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PowerBuilder® 9: Internet and Distributed Application Development by John D. Olson, Bill Green

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Enterprise JavaBeans Overview

The Enterprise JavaBeans (EJB) framework (see Figure 23.1) is an initiative spearheaded by Sun Microsystems, Inc., with the input of a number of partner companies, including Sybase. Nearing its 2.1 release at the time of this writing, the EJB specification details the requirements and relationships of various roles involved in developing and deploying an application. Of specific interest to us in this chapter is the role of the Application Assembler, which is responsible for aggregating enterprise beans into a larger application according to the rules set forth in the client view contract. This contract dictates the interfaces that a client application uses to consume the services of enterprise beans, without knowledge ...

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