I agree with Gavin.  I've always been ok with complex validation in the action 
method (or control flow).  If you need something a little more declarative, it 
shouldn't be too hard to use Seam plus EJB interceptors to write your thin 
framework.

If you think about it this is what JSF is doing anyway with its phased approach 
to conversion and validation.  Being able to use EJB 3 allows you to slip in 
your own layer immediately preceeding action invocation.  You'd then be able to 
apply any declarative application concerns, including validation, on objects 
that had already been converted and validated in isolation.

Would it help if Seam provided a "standard" annotation that highlights this 
ability or should users just implement something like this on their own?  I 
guess if this feature is being requested, giving the masses what they want may 
have some value, even if it's just providing a utility that they could provide 
themselves.  Utility is a good thing. 

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