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Each subclass is designed to suit the particular runtime environment of each bean type. As a result, they either add methods to the superclass or invalidate methods not suited for the bean type. For example, it doesn t make sense to call the isCallerInRole method from an MDB because the MDB is not invoked directly by a user. Using EJBContext As we discussed earlier, you can gain access to several container services such as transaction or security by using EJBContext. Interestingly, you can access EJBContext through DI. For example, a SessionContext could be injected into a bean as follows:

3.17 Decreasing the number of calls to an entity bean 5.2 Handling transaction management without the container 5.15 Holding a transaction across multiple JavaServer Pages

@Stateless public class PlaceBidBean implements PlaceBid { @Resource SessionContext context; ... }

IntroductionInterceptor interface, Spring AOP , 129 introspection joinpoint introspection, AspectJ, 33 35 thisJoinPoint keyword, 34 joinpoint introspection, JAC, 73 invariants, 179 Inversion of Control (IoC) see Dependency Injection, Spring AOP invisible parameter AnnotationIntroductionDef annotation, JBoss APO, 111 Invocation interface joinpoint introspection, JAC, 74 joinpoint introspection, JBoss AOP, 101 InvocationBase class invoke method, Interceptor interfacejoinpoint introspection, JBoss AOP, 101 coverage analysis, 183 JBoss AOP interceptors, 92 93, 100, 102 Spring AOP interceptors, 121 invoke method, JAC creating wrappers, 64, 72 invokeNext method, Interceptor interface JBoss AOP interceptors, 93, 100 invokeNext method, InvocationBase class joinpoint introspection, JBoss AOP, 101 regression analyzer, 188 invokeRoleMethod method, JAC, 79 Ioc (Inversion of Control) see Dependency Injection, Spring AOP isFrozen method Advised interface, Spring AOP, 133 isPerInstance method Advisor interface, Spring AOP, 125 isRuntime method MethodMatcher interface, Spring AOP, 123 isSingleton method, BeanFactory class Spring AOP, 117

In this code snippet, the container detects the @Resource annotation on the context variable and figures out that the bean wants an instance of its session context. The SessionContext adds a number of methods specific to the session bean environment, including getBusinessObject, getEJBLocalObject, getEJBObject, getInvokedBusinessInterface, and getMessageContext. All of these are fairly advanced methods that are rarely used. Note that the getEJBLocalObject and getEJBObject methods are meant for EJB 2 beans and will generate exceptions if used with EJB 3 beans. We won t discuss these methods further and will leave them for you to explore on your own. MessageDrivenContext adds no methods specific to MDB. Rather, it throws exceptions if the isCallerInRole, getEJBHome, or getEJBLocalHome methods are called since they make no sense in a messaging-based environment (recall that a message-driven bean has no business interface and is never invoked directly by the client). Much like a session context, a MessageDrivenContext can be injected as follows:

You have a complex series of JSP pages that users interact with to complete a function, such as filling out a registration form or running a wizard. In order to

@MessageDriven public class OrderBillingMDB { @Resource MessageDrivenContext context; ... }

It is illegal to inject a MessageDrivenContext into a session bean or a SessionContext into an MDB.

J2EE design solutions AOP advantages for business tier, 227 automatic integration solutions, 223 224 business tier design patterns, 219 221 improving, 228 246 client tier design patterns, 221 223 presentation tier design patterns, 223 J2EE environments Spring AOP, 113 j2eeclient.properties file deploying sample application, 208 jac (.jac) extension application-descriptor files, 78 JAC (Java Aspect Components), 61 89 aspects

This is about as much time as we need to spend on the EJB context right now. Rest assured that you ll see more of it in chapter 6. In the meantime, let s turn our attention back to a vital part of EJB 3 dependency injection. We provided a brief overview of DI in chapter 2 and have been seeing EJB DI in action in the last few chapters. We just saw an intriguing use case in injecting EJB contexts. In reality, EJB DI is a like a Swiss army knife: it is an all-in-one tool that can be used in unexpected ways. Let s take a look at some of these advanced uses next.

provide your users with the best experience, you persist the collected information from each page (or step) of the process. Because many steps persist information, you want to span the entire process with a single transaction started and committed from your JSP.