Redis: class java.lang.String cannot be cast to class java.util.List in #Cacheable method - spring

Question

I need to add a Redis cache in a method that returns a list of values.
I'm using this tutorial as basis https://www.baeldung.com/spring-data-redis-tutorial
The exception shows this
java.lang.ClassCastException: class java.lang.String cannot be cast to class java.util.List (java.lang.String and java.util.List are in module java.base of loader 'bootstrap')
at
#Cacheable(cacheNames = "customerDetailByParam", key="{#searchParams.toString()}")
#Retryable(value = { HttpServerErrorException.class }, maxAttempts = RETRY_ATTEMPTS, backoff = #Backoff(delay = 5000))
public List<ObjectResponse> searchCustomerDetailByParam(MultiValueMap<String, String> searchParams)
I've been looking for some solutions, however, none seems to work.
CacheConfig.java
#Configuration
#EnableCaching
#ConditionalOnMissingBean(value = CacheManager.class)
#Slf4j
public class CacheConfig {
#Bean
JedisConnectionFactory jedisConnectionFactory() {
RedisStandaloneConfiguration redisStandaloneConfiguration = new RedisStandaloneConfiguration("localhost", 6379);
//redisStandaloneConfiguration.setPassword(RedisPassword.of("yourRedisPasswordIfAny"));
return new JedisConnectionFactory(redisStandaloneConfiguration);
}
#Bean
public RedisTemplate<String, Object> redisTemplate() {
final RedisTemplate<String, Object> template = new RedisTemplate<String, Object>();
template.setConnectionFactory(jedisConnectionFactory());
template.setValueSerializer(new GenericToStringSerializer<Object>(Object.class));
template.setHashValueSerializer(new Jackson2JsonRedisSerializer<>(Object.class));
RedisSerializer<Object> serializer = new JdkSerializationRedisSerializer(getClass().getClassLoader());
template.setDefaultSerializer(serializer);
return template;
}
}
ObjectResponse.java
#Data
#NoArgsConstructor
#AllArgsConstructor
public class ObjectResponse implements Serializable {
#JsonProperty("id")
private String customerId;
#JsonProperty("name")
#JsonAlias("full_name")
private String customerName;
private String document;
private String email;
}

Answer 1

I was able to fix the problem changing the template to the following configuration.
#Bean
public RedisTemplate<String, Object> redisTemplate() {
final RedisTemplate<String, Object> template = new RedisTemplate<String, Object>();
template.setKeySerializer(new StringRedisSerializer());
template.setHashKeySerializer(new StringRedisSerializer());
template.setValueSerializer(new GenericJackson2JsonRedisSerializer());
template.setConnectionFactory(jedisConnectionFactory());
return template;
}