RedisTemplate Hash 操作抛出异常的问题

@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("loginFailCount", username, 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？