Redis sets the object as empty json "{}" while using Spring Boot

Question

I'm trying to set an object on redis. RedisTemplate configuration is shown below.

@Bean
fun redisTemplate(): RedisTemplate<String, Any> {
    val redisTemplate = RedisTemplate<String, Any>()
    redisTemplate.connectionFactory = jedisConnectionFactory()
    redisTemplate.defaultSerializer = GenericJackson2JsonRedisSerializer()
    redisTemplate.keySerializer = StringRedisSerializer()
    redisTemplate.hashKeySerializer = GenericJackson2JsonRedisSerializer()
    redisTemplate.valueSerializer = GenericJackson2JsonRedisSerializer()

    redisTemplate.afterPropertiesSet()
    return redisTemplate
}

here is my setting line

redisUtil.redisTemplate().opsForValue().set("CATEGORIES", tree)

and the result is

127.0.0.1:6379> keys *
1) "CATEGORIES"
127.0.0.1:6379> GET CATEGORIES
"{}"
127.0.0.1:6379>

madcolonel10 · Accepted Answer · 2019-04-10 19:09:49Z

2

+50

If you want to store an object you can use hash

Pet pet = new Pet();
pet.setHeight(10);
pet.setName("tommy");

ObjectMapper oMapper = new ObjectMapper();

template.opsForHash().putAll("pet", oMapper.convertValue(pet, Map.class));

Pet pet1 = oMapper.convertValue(template.opsForHash().entries("pet"), Pet.class);
System.out.println(pet1.getName());
System.out.println(pet1.getHeight());
System.out.println(pet1.getWeight());

RedisTemplate configuration

@Bean
public RedisTemplate<String, Object> redisTemplate() {
RedisTemplate<String, Object> template = new RedisTemplate<>();
template.setKeySerializer(new StringRedisSerializer());
template.setValueSerializer(new GenericJackson2JsonRedisSerializer());
template.setHashKeySerializer(new StringRedisSerializer());
template.setHashValueSerializer(new GenericJackson2JsonRedisSerializer());
template.setConnectionFactory(jedisConnectionFactory());
template.setEnableTransactionSupport(true);
return template;
}

If you want to store it as a key value pair

Pet pet = new Pet();
pet.setHeight(10);
pet.setName("tommy");

template.opsForValue().set("pettest", pet);
Pet pet2 = (Pet) template.opsForValue().get("pettest");
System.out.println("boo boo");
System.out.println(pet2.getName());

result of get pettest in redis {"@class":"com.cisco.rediscluster.Pet","name":"tommy","height":10}

edited Apr 10, 2019 at 19:09

answered Apr 10, 2019 at 18:36

madcolonel10

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2 Comments

Mustafa Güven Over a year ago

I can but should I?, I mean isn't there a way to store an object as whole rather than a part of map? If no, why?

madcolonel10 Over a year ago

the second part of my answer is storing the entire object, you just have to type cast it to the correct class when reading the data, in your case Tree

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