Component classes generally transfer the task of generating output to the renderer. All JSF components follow it. Render kit is a set of related renderers. javax.faces.render.RenderKit is the class which represents the render kit. The default render kit contains renderers for html but it’s up to you to make it for other markup languages. Render kit can implement a skin (a look & feel). Render kit can target a specific device like phone, PC or markup language like HTML, WML, SVG. This is one of the best benefit of JSF because JSF doesn't limit to any device or markup.
he series of steps followed by an application is called its life cycle. A JSF application typically follows six steps in its life.
1. Restore view phase
2. Apply request values phase
3. Process validations phase
4. Update model values phase
5. Invoke application phase
6. Render response phase
JSF application typically uses JSP pages to represent views. JSF provides useful special tags to enhance these views. Each tag gives rise to an associated component. JSF (Sun Implementation) provides 43 tags in two standard JSF tag libraries: 1. JSF Core Tags Library 2. JSF Html Tags Library Even a very simple page uses tags from both libraries. These tags can be used adding the following lines of code at the head of the page. <%@ taglib uri=”http://java.sun.com/jsf/core “ prefix=”f” %> (For Core Tags) <%@ taglib uri=”http://java.sun.com/jsf/html “ prefix=”h” %> (For Html Tags)
JSP simply provides a Page which may contain markup, embedded Java code, and tags which encapsulate more complicated logic / html. JSF may use JSP as its template, but provides much more. This includes validation, rich component model and lifecycle, more sophisticated EL, separation of data, navigation handling, different view technologies (instead of JSP), ability to provide more advanced features such as AJAX, etc.
A mechanism for validating the data a user inputs to a JavaServer Faces UI component.
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