Missing type id when trying to resolve subtype of [simple type, class java.lang.Object]: missing type id property '@class'

I am storing my object as json in redis cache using the GenericJackson2JsonRedisSerializer()

But my issue is when I try to update the object within the cache I get the following error

Caused by: com.fasterxml.jackson.databind.exc.InvalidTypeIdException: Missing type id when trying to resolve subtype of [simple type, class java.lang.Object]: missing type id property '@class'
 at [Source: (byte[])"{"id":"10.36.55.1","protocolRestriction":false}"; line: 1, column: 47]

I have already tried adding the following to my object.

@JsonTypeInfo(
        use = JsonTypeInfo.Id.MINIMAL_CLASS,
        include = JsonTypeInfo.As.PROPERTY,
        property = "@class")

but with no luck.

Here is my config,

 @Bean
    fun redisCacheManager(objectMapper: ObjectMapper): CacheManager {
        objectMapper.registerModule(KotlinModule())
        objectMapper.enableDefaultTypingAsProperty(ObjectMapper.DefaultTyping.NON_FINAL, "@class")

        val jsonSerializer = RedisSerializationContext.SerializationPair
                .fromSerializer(GenericJackson2JsonRedisSerializer(objectMapper))

        return RedisCacheManager.RedisCacheManagerBuilder
                .fromConnectionFactory(jedisConnectionFactory())
                .cacheDefaults(
                        RedisCacheConfiguration.defaultCacheConfig()
                                .entryTtl(Duration.ofMinutes(cacheTimeToLive!!))
                                .serializeValuesWith(jsonSerializer))
                .build()
    }

this is my object

@RedisHash("sessionState", timeToLive = 900) //evict after 15min
data class SessionState(@Id val id:String?,
                        val protocolRestriction: Boolean?): Serializable

Here is how i am updating my object in the cache

   @Caching(put = [CachePut("sessionStateCache", key = "#sessionState.id", unless = "#result == null")],
            evict = [CacheEvict("allSessionStateCache", allEntries = true)])
    override fun updateSessionState(sessionState: SessionState): SessionState {
        return sessionStateRepo.save(sessionState)
    }

Any help would be much appreciated.