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Java Server Faces (hereafter JSF) is an event based development framework in Java EE5 arena. It is a framework for building user interfaces for Web application.
JavaServer Faces JSF uses the existing user interface and Web tier mechanisms but it does not tie up the applications to a particular mark-up language, protocol and client device. It encapsulates various UI component functionality enabling it render data to various client devices by developing required custom tags. JavaServer Faces technology provides a custom renderer and a JSP custom tag library for rendering to an HTML client, allowing developers of Java EE applications to use JavaServer Faces technology in their applications.

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• Helps to reduce duplication in the code
• Maintenance of the existing code becomes easier
• Provides a central place to control all the user views- Controller
• Any new user view can be added and later wired to the controller
• Debugging the application becomes quite easier
• Changes to the Model have a minimal effect on View and Controller

Coming back to JSF now, JavaServer Faces JSF technology clearly separates presentation logic from the application logic. Several development roles can be created and designated during the application development state. The JSF technology is developed through Java Community Process under JSR-127.

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This completes what gives the basic idea on architectural design of Java Server Faces JSF and the various components available with Java Server Faces.

JavaServer Faces JSF technology provides

• APIs for representing user interface components and managing their state, handling events triggered on them, validating inputs entered by user, defining page navigation, supporting internationalization and accessibility.

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