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From Sylvain Vieujot <svieu...@apache.org>
Subject Re: hibernate validator
Date Mon, 13 Mar 2006 14:35:52 GMT
I agree, it would be very nice and avoid double validation code for the
hibernate users.
It would also prevent meaning less errors for the users and show the
exact problem.

Great idea !

Sylvain.

On Sat, 2006-03-11 at 17:45 +0100, Jurgen Lust wrote:

> How about this approach?
> 
>      1. You annotate your model classes with Hibernate Validator
>         annotations, for example @Range(min=10, max=20)
>      2. You don't put any validators in the JSPs
>      3. You implement a custom PropertyResolverImpl that does the
>         following:
>              1. set the property
>              2. perform the validation with HibernateValidator on the
>                 property
>              3. if the value is invalid, set the property to its
>                 original value and throw an EvaluationException
>              4. The JSP is rendered with a FacesMessage next to the
>                 input, containing the Hibernate Validator error
>                 message.
> Advantages:
>       * All validation is in 1 place, the model class, where it
>         belongs
>       * Much cleaner JSP
> Disadvantages:
>       * You completely bypass the JSF process validations phase,
>         however, since the custom PropertyResolver would reset the
>         property to its old value when a validation error occurs, this
>         would not really be a problem.
> 
> This approach would not work at the moment, or at least until
> MYFACES-1157 is fixed.
> 
> Any ideas?
> 
> Jurgen
> 
> 
> 
> Jurgen Lust schreef: 
> 
> > Hi, 
> > 
> > I've been playing around with Hibernate Annotations a bit, and
> > noticed that there is also something like the Hibernate Validator:
> > http://www.hibernate.org/hib_docs/annotations/reference/en/html/validator.html 
> > 
> > This allows you to specify constraints on your model classes, using
> > jdk 5.0 annotations. Hibernate then automatically enforces these
> > contraints in the persistence tier of your application. 
> > 
> > Now I was thinking that this could also be used with JSF. Instead of
> > putting all the JSF validation stuff in the JSPs, you should be able
> > to use those annotations  in the validate phase. 
> > Has anyone tried this yet? Would it be possible, and are there any
> > pitfalls? 
> > 
> > regards, 
> > 
> > Jurgen 
> 
> 

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