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2.4. Presentation layer validation
When working with JSF and JBoss Seam , one can triggers the validation process at the presentation layer using Seam's JSF tags
<s:validate>
and <s:validateAll/>
, letting the constraints be expressed on the model, and the violations presented in the view
Going even further, and adding Ajax4JSF to the loop will bring client side validation with just a couple of additional JSF tags, again without validation definition duplication.
Check the JBoss Seam documentation for more information.