code: static Map<String, Object> simplePayload(final String name) {
  		if (name == null) {
  			return null;
  		}
  		Map<String, Object> payload = new LinkedHashMap<>();
  		payload.put("message", MSG_PREFIX + name);
  		return payload;
  	}
docs: Creates a new map representing a simple validation constraint.
  @param name the name of the constraint
  @return a map