jersey 2 constraintvalidator called twice - validation

Question

Using Jersy 2 on Glassfish 4.
I have a custom ConstraintValidator that is being called to validate a bean parameter.
The ConstraintValidator is correctly injected with Jersey resources using #Context. (Changed #Context to #Inject to solve problem with resources being null when ConstraintValidator is called twice by the system.)
Problem the isValid() method is called twice I can see the logging being printed twice before the update() method is being called.
I added an interceptor to do some debug logging.
First the constraintvalidator.isValid() is called then my Interceptor then constraintvalidator.isValid() is called again and then only my REST resource method.
(This class does not contain any injected resources.)
public class StudyValidator implements ConstraintValidator<StudyCheck, StudyBeanREST> {
private static final Logger log = Logger.getLogger(StudyValidator.class);
#Override
public void initialize(StudyCheck constraintAnnotation) {
}
#Override
public boolean isValid(StudyBeanREST study, ConstraintValidatorContext context) {
log.info("Validating study: " + study);
Integer version = study.getVersion();
if(version == null || version < 0) {
return false;
}
return true;
}
}
The annotation:
#Target({ElementType.PARAMETER,ElementType.METHOD})
#Retention(RetentionPolicy.RUNTIME)
#Constraint(validatedBy = {StudyValidator.class})
public #interface StudyCheck {
String message() default "{error.version}";
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
}
And where I use my annotation:
#PUT
#RolesAllowed({"management"})
public StudyBeanREST update(#StudyCheck StudyBeanREST study) throws RecordNotFoundException, UpdateNotAllowedException {
Study updated = studyEJB.update(study.getJpa());
study.setJpa(updated);
return study;
}