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Most Java applications, including web based ones, follow the 3-tier architecture. Although Java provides standard tools for tier-to-tier interfaces, the separation of the tiers is usually not perfect. E.g. the database interface, JDBC, assumes that SQL statements are issued from the application server. Similarly, in web based Java applications, HTML code is assumed to be produced by servlets. In terms of syntax, this turns Java source code into mixtures of languages: Java and SQL, Java and HTML. These language mixtures are difficult to read, modify, and maintain.
This project is to achieve a good separation of the 3 tiers. The technique is based on an explicit Interface and Data Definitions. This ensures isolation of the back-end, application server, and front-end development. The Definitions also enable application design in terms of aggregated data structures. Significant amounts of auxiliary code is generated from the Definitions, enabling the developers to work in convenient OOP
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