Bean Validation applied on interface type

Question

The question is very short:

Let's consider there is the following class:

public class someClass implements someInterface {
    @NotNull
    String someString;

    // ... some cool logic, getters, setters, etc.
}

And this interface:

public interface SomeInterface {
    // cool stuff
}

Somewhere else is this method:

public <T extends SomeInterface> T doStuff (T someInterface) {
    Validator validator = Validation.buildDefaultValidatorFactory().getValidator();
    Set<ConstraintViolation<T>> violatons = validator.validate();
    // ...
    // ...
    // ...
    return someInterface;
}

I don't have much experience with BV. Will someString in SomeClass be validated or do I need to cast someInterface to SomeClass explicitly?

The scenario here is simplified. In reality I have different generic Classes and interfaces and it would mean a little bit of work. That's why I'm asking carefully.

Hope there's one of those experts hangin around!

Thanks in advance!

Answer 1

Bean Validation will obtain the constraints from the actual type of the validated instance, i.e. you can pass a variable of the interface type and Bean Validation will consider the constraints from the implementation (constraints declared on super-types and interfaces apply as well).