities are persisted, we d have to change the addUser method as shown in listing 9.6.

AspectJ 5 supports the five aspect-instantiation modes the default singleton mode, perthis, pertarget, percflow, and percflowbelow that are available in the previous version. (See the Aspect Instantiation section earlier in this chapter for further details.) AspectJ 5 introduces a sixth mode: PERTYPEWITHIN. With this mode, a new aspect instance is created for each new type that is designated in the pointcut expression associated with PERTYPEWITHIN. The following aspect illustrates the PERTYPEWITHIN mode: @Aspect( instantiationModel=AspectInstantiationModel.PERTYPEWITHIN, perClausePattern="aop.aspectj.*") public class FooBarAspect { ... } This aspect will be instantiated for each different class that is defined in the aop.aspectj package.

public User addUser(String username, String email, String creditCardType, String creditCardNumber, Date creditCardExpiration) { User user = new User();

After picking up a message, the message-driven bean must retrieve the client s credentials. The message-driven bean sample in listing 7.7 contains an onMessage() implementation that retrieves a username and password from a message.

user.setUsername(username); user.setEmail(email); BillingInfo billing = new BillingInfo(); billing.setCreditCardType(creditCardType); billing.setCreditCardNumber(creditCardNumber); billing.setCreditCardExpiration(creditCardExpiration); entityManager.persist(billing); user.setBillingInfo(billing); entityManager.persist(user); return user; }

As you can see, the BillingInfo entity is persisted first. The persisted BillingInfo entity is then set as a field of the User entity. When the User entity is persisted, the generated key from the BillingInfo entity is used in the foreign key for the generated INSERT statement. Having explored the persist operation, let s now move on to the next operation in the EntityManager CRUD sequence retrieving entities.

Autoboxing does not impose any changes on the AspectJ language. The fact that primitive types (int, float, double, and so on) are equivalent to their class-based ones (Integer, Float, Double, and so on) simply means that when the AspectJ compiler computes the joinpoints that match a given pointcut, the compiler does not distinguish between a primitive type and its class-based counterpart. Variable-length argument lists can be used when you write a pointcut descriptor. For instance, the following pointcut descriptor call( * *.*( double, Object... ) ) designates all the calls to all the methods that take at least a double argument and a variablelength list of Object arguments as parameters.

public class SecureMDB implements MessageDrivenBean, javax.jms.MessageListener { public void setMessageDrivenContext(MessageDrivenContext mdc){ } public void onMessage( Message msg ){ String username = ( String ) msg.getObjectProperty( "USERNAME" ); String password = ( String ) msg.getObjectProperty( "PASSWORD" ); //verify username and password, perform actions } }

JPA supports several ways to retrieve entity instances from the database. By far the simplest way is retrieving an entity by its primary key using the find method we introduced in listing 9.1. The other ways all involve using the query API and JPQL, which we ll discuss in chapter 10. Recall that the find method was used in the addItem method in listing 9.1 to retrieve the Seller instance corresponding to the Item to add:

Seller seller = entityManager.find(Seller.class, sellerId);