Implement Java annotations for validation

I want to call a Validator from org.hibernate.validator.internal.constraintvalidators. manually on a value because I can't annotate the class. What I've done is this :

LengthValidator validator = new LengthValidator();
validator.initialize(new Length() {
    @Override
    public Class<? extends Annotation> annotationType() {
        return null;
    }

    @Override
    public Class<? extends Payload>[] payload() {
        return null;
    }

    @Override
    public int min() {
        return min == null ? defaultMin : min;
    }

    @Override
    public String message() {
        return null;
    }

    @Override
    public int max() {
        return max == null ? defaultMax : max;
    }

    @Override
    public Class<?>[] groups() {
        return null;
    }
});
Boolean valid = validator.isValid(myValue.asText(), null));

But Sonar is not happy :

Lambdas and anonymous classes should not have too many lines

So I tried to refactor this code by implementing @Length in a custom class like this :

public class StringLength implements Length {
    // All the methods overriden from @Length
}

but the compiler complains

The annotation type Length should not be used as a superinterface for StringLength

How can I achieve what I want to do ?

---

Note that the use of internal classes is not encouraged, but if you really wanted to, you could use the Hibernate Validator AnnotationFactory :

  AnnotationDescriptor<Length> descriptor = new AnnotationDescriptor<Length>( Length.class );
  descriptor.setValue( "min", 0 );
  descriptor.setValue( "max", 10 );
  ...

  Length lengthAnnotation = AnnotationFactory.create( descriptor );

I am not quite sure though, what you gain using LengthValidator . You still cannot make use of the Validator framework, right? If you cannot annotate the class, can you not use XML configuration instead?

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