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@ActivationConfigProperty( propertyName="acknowledgeMode", propertyValue="DUPS_OK_ACKNOWLEDGE") Table 4.1 JMS session acknowledge modes. For nontransacted sessions, you should choose the mode most appropriate for your project. In general, AUTO_ACKNOWLEDGE is the most common and convenient. The only other mode supported with MDB is DUPS_OK_ACKNOWLEDGE. Acknowledgment Mode AUTO_ACKNOWLEDGE Description The session automatically acknowledges receipt after a message has been received or is successfully processed. You have to manually acknowledge the receipt of the message by calling the acknowledge method on the message. The session can lazily acknowledge receipt of the message. This is similar to AUTO_ACKNOWLEDGE but useful when the application can handle delivery of duplicate messages and rigorous acknowledgment is not a requirement. This is returned for transacted sessions if the Session.getAcknowledgeMode method is invoked. Supported with MDB YES

Unlike system exceptions, application exceptions do not necessarily force a transaction to be rolled back. Application exceptions do not extend RuntimeException or RemoteException. Typically, they are used in validation situations, such as the one in the recipe. Application exceptions must be declared in the method declaration and are returned to the client without being wrapped in an EJBException or RemoteException. As you can see in the recipe, the InvalidUserDataException instance is thrown because either the user or the password was null. The application exception is thrown before any actual work is completed in the method, and therefore no rollback is needed. Obviously, this works only if your method has not done something that needs a rollback. While developing such methods, you must be careful to force rollbacks when necessary.

subscriptionDurability If our MDB is listening on a topic, we can specify whether the topic subscription is durable or nondurable. Recall that in the pub-sub domain, a message is distributed to all currently subscribed consumers. In general, this is much like a broadcast message in that anyone who is not connected to the topic at the time does not receive a copy of the message. The exception to this rule is what is known as a durable subscription.

Once a consumer obtains a durable subscription on a topic, all messages sent to the topic are guaranteed to be delivered to that consumer. If the durable subscriber is not connected to a topic when a message is received, MOM retains a copy of the message until the subscriber connects and delivers the message. The following shows how to create a durable subscriber:

attaching interceptor to pointcut, 99 definition of pointcut expression, 98 JBoss AOP pointcuts, 92, 95 black-box tests, 180 BMP (bean managed persistence) implementation of business object pattern, 239 Boolean operations, AspectJ, 38 broadcasting aspect, JAC, 84 BroadcastingAC aspect, JAC, 84 build.xml file, Ant compiling JBoss AOP application, 93 94 Burke, Bill, 91 business concerns, 10 business delegate pattern aspect-oriented implementation, 280, 283 dependency injection, 117 implementation for bank application, 273 J2EE design solutions, 222 business object pattern AOP based implementation, 240 242 modularization of business persistence, 242 246 regular implementation, 233 240 business persistence modularization of, 242 business preconditions aspect precondition factorization, 255 business tier AOP advantages for, 227 business tier aspects, 258 261 business tier components and their aspects, 270 improvements using AOP, 250 254 improving business tier design patterns business object pattern, 233 246 session facade pattern, 228 233 J2EE business tier design patterns, 219 221 precondition factorization, 254 resolving object references, 247 252 sample application, 206, 209 215 organizing business tier code, 214 BusinessComponents project, Eclipse IDE, 207 BusinessDelegates project, Eclipse IDE, 207 BusinessUtils project, Eclipse IDE, 207 byname value, autowire attribute bean data element, Spring AOP 119 , Byte Code Engineering Library (BCEL), 14, 70 byType value, autowire attribute bean data element, Spring AOP 119 ,

You want a transaction to cross two or more business methods within a single EJB, or you need to contain two or more business methods from two or more separate EJBs. Propagating transactions across methods lets you break up a multistep process into many methods or beans and still contain it in a single transaction. Using propagation lets you keep the benefits of a single transaction a single transaction and a single commit while letting you break up large sections of code into multiple methods and beans.

MessageConsumer playBoySubscriber = session.createDurableSubscriber( playBoyTopic, "JoeOgler");

Here, we are creating a durable subscription message consumer to the javax. jms.Topic playBoyTopic with a subscription ID of JoeOgler. From now on, all messages to the topic will be held until a consumer with the subscription ID JoeOgler receives them. You can remove this subscription with the following code: