Exception during WebFlux tests: NoClassDefFoundError: KotlinModule$Builder Fixes #2114

Author: bnasslahsen

springdoc-openapi-starter-common/src/main/java/org/springdoc/core/configuration/SpringDocKotlinConfiguration.kt

@@ -44,7 +44,6 @@ open class SpringDocKotlinConfiguration(objectMapperProvider: ObjectMapperProvid
 			.addRequestWrapperToIgnore(Continuation::class.java)
 			.replaceWithSchema(ByteArray::class.java, ByteArraySchema())
 			.addDeprecatedType(Deprecated::class.java)
-		objectMapperProvider.jsonMapper().registerModule(KotlinModule.Builder().build())
 		objectMapperProvider.jsonMapper().registerModule(SpringDocRequiredModule())
 	}
 
@@ -99,4 +98,20 @@ open class SpringDocKotlinConfiguration(objectMapperProvider: ObjectMapperProvid
 		// See also kotlin.reflect.KCallable.getParameters
 		return kotlinFunction.parameters[parameterIndex + 1]
 	}
+
+	/**
+	 * SpringDoc Kotlin Module Configuration
+	 *
+	 * @param objectMapperProvider Object Mapper Provider
+	 * @return the nullable Kotlin Request Parameter Customizer
+	 */
+	@Lazy(false)
+	@Configuration(proxyBeanMethods = false)
+	@ConditionalOnClass(KotlinModule::class)
+	class SpringDocKotlinModuleConfiguration(objectMapperProvider: ObjectMapperProvider) {
+		init {
+			objectMapperProvider.jsonMapper()
+				.registerModule(KotlinModule.Builder().build())
+		}
+	}
 }