Spring data redis returns null on deserializing List type - redis

Question

I am using spring data redis and one of my entity has a list as below.
#RedisHash("person")
#Data
#Builder
public class Person implements Serializable {
#Id
private String name;
private List<Address> addressList;
}
public class Address implements Serializable {
private String postCode;
private String country;
}
The serialisation works fine and the address is stored as
HGETALL person:123456
"name"
"blabla"
"address[0].postCode"
"1111XX"
"address[1].country"
"IN"
but while getting the person back the List is always null ? could someone point out what I am doing wrong here.
My Redis configuration looks as below.
#Configuration
#EnableRedisRepositories
public class RedisConfiguration {
#Bean
public JedisConnectionFactory jedisConnectionFactory() {
return new JedisConnectionFactory();
}
#Bean
public RedisTemplate<String, String> redisTemplate() {
final RedisTemplate<String, String> template = new RedisTemplate<>();
RedisSerializer<String> redisSerializer = new StringRedisSerializer();
Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<>(Object.class);
ObjectMapper mapper = new ObjectMapper();
mapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
mapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
mapper.findAndRegisterModules();
template.setKeySerializer(redisSerializer);
template.setValueSerializer(jackson2JsonRedisSerializer);
template.setHashValueSerializer(jackson2JsonRedisSerializer);
template.setConnectionFactory(jedisConnectionFactory());
return template;
}
}

Answer 1

I have some suspicion but can you share a bit more code snippet on how you use redisTemplate to save the data into redis?
But most likely its because you set up both Key and Values initialization of RedisTemplate
RedisTemplate<K, V> as <String, String>
Which is why even with Jackson2JsonSerializer it can't serialize and deserialize the List<Address> class properly.
A possible solution would be:
#Bean
public RedisTemplate<String, Person> redisTemplate(JedisConnectionFactory jedisConnectionFactory) {
RedisTemplate<String, Person> redisTemplate = new RedisTemplate<>();
redisTemplate.setConnectionFactory(jedisConnectionFactory);
redisTemplate.setKeySerializer(new StringRedisSerializer());
redisTemplate.setValueSerializer(new GenericJackson2JsonRedisSerializer());
return redisTemplate;
}
And then you store the whole Person object into Redis
When you need it then you get the whole object out and implement your getter and setter.
Hope this helps