String getNullParamMessage(String paramName) {
      if (message != null) return message;
      String shortName = getAnnoShortName(notNullAnno);
      if (paramName != null) return "Argument for @" + shortName + " parameter '%s' of %s.%s must not be null";
      return "Argument %s for @" + shortName + " parameter of %s.%s must not be null";
    }
String getNullParamMessage(String paramName)