Validator validator = ValidatorUtil.getValidator();
Set<ConstraintViolation<Bar>> violations = validator.validate( new Bar() );
assertCorrectConstraintTypes( violations, NotNull.class );
ConstraintMapping mapping = config.createConstraintMapping();
mapping.type( Bar.class )
.property( "property", FIELD )
.ignoreAnnotations()
.constraint( new NullDef() );
config.addMapping( mapping );
validator = config.buildValidatorFactory().getValidator();