Introducing Java Page Flow Architecture | Developer.com
https://www.developer.com/design/introducing-java-page-flow-architecture/
WEBAug 31, 2005 · Page Flow Components. The different components of a Page Flow are as follows: Controllers. Form classes. Controllers. The Jpf.Controller annotation is the meat of a Page Flow. It’s just a file that contains Java code and annotations. The extension of this file is .jpf. As you saw in the previous example, a controller consists of several actions.
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