return null;
    }
  }

  static class FactoryMethodAcceptsNull {

    final String name;

    private FactoryMethodAcceptsNull(String name) {
      this.name = name;
    }

    static FactoryMethodAcceptsNull create(@Nullable String name) {
      return new FactoryMethodAcceptsNull(name);
    }
  }

  static class FactoryMethodDoesNotAcceptNull {