JavaServer Faces technology is a user interface framework for building web applications. The main components of JavaServer Faces technology are as follows:
A GUI component framework.
A flexible model for rendering components in different kinds of HTML or different markup languages and technologies. A Renderer object generates the markup to render the component and converts the data stored in a model object to types that can be represented in a view.
A standard RenderKit for generating HTML/4.01 markup.
The following features support the GUI components:
Input validation
Event handling
Data conversion between model objects and components
Managed model object creation
Page navigation configuration
All this functionality is available using standard Java APIs and XML-based configuration files.