use kotlinx.serialization instead of ObjectMapper in kafka consumer

src/main/kotlin/com/example/demo/config/KafkaConsumerConfig.kt

@@ -2,7 +2,6 @@ package com.example.demo.config
 
 import com.example.demo.services.database.city.CityService
 import com.example.demo.services.kafka.Consumer
-import com.fasterxml.jackson.databind.ObjectMapper
 import org.apache.kafka.clients.consumer.ConsumerConfig
 import org.apache.kafka.common.serialization.StringDeserializer
 import org.springframework.beans.factory.annotation.Autowired
@@ -23,10 +22,8 @@ class KafkaConsumerConfig(
     @Bean
     fun consumer(
         @Autowired cityService: CityService,
-        @Autowired objectMapper: ObjectMapper,
     ): Consumer = Consumer(
         cityService = cityService,
-        objectMapper = objectMapper,
     )
 
     @Bean

src/main/kotlin/com/example/demo/services/kafka/Consumer.kt

@@ -2,7 +2,7 @@ package com.example.demo.services.kafka
 
 import com.example.demo.services.database.city.CityService
 import com.example.demo.services.kafka.dto.CityCreateDto
-import com.fasterxml.jackson.databind.ObjectMapper
+import kotlinx.serialization.json.Json
 import org.springframework.kafka.annotation.KafkaListener
 import org.springframework.messaging.handler.annotation.Payload
 import org.springframework.stereotype.Component
@@ -10,14 +10,13 @@ import org.springframework.stereotype.Component
 @Component
 class Consumer(
     private val cityService: CityService,
-    private val objectMapper: ObjectMapper
 ) {
     @KafkaListener(
         topics = ["#{'\${kafka.consumer.topics}'.split(',')}"],
         autoStartup = "\${kafka.consumer.auto-startup:false}",
     )
     fun handleCityCreate(@Payload message: String) {
-        val cityCreateDto = objectMapper.readValue(message, CityCreateDto::class.java)
+        val cityCreateDto = Json.decodeFromString<CityCreateDto>(message)
         cityService.create(cityCreateDto)
     }
 }

src/main/kotlin/com/example/demo/services/kafka/dto/CityCreateDto.kt

@@ -1,16 +1,12 @@
 package com.example.demo.services.kafka.dto
 
-import com.fasterxml.jackson.annotation.JsonProperty
+import kotlinx.serialization.Serializable
 
+@Serializable
 data class CityCreateDto (
-    @JsonProperty("guid")
     val guid: String,
-    @JsonProperty("name")
     val name: String,
-    @JsonProperty("createdAt")
     val createdAt: String,
-    @JsonProperty("updatedAt")
     val updatedAt: String?,
-    @JsonProperty("deletedAt")
     val deletedAt: String?,
 )