can NOT store non-string Object when using StringRedisSerializer for HashValueSerializer

Question

I faced the ClassCastException exception when using the StringRedisSerializer to store hash value. if if remove the non-string field 'age', then it can be stored into redis.

 Demo demo = new Demo();
 demo.setName("DemoCache_jsonSerializer");
 // non-string field
 demo.setAge(111);
 // set stringSerializer
 redisTemplate.setHashValueSerializer(new StringRedisSerializer());
 //exception here: java.lang.Integer cannot be cast to java.lang.String
 redisTemplate.opsForHash().putAll("testKey",
 mapper.toHash(demo));

I know if I change to jsonserializer it will work, but my question is how to keep it work with the StringRedisSerializer ,and able to store object that has non-string fields

Answer 1

Using StringRedisSerializer you can only convert String to byte[] and byte[] to String. To keep it working with StringRedisSerializer better convert all the object to String maybe override toString(). But I guess this might be a bad design.

Have a look at the below links : Source Code and Documentation you might find something helpful.

• Santosh Joshi: @MunimMunna, I somehow missed this. Thanks for pointing out. Will be careful next time.

Answer 2

 @Bean
public RedisTemplate<String, Object> redisTemplate() {
 final RedisTemplate<String, Object> template = new RedisTemplate<String, Object>();
 template.setConnectionFactory(jedisConnectionFactory());
 template.setKeySerializer(new StringRedisSerializer());
 template.setValueSerializer(new Jackson2JsonRedisSerializer<>(Object.class));
 template.afterPropertiesSet();
 return template; }