code: public static ModelConstants getInstance() throws KbRuntimeException {
      try {
        if (instance == null) {
          instance = new ModelConstants();
        }
        return instance;
      } catch (KbException e) {
        throw new KbRuntimeException(
            "Once of the private final fields in com.cyc.library.model.ModelConstants could not be instantiated, can not proceed further.",
            e);
      }
    }
docs: This is not part of the KB API