http://facestutorials.icefaces.org/tutorial/validators-tutorial.html
icefaces jsf validate
This tutorial will also discuss the four forms of Validation:
?Built-In Validation
?Application Level Validation
?Custom Validation
?Validation Methods in Backing Beans
As well as sections on:
?Messages
?PartialSubmit
PartialSubmit will improve user feeling.
though written in 2006,very helpful,different ways to validate.