Java:RedisTemplate Hash 操作抛出异常的问题

Question

@Service class SomeService{ 
  private HashOperations<String, String, Integer> intHashOps;
  @Autowired
  private  RedisTemplate<String, String> redisTemplate;

  @PostConstruct
  void init(){
   hashOps = redisTemplate.opsForHash();
  }

  void do(){
   intHashOps.put("aKey", "item", 1);   //抛出异常
  }
}

上面的代码中，调用 do()抛出异常 java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String 这是怎么回事啊？