무수한 에러를 만났다. 첫 부분만 보면, org.springframework.data.redis.serializer.SerializationException: Cannot serializeCaused by: org.springframework.core.serializer.support.SerializationFailedException: Failed to serialize object using DefaultSerializerCaused by: java.lang.IllegalArgumentException: DefaultSerializer requires a Serializable payload but received an object of type [ex.ops.hash.HashClass]Failed..
