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3 6. A and B are correct. RMI uses stubs and skeletons. C and D are incorrect because ORBs and IIOP are used with CORBA. 3 7. C is correct. Security is not a tier of a three-tiered architecture. A, B, and D are tiers of a three-tiered architecture. 3 8. C is correct because it is not true about RMI. RMI uses the proxy design pattern in the stub and skeleton layer. In the proxy pattern, an object in one context is represented by another (the proxy) in a separate context. The proxy knows how to forward method calls between the participating objects. In RMI s use of the proxy pattern, the stub class plays the role of the proxy. RMI uses a technology called Object Serialization to transform an object into a linear format that can then be sent over the network wire. The RMI compiler, rmic, is used to generate the stub and skeleton files. A, B, and D are incorrect.
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7.01 List the Required Classes/Interfaces That Must Be Provided for an Enterprise JavaBeans Component Distinguish Between Session and Entity Beans Recognize Appropriate Uses for Entity, Stateful Session, and Stateless Session Beans Distinguish Between Stateful and Stateless Session Beans State the Benefits and Costs of Container-Managed Persistence State the Transactional Behavior in a Given Scenario for an Enterprise Bean Method with a Specified Transactional Deployment Descriptor Given a Requirement Specification Detailing Security and Flexibility Needs, Identify Architectures That Would Fulfill Those Requirements 7.08 Identify Costs and Benefits of Using an Intermediate Data Access Object Between an Entity Bean and the Data Resource State the Benefits of Bean Pooling in an EJB Container State the Benefits of Passivation in an EJB container Explain How the Enterprise JavaBeans Container Does Life Cycle Management and Has the Capability to Increase Scalability Two-Minute Drill Self Test
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7.02 7.03
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7.09 7.10 7.11
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7.04 7.05 7.06
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7: Enterprise JavaBeans and the EJB Container Model
he Enterprise JavaBeans (EJB) specification is an industry initiative led and driven by Sun Microsystems with participation from many supporting vendors in the industry. Sun owns the process of defining, creating, and publishing the specification while ensuring the incorporation of input and feedback from the industry and the general public. The EJB requirements enable communication with Java Platform Enterprise Edition (JEE) clients including JavaServer Pages (JSP), servlets, and application clients as well as with EJBs in other EJB containers. The goal of these features is to allow EJB invocations to work even when client components and EJBs are deployed in Java Platform EE products from different vendors. Support for interoperability among components includes transaction propagation, naming services, and security services. The term enterprise implies that an application will be scalable, available, reliable, secure, transactional, and distributed. To provide these types of features, an enterprise application requires access to a variety of infrastructure services, such as distributed communication services, naming and directory services, transaction services, messaging services, data access and persistence services, and resourcesharing services. When a distributed framework is used, a client makes a call to what appears to be the interface of a business object. What it actually calls, however, is a stub that mimics the interface of that business object. This layer between clients and business objects is added because it is more practical to place stubs in the remote and distributed locations of clients than to place complete copies in the location of business objects. In a distributed framework, the client calls a business method on a stub as if it were the real object. The stub then communicates this request to a tie. The tie calls the method on the real business object. A result is returned to the stub and the client (see Figure 7-1). The Java Platform EE application programming interfaces (API) provide common interfaces that supply easy access to these underlying infrastructure services,
FIGURE 7-1
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