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@Resource and annotation inheritance In chapter 3, you learned that an EJB bean class may inherit from another EJB class or a POJO. If the superclass defines any dependencies on resources using the @Resource annotation, they are inherited by the subclass. For example, BidManagerBean extends another stateless EJB, PlaceBidBean, where PlaceBidBean defines a resource, as in this example:

be used to store messages even when no entity is ready to retrieve them (referred to as durable subscriptions).

run options, JAC, 88 run-time weaving, 13 hooks, 14

@Stateless public class PlaceBidBean implements PlaceBid{ @Resource(name="censorship") private boolean censorship; .. } @Stateless public class BidManagerBean extends PlaceBidBean implements BidManager{ .. }

The environment entry defined in the PlaceBidBean will be inherited by the BidManagerBean and dependency injection will occur when an instance of BidManagerBean is created. As useful as DI is, it cannot solve every problem. There are some cases where you must programmatically look up resources from a JNDI registry yourself. We ll talk about some of these cases next, as well as show you how to perform programmatic lookups.

The code in listing 6.1 shows a private method, publish(), that can be used in any object that wishes to send a JMS message to a publish/subscribe topic.

Although you can use the @EJB or @Resource annotation to inject resource instances, you may still need to look up items from JNDI in several advanced cases (if you are unfamiliar with JNDI itself, check out the brief tutorial in appendix A). You can use the @EJB or @Resource annotation at the EJB class level to define dependency on an EJB or a resource. There are two ways of using programmatic lookups using either the EJB context or a JNDI initial context. We ll look at both methods. Recall from our earlier discussion that you can look up any object stored in JNDI using the EJBContext.lookup method (including session bean references). This technique can be used to accomplish one extremely powerful feature that DI cannot accomplish: using lookups instead of DI allows you to determine which resource to use dynamically at runtime instead of being constrained to using static configuration that cannot be changed programmatically. All you have to do

is specify a different name in the lookup method to retrieve a different resource. As a result, program logic driven by data and/or user input can determine dependencies instead of deploy-time configuration. The following code shows the EJB context lookup method in action:

sample application client for, 272 Customer interface, 213 table creation script, 208 transfer object for, 278 sample application architecture, 205 219 business tier, 209 215 entity EJBs, 213 214 session facades, 209 212 client tier web client, 216 data tier, 208 209 deploying application, 207 organizing and packaging code, 207 overview, 205 208 tiers, 205 206 using Eclipse IDE, 206 web presentation tier, 219 sample application design, 219 225 using AOP, 225 using J2EE design solutions automatic integration solutions, 223 business tier design patterns, 219 221 client tier design patterns, 221 223 presentation tier design patterns, 223 Seinturier, Lionel, 61 selectByCustomerId method, AccountBean class, 238 selectByPrimaryKey method, AccountBean class, 238 separation of concerns, 287 service locator pattern design patterns for business layer access, 277 eliminating business delegates, 280 session facade pattern AOP based implementation, 232 J2EE design solutions, 220 regular implementation, 228 232 session facades Bank facade, 209 212 business delegate methods retrieving, 276 session management aspect, JAC, 83 SessionAC aspect, JAC, 83 SessionBean interface business object pattern, 240 session facade pattern, 228, 232 set data element, Spring AOP 118 , set joinpoint type, AspectJ, 36, 42 setBalance method, 265 setDate method, Order Class, AspectJ, 47

private void publish(String subject, String content) { TopicConnection TopicSession TopicPublisher Topic TopicConnectionFactory topicConnection = null; topicSession = null; topicPublisher = null; topic = null; topicFactory = null;

@EJB(name="ejb/BidderAccountCreator", beanInterface = BidderAccountCreator.class) @Stateless public class GoldBidderManagerBean implements GoldBidderManager { @Resource SessionContext sessionContext; ... BidderAccountCreator accountCreator = (BidderAccountCreator) sessionContext.lookup( "ejb/BidderAccountCreator"); ... accountCreator.addLoginInfo(loginInfo); ... accountCreator.createAccount();