Writing Session Bean Web Services CHAPTER 5 One (Business web site)
Friday, December 21st, 2007Writing Session Bean Web Services CHAPTER 5 One of the most important enhancements of EJB 2.1 over its predecessors is the support it offers for Web Services. Web Services are a way to build and integrate large-scale systems within and between companies by sending XML messages to well-defined, modular interfaces. In this chapter, we will discuss central Web Services concepts and then explain how EJB supports the writing of Web Service implementations and Web Services clients. We will show how EJB enables you to build Web Services from stateless session beans and take a closer look at the Java API for XML- based RPC (JAX-RPC) that enables you to access Web Services from Java clients. Web Services Concepts Let s take a quick look again at some fundamental concepts. As mentioned in Chapter 1, Web Services are a way of building a Service-Oriented Architecture (SOA). SOA is an architectural approach to structuring large-scale, distributed applications that integrate heterogeneous applications behind service interfaces. Figure 5.1 shows the basic model of a lookup in a service-oriented architecture as supported by Web Services technologies.
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