code: private void initializeMapper() {
      if (itemClass == null) {
        itemMapper = CatchAllMapper.getInstance();
      } else {
        try {
          itemMapper = MapperFactory.getInstance().getMapper(itemClass);
        } catch (NoSuitableMapperException exp) {
          itemMapper = CatchAllMapper.getInstance();
        }
      }
    }
docs: Initializes the mapper for items in the List.