move validation config to root-level key

some refactoring

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

@@ -1,5 +1,7 @@
 package com.example.demo.config
 
+import com.example.demo.config.properties.KafkaProperties
+import com.example.demo.config.properties.ValidationProperties
 import com.example.demo.providers.CityRepository
 import com.example.demo.providers.MockedShopProvider
 import com.example.demo.providers.ProductRepository
@@ -24,7 +26,7 @@ import org.springframework.context.annotation.Bean
 import org.springframework.context.annotation.Configuration
 
 @Configuration
-@EnableConfigurationProperties(KafkaProperties::class)
+@EnableConfigurationProperties(KafkaProperties::class, ValidationProperties::class)
 class AppConfig(
     @Autowired private val kafkaProperties: KafkaProperties,
 ) {
@@ -54,7 +56,9 @@ class AppConfig(
     fun cityService(@Autowired cityRepository: CityRepository): CityService = CityServiceImpl(cityRepository)
 
     @Bean
-    fun schemaValidator(): SchemaValidator = SchemaValidatorImp(kafkaProperties.validation.schema)
+    fun schemaValidator(
+        @Autowired validationProperties: ValidationProperties,
+    ): SchemaValidator = SchemaValidatorImp(validationProperties.schema)
 
     @Bean
     fun otlpHttpSpanExporter(@Value("\${tracing.url}") url: String): OtlpHttpSpanExporter {

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

@@ -1,5 +1,6 @@
 package com.example.demo.config
 
+import com.example.demo.config.properties.KafkaProperties
 import com.example.demo.services.database.city.CityService
 import com.example.demo.services.kafka.Consumer
 import io.micrometer.core.instrument.MeterRegistry

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

@@ -1,5 +1,6 @@
 package com.example.demo.config
 
+import com.example.demo.config.properties.KafkaProperties
 import com.example.demo.services.kafka.Producer
 import com.example.demo.services.kafka.ProducerImpl
 import com.example.demo.services.validation.SchemaValidator

src/main/kotlin/com/example/demo/config/properties/KafkaProperties.kt

@@ -1,4 +1,4 @@
-package com.example.demo.config
+package com.example.demo.config.properties
 
 import org.springframework.boot.context.properties.ConfigurationProperties
 import org.springframework.boot.context.properties.bind.ConstructorBinding
@@ -8,7 +8,6 @@ data class KafkaProperties @ConstructorBinding constructor(
     val bootstrapServers: String,
     val producer: Producer,
     val consumer: Consumer,
-    val validation: Validation,
 ) {
     data class Producer(
         val product: Product,
@@ -24,8 +23,4 @@ data class KafkaProperties @ConstructorBinding constructor(
         val autoStartup: Boolean,
         val autoOffsetReset: String,
     )
-
-    data class Validation(
-        val schema: Map<String, String>
-    )
 }

src/main/kotlin/com/example/demo/config/properties/ValidationProperties.kt

@@ -0,0 +1,8 @@
+package com.example.demo.config.properties
+
+import org.springframework.boot.context.properties.ConfigurationProperties
+
+@ConfigurationProperties("validation")
+data class ValidationProperties(
+    val schema: Map<String, String>
+)

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

@@ -3,6 +3,7 @@ package com.example.demo.services.kafka
 import com.example.demo.models.Product
 import com.example.demo.services.kafka.dto.ProductDto
 import com.example.demo.services.validation.SchemaValidator
+import com.example.demo.services.validation.SchemaValidator.Companion.SCHEMA_KAFKA_PRODUCT_SYNC
 import kotlinx.serialization.json.Json
 import kotlinx.serialization.json.encodeToJsonElement
 import org.springframework.kafka.core.KafkaTemplate
@@ -20,7 +21,7 @@ class ProducerImpl(
 
         val serializedProduct = Json.encodeToJsonElement(ProductDto(product))
 
-        schemaValidator.validate("product-sync", serializedProduct)
+        schemaValidator.validate(SCHEMA_KAFKA_PRODUCT_SYNC, serializedProduct)
 
         val message: Message<String> = MessageBuilder
             .withPayload(serializedProduct.toString())

src/main/kotlin/com/example/demo/services/validation/SchemaValidator.kt

@@ -7,4 +7,8 @@ import kotlinx.serialization.json.JsonElement
 interface SchemaValidator {
     @Throws(ElementNotValidException::class, SchemaNotFoundException::class)
     fun validate(schemaName: String, value: JsonElement)
+
+    companion object {
+        const val SCHEMA_KAFKA_PRODUCT_SYNC = "kafka-product-sync"
+    }
 }

src/main/resources/application.yml

@@ -31,9 +31,10 @@ kafka:
     topics: demo-city-sync
     auto-offset-reset: none
     auto-startup: true
+
 validation:
   schema:
-      product-sync: product/sync.json
+    kafka-product-sync: kafka/product/sync.json
 
 springdoc:
   api-docs:

src/test/kotlin/com/example/demo/BaseUnitTest.kt

@@ -1,7 +1,9 @@
 package com.example.demo
 
-import com.example.demo.config.KafkaProperties
+import com.example.demo.config.properties.KafkaProperties
+import com.example.demo.config.properties.ValidationProperties
 import com.example.demo.services.kafka.Consumer
+import com.example.demo.services.validation.SchemaValidator.Companion.SCHEMA_KAFKA_PRODUCT_SYNC
 import org.springframework.boot.test.context.TestConfiguration
 import org.springframework.boot.test.mock.mockito.MockBean
 import org.springframework.context.annotation.Bean
@@ -26,9 +28,11 @@ open class BaseUnitTest {
                 autoStartup = false,
                 autoOffsetReset = "none",
             ),
-            validation = KafkaProperties.Validation(
-                schema = mapOf("product-sync" to "product/sync.json"),
-            ),
+        )
+
+        @Bean
+        fun validationProperties(): ValidationProperties = ValidationProperties(
+            schema = mapOf(SCHEMA_KAFKA_PRODUCT_SYNC to "kafka/product/sync.json"),
         )
     }
 }

src/test/kotlin/com/example/demo/services/validation/SchemaValidatorImpTest.kt

@@ -1,6 +1,7 @@
 package com.example.demo.services.validation
 
 import com.example.demo.BaseUnitTest
+import com.example.demo.services.validation.SchemaValidator.Companion.SCHEMA_KAFKA_PRODUCT_SYNC
 import com.example.demo.services.validation.exceptions.ElementNotValidException
 import com.example.demo.services.validation.exceptions.SchemaNotFoundException
 import kotlinx.serialization.json.Json
@@ -41,7 +42,7 @@ class SchemaValidatorImpTest(
         @JvmStatic
         fun validateDataProvider() = listOf(
             Arguments.of(
-                "product-sync",
+                SCHEMA_KAFKA_PRODUCT_SYNC,
                 """
                 {
                   "id": 123,
@@ -57,7 +58,7 @@ class SchemaValidatorImpTest(
                 null,
             ),
             Arguments.of( // no id
-                "product-sync",
+                SCHEMA_KAFKA_PRODUCT_SYNC,
                 """
                 {
                     "guid": "3a27e322-b5b6-427f-b761-a02284c1cfa4",
@@ -72,7 +73,7 @@ class SchemaValidatorImpTest(
                 ElementNotValidException::class,
             ),
             Arguments.of( // wrong guid
-                "product-sync",
+                SCHEMA_KAFKA_PRODUCT_SYNC,
                 """
                 {
                     "id": 213,