System.out.println("existingContributorIDInternal: " + existingContributor.getIdInternal() + " socialSecurityNumber: " + socialSecurityNumber);
    public void setSocialSecurityNumber(String socialSecurityNumber) {	if (!StringUtils.isEmpty(socialSecurityNumber)) {	    final Party existingContributor = Party.readByContributorNumber(socialSecurityNumber);	    if (existingContributor != null && existingContributor != this) {		throw new DomainException("PERSON.createContributor.existing.contributor.number");	    }	    super.setSocialSecurityNumber(socialSecurityNumber);	}    }