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Sending JMS messages Creating a message-driven EJB Processing messages first in, first out Putting business logic in message-driven beans Streaming data with JMS Triggering multiple message-driven beans Speeding up message delivery Using message selectors Handling errors in a message-driven bean Sending email asynchronously Handling rollbacks in a message-driven bean

Accessing e-mail resources In addition to JDBC data sources and JMS resources, the other heavy-duty resource that enterprise applications often use is the JavaMail API, javax.mail. Session. JavaMail Sessions that abstract e-mail server configuration can be stored in the application server JNDI registry. The Session can then be injected into an EJB (with the @Resource annotation) and used to send e-mail. In the ActionBazaar application, this is useful for sending the winning bidder a notification after bidding on an item is over. The DI code to inject the mail Session looks like this:

RAD (rapid application development) environment programming in UMLAF, 85 real-world behavior, 10

@Resource(name="mail/ActionBazaar") private javax.mail.Session mailSession;

You want to send a JMS message to a message topic (known as publish/subscribe messaging).

We ll leave configuring a mail session using the deployment descriptor as an exercise for you, the reader. You can find the one-to-one mapping between annotations and deployment descriptors in appendix D. Accessing the timer service The container-managed timer service gives EJBs the ability to schedule tasks in a simple way. (You ll learn more about timers in section 5.4.) We inject the container timer service into an EJB using the @Resource annotation:

@Resource javax.ejb.TimerService timerService;

recorder coverage analysis, 183 185 recordMethodCall method, 183 redundancy in aspects, 20 ref data element, Spring AOP 118 , reference record regression tests, 186 references implementation of business object pattern, 239 resolving object references, 250 referential integrity constraints integrity aspect, JAC, 84 reflection description, 23 run-time type identification (RTTI), 87 regexp library operators, 69 see also regular expressions regexp pointcuts, Spring AOP, 124 regression analyzer, 186 regression interceptor, 189 regression testing nonregression tests, 185 190 regular expressions host expression, 84 using GNU regexp with JAC, 69 @Release annotation, JBoss AOP, 110 releaseConnection method, TxControllerBean class, 232 reliability OOP 3 , REMOVERS method-type operators, JAC, 71 research team, JAC, 61 residues, 179 resolving object references, 247 252 Retry aspect, 284 285 client/server communication, 292 retry policy business delegate pattern, 276 return types advice code types, AspectJ, 46 wildcard for return types, 31 reusability Chain of Responsibility pattern, 167 Command pattern, 164 design patterns in AOP, 150 elements of reusable software, 149 example with exception handlers, 80 Observer pattern, 161 OOP 3 , session facade pattern, 233 role methods introduction feature, JAC, 79 80 RTTI (run-time type identification), 87

Enterprise applications can now use the JMS to communicate to outside applications or other application servers. EJBs can use JMS to decouple communication with these other systems in an asynchronous manner using a publish/subscribe pattern. JMS message topics create a one (the sender) to many (the receiver) relationship between messaging partners. In addition, publish/subscribe topics can

Just as with the EJB context, the timer service is not saved in JNDI, but the container resolves the resource by looking at the data type of the injection target. The @Resource annotation may be used for injecting EJB references accessible via JNDI into other EJBs. However, the @EJB annotation is intended specifically for this purpose and should be used in these circumstances instead. Refer to the discussion in chapter 3 for details about this annotation.

As you might have noted, the one DI feature glaringly missing is the ability to inject resources into POJOs and to inject POJOs that are not EJBs. You can still indirectly accomplish this by storing POJOs in the JNDI context (not a particularly easy thing to do) or using proprietary extension of your container vendor. We hope that a future version of EJB 3 will provide expanded support for POJO injection similar to other lightweight DI-capable frameworks like Spring. You can also use POJO injection with Spring-enabled EJB 3 beans if you really need POJO injection in your EJB applications. We ll save the topic of EJB 3 and Spring for chapter 16. We have provided a workaround for POJO injection in chapter 12.