Server side JSR 303 validation issues

Hi,

I get following error on throwing ConstraintViolationException from following server code.

        Validator jsr303Validator = Validation.buildDefaultValidatorFactory().getValidator();
        Set<ConstraintViolation<UserDto>> violations = jsr303Validator.validate(userDto);
        if (!violations.isEmpty()) {
            Set<ConstraintViolation<?>> violationSet = new HashSet<ConstraintViolation<?>>(violations);
            throw new ConstraintViolationException(violationSet);
        }

com.google.gwt.user.client.rpc.SerializationException: Type 'java.util.HashSet' was not included in the set of types which can be serialized by this SerializationPolicy or its Class object could not be loaded. For security purposes, this type will not be serialized.: instance = [ConstraintViolationImpl{interpolatedMessage='Invalid user name.', propertyPath=name, rootBeanClass=class c.b.a.SomeClass, messageTemplate='Invalid user name.'}

HashSet can certainly be serialized as I can throw exception with HashSet<String> but throwing exception with HashSet<ConstraintViolation<?>> is not working! Any help is appreciated. I'm using GWT 2.5.1

Thanks.

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