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} catch (Exception e) { e.printStackTrace(); } } ... }

ing platforms and applications. In addition, with the creation of message-driven beans, other EJBs have the ability to use JMS messages to create asynchronous processes. Using JMS requires developers to write some special code, as well as set up the environment in the application server.

As you might have noticed from the code, MDBs are really session beans in JMS disguise. Like stateless beans, MDBs are not guaranteed to maintain state. The @MessageDriven annotation is the MDB counterpart of the @Stateless and @Stateful annotations it makes the container transparently provide messaging and other EJB services into a POJO. The activation configuration properties nested inside the @MessageDriven annotation tells the container what JMS destination the MDB wants to receive messages from.

Communication issues can arise when clients access the business servers in a three-tier J2EE environment. The client tier contains several design patterns that are designed to deal with the concerns that come with distributed communications. The J2EE design patterns for communication and data transfer most often impact the client side and occasionally impact the server side. Thus, these patterns represent an important source of crosscutting, especially when building multiclient applications. As previously explained, the use of J2EE design patterns is not mandatory. However, by using them, we can contrast aspect-oriented implementations with well-documented, wellknown, and proven reference designs.

join-column Used to show the relationship between two persisted entities. It is equivalent to the @JoinColumn annotation.

The method shown in listing 4.9 illustrates how to send a JMS message from a session bean. You use this method to send a message to a JMS topic, and the session bean loads the JMS topic connection factory from the application server with a JNDI lookup.

Element/Attribute Name name referenced-column-name unique nullable insertable Name of the column. Name of the column in the referenced table. Specifies whether the join column stores unique values. Specifies whether the relationship column is nullable or mandatory. Set to true if the column is included in the INSERT statement generated by the provider. Set to true if the column is included in the UPDATE statement generated by the provider. Definition of column. Useful for automatic table generation. Name of the target table name being joined. Description

primary-key-join-column Used either for a one-to-one relationship or for joining secondary tables for an entity. It is equivalent to @PrimaryKeyJoinColumn annotation.

The three main J2EE design patterns for client/server communication are the business delegate, the service locator, and the data transfer object. In this chapter, we illustrate these patterns used with and without the help of AOP. For simplicity, we use a basic Java client that accesses the sample application presented in 11 as well as this one. We discuss its limitations and show how aspects improve the client implementation independence with regard to the technology and the design choices.

private void publish(String subject, String content) { TopicConnection TopicSession TopicPublisher Topic TopicConnectionFactory try{ topicConnection = null; topicSession = null; topicPublisher = null; topic = null; Looks up the topic topicFactory = null; factory using the

Element/Attribute Name name referenced-column-name column-definition Description Name of the primary key column. Name of the referenced primary key column in the join table. Defines primary key column. Used for table creation.

Element/Attribute Name join-column inverse-join-column unique-constraint Description Defines join column for the owning side of the relationship. Defines join column for the inverse side of the relationship. Unique constraint of the join table. Used for automatic table creation. Name of the join table. Name of catalog where the table is stored. Name of the schema where the table is stored.

generator-value Used to define the generator used with a persistence field. It is equivalent to the @GeneratedValue annotation.

topicFactory = ( TopicConnectionFactory ) context.lookup("TopicFactory"); topicConnection = topicFactory.createTopicConnection(); topicSession = topicConnection.createTopicSession( false, Session.AUTO_ACKNOWLEDGE ); topic = ( Topic ) context.lookup( "ProcessorJMSTopic" ); topicPublisher = topicSession.createPublisher(topic);