Form Validation with JSR 303

Hi,

i've some questions about form validation with JSR 303 and pojos within pojos.

I want to build a Form for a complex pojo which contains another pojo

public class MyPojo{
String a;
OtherPojo oPojo;
}

public class OtherPojo{
Date a;
Date b;
}

To build the Form we use a custom FormFieldFactory which returns another FormObject as a Field for Objects of the Type OtherPojo. So i have a Form with a BeanItem<MyPojo> set as the ItemDataSource. this form contains two Fields ( a TextField for the String "a" and a OtherPojoForm for the oPojo Field in MyPojo)

this works fine, but now I want to add a JSR303 validator to the OtherPojo class to ensure that a is befor b.

I'm using the beanvalidationform and the beanvalildationvalidator from the SpringApplication incubator project, which works fine for simple pojos and simlpe forms. But i cannot add a validator directly to a form because the addvalidator method in Form is implemented as "throw new UnsupportedoperationException" and the validator List in AbstractField is private so I can't add a validator to this List.

Does anyone know a way to add a Validator to a Form ?
Or another way to handle Pojos within pojos ?

Could you add a validator directly to the fields created by the OtherPojoForm? You could do this for example by adding a field factory to the form and adding the validators there.

yes i can add validators to these fields, but it wouldn't help. my validator needs access to both fields of the OtherPojoForm as it compares these values.

And I'm trying write a generic solution that works with all kinds of nested pojos/forms and beanvalidation.
the validator is implemented as a JSR303 compliant Validator with an Annotation. this Annotation is placed on the OtherPojo class an not on the OtherPojo Property in MyPojo. this way I can ensure that every use of OtherPojo will be validated through the validator.

Now I just reimplemented Form without the overridden method public void addValidator(Validator validator), so that it's possible to add a validator to a form.

I'm not sure why this method was disabled in the vaadin framework and if the reimplentation will rsult in some sideeffects

Just uploaded a presentation on Vaadin Beam Validator: http://www.youtube.com/watch?v=od61lfvWbn8