code: protected final List<?> listref(Class<?>... classes) {
      List<Object> items = CollectUtils.newArrayList(classes.length);
      for (Class<?> clazz : classes) {
        items.add(new ReferenceValue(clazz.getName()));
      }
      return items;
    }
docs: Generate a list reference property
  <p>
  
  @param classes