"vladimir.kovalyuk" wrote : It seems that simple validation (related to entity itself) is completely covered by Seam, except custom hibernate validators. | AFAIK hibernate validator is supposed to work without hibernate itself, for instance it should work with Kodo. | | Complex validation (how entity correlates to the other entities, rules and policies) are not covered at all. | Since Seam already employs JBoss Rules for authorization I believe it's possible to perform complex validation using Rules as well. The only thing I'm concerned about is performance. +1 View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4013900#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...