[bv-dev] Validation of constructor constraints

[Michael Nascimento]

There is method overriding, but no constructor overriding. Therefore,
it seems perfectly fine for me.

Regards,
Michael

On Sat, Jun 30, 2012 at 4:41 AM, Hardy Ferentschik <hardy at hibernate.org> wrote:
> Hi everyone,
>
> I hope you had some time to experiment with the functionality in Hibernate Validator 5.0.0.Alpha1.
> One question Gunnar and I discussed when implementing the latest spec was constructor validation and constraints on super types.
>
> Probably best to use an example:
>
>
>        public class Foo {
>                Foo(@Length(max = 10) String s) {
>                }
>
>                Foo(@Min(5) Integer i) {
>                }
>
>                public void foobar(@NotNull String s) {
>                        // ...
>                }
>        }
>
>        public class Bar extends Foo {
>                public Bar(String s) {
>                        super( s );
>                }
>
>                public void foobar(String s) {
>                        // ...
>                }
>        }
>
> In this case we have Bar extending Foo. What happens if Bar#foobar is called? In this case the @NotNull constraint from
> Foo#foobar get applied. So far so good. The question is what happens with constructor validation?
>
> In the example Bar has one constructor which defines no constraint. The matching super type constructor Foo(String) defines
> an @Length constraint. Should this constraint be applied? In the example Bar(String) calls the corresponding string constructor
> in the super type, but it might as well call the integer constructor. There is no telling from a Bean Validation point of view.
>
> For this reason Hibernate Validator does not apply any super types constraints when validating constructors. We think that is
> the right behavior, but wanted to run this by everyone. Either way it is probably worth to clarify the spec around this.
>
> Thoughts?
>
> --Hardy
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