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One challenge in writing a book on advanced application development for the Java platform is to find a project small enough to write about, while at the same time, complex enough to warrant advanced programming techniques. The project presented in this book is a web-based auction house. The application is initially written for the Enterprise JavaBeans platform. Later chapters expand the core example described here by adding advanced functionality, improvements, and alternative solutions to do some of the things you get for free when you use the Enterprise JavaBeans platform. To keep the discussion simple, the example application has only a basic set of transactions for posting and bidding on auction items. However, the application scales to handle multiple users, provides a three-tiered transaction-based environment, controls security, and integrates legacy-based systems. This chapter covers how to determine project requirements and model the application—important steps that should always come before coding begins.
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