Serializable 오류(LocalDateTime, kotlin.serialization)

2024-10-16 21:37:31.808 [eventLoopGroupProxy-4-1] TRACE io.ktor.server.routing.Routing - Trace for [api, menu]
/, segment:0 -> SUCCESS @ /
  /json, segment:0 -> FAILURE "Selector didn't match" @ /json
  /, segment:0 -> SUCCESS @ /
    /(method:GET), segment:0 -> FAILURE "Not all segments matched" @ /(method:GET)
  /api, segment:1 -> SUCCESS @ /api
    /api/menus, segment:1 -> FAILURE "Selector didn't match" @ /api/menus
Matched routes:
  No results
Routing resolve result:
  FAILURE "No matched subtrees found" @ /
2024-10-16 21:37:31.814 [eventLoopGroupProxy-4-1] TRACE i.k.s.p.c.ContentNegotiation - Skipping response body transformation from HttpStatusCode to OutgoingContent for the GET /api/menu request because the HttpStatusCode type is ignored. See [ContentNegotiationConfig::ignoreType].
2024-10-16 21:37:34.746 [eventLoopGroupProxy-4-2] TRACE io.ktor.server.routing.Routing - Trace for [api, menus]
/, segment:0 -> SUCCESS @ /
  /json, segment:0 -> FAILURE "Selector didn't match" @ /json
  /, segment:0 -> SUCCESS @ /
    /(method:GET), segment:0 -> FAILURE "Not all segments matched" @ /(method:GET)
  /api, segment:1 -> SUCCESS @ /api
    /api/menus, segment:2 -> SUCCESS @ /api/menus
      /api/menus/(method:GET), segment:2 -> SUCCESS @ /api/menus/(method:GET)
Matched routes:
  "" -> "api" -> "menus" -> "(method:GET)"
Routing resolve result:
  SUCCESS @ /api/menus/(method:GET)
2024-10-16 21:37:34.818 [eventLoopGroupProxy-4-2] ERROR Application - Unhandled: GET - /api/menus
kotlinx.serialization.SerializationException: Serializer for class 'CafeMenu' is not found.
Please ensure that class is marked as '@Serializable' and that the serialization compiler plugin is applied.

	at kotlinx.serialization.internal.Platform_commonKt.serializerNotRegistered(Platform.common.kt:90)
	at kotlinx.serialization.SerializersKt__SerializersKt.serializer(Serializers.kt:299)
	at kotlinx.serialization.SerializersKt.serializer(Unknown Source)
	at io.ktor.serialization.kotlinx.SerializerLookupKt.guessSerializer(SerializerLookup.kt:52)
	at io.ktor.serialization.kotlinx.SerializerLookupKt.elementSerializer(SerializerLookup.kt:59)
	at io.ktor.serialization.kotlinx.SerializerLookupKt.guessSerializer(SerializerLookup.kt:41)
	at io.ktor.serialization.kotlinx.KotlinxSerializationConverter.serialize(KotlinxSerializationConverter.kt:53)
	at io.ktor.server.plugins.contentnegotiation.ResponseConverterKt$convertResponseBody$1$2.invokeSuspend(ResponseConverter.kt:66)
	at io.ktor.server.plugins.contentnegotiation.ResponseConverterKt$convertResponseBody$1$2.invoke(ResponseConverter.kt)
	at io.ktor.server.plugins.contentnegotiation.ResponseConverterKt$convertResponseBody$1$2.invoke(ResponseConverter.kt)
	at io.ktor.server.application.OnCallRespondContext.transformBody(KtorCallContexts.kt:85)
	at io.ktor.server.plugins.contentnegotiation.ResponseConverterKt$convertResponseBody$1.invokeSuspend(ResponseConverter.kt:39)
	at io.ktor.server.plugins.contentnegotiation.ResponseConverterKt$convertResponseBody$1.invoke(ResponseConverter.kt)
	at io.ktor.server.plugins.contentnegotiation.ResponseConverterKt$convertResponseBody$1.invoke(ResponseConverter.kt)
	at io.ktor.server.application.PluginBuilder$onDefaultPhase$1.invokeSuspend(PluginBuilder.kt:217)
	at io.ktor.server.application.PluginBuilder$onDefaultPhase$1.invoke(PluginBuilder.kt)
	at io.ktor.server.application.PluginBuilder$onDefaultPhase$1.invoke(PluginBuilder.kt)
	at io.ktor.server.application.PluginBuilder$onDefaultPhaseWithMessage$1$1$1.invokeSuspend(PluginBuilder.kt:200)
	at io.ktor.server.application.PluginBuilder$onDefaultPhaseWithMessage$1$1$1.invoke(PluginBuilder.kt)
	at io.ktor.server.application.PluginBuilder$onDefaultPhaseWithMessage$1$1$1.invoke(PluginBuilder.kt)
	at io.ktor.util.debug.ContextUtilsKt.addToContextInDebugMode(ContextUtils.kt:30)
	at io.ktor.server.application.PluginBuilder$onDefaultPhaseWithMessage$1$1.invokeSuspend(PluginBuilder.kt:196)
	at io.ktor.server.application.PluginBuilder$onDefaultPhaseWithMessage$1$1.invoke(PluginBuilder.kt)
	at io.ktor.server.application.PluginBuilder$onDefaultPhaseWithMessage$1$1.invoke(PluginBuilder.kt)
	at io.ktor.util.pipeline.PipelineJvmKt.pipelineStartCoroutineUninterceptedOrReturn(PipelineJvm.kt:15)
	at io.ktor.util.pipeline.SuspendFunctionGun.loop(SuspendFunctionGun.kt:131)
	at io.ktor.util.pipeline.SuspendFunctionGun.proceed(SuspendFunctionGun.kt:89)
	at io.ktor.util.pipeline.SuspendFunctionGun.execute$ktor_utils(SuspendFunctionGun.kt:109)
	at io.ktor.util.pipeline.Pipeline.execute(Pipeline.kt:86)
	at io.ktor.server.application.PipelineCall$DefaultImpls.respond(PipelineCall.kt:106)
	at io.ktor.server.routing.RoutingPipelineCall.respond(RoutingPipelineCall.kt:20)
	at io.ktor.server.routing.RoutingCall.respond(RoutingNode.kt:229)
	at com.example.plugins.RoutingKt$configureRouting$1$2$1.invokeSuspend(Routing.kt:23)
	at com.example.plugins.RoutingKt$configureRouting$1$2$1.invoke(Routing.kt)
	at com.example.plugins.RoutingKt$configureRouting$1$2$1.invoke(Routing.kt)
	at io.ktor.server.routing.RoutingNode$buildPipeline$1$1.invokeSuspend(RoutingNode.kt:116)
	at io.ktor.server.routing.RoutingNode$buildPipeline$1$1.invoke(RoutingNode.kt)
	at io.ktor.server.routing.RoutingNode$buildPipeline$1$1.invoke(RoutingNode.kt)
	at io.ktor.util.pipeline.PipelineJvmKt.pipelineStartCoroutineUninterceptedOrReturn(PipelineJvm.kt:15)
	at io.ktor.util.pipeline.SuspendFunctionGun.loop(SuspendFunctionGun.kt:131)
	at io.ktor.util.pipeline.SuspendFunctionGun.proceed(SuspendFunctionGun.kt:89)
	at io.ktor.util.pipeline.SuspendFunctionGun.execute$ktor_utils(SuspendFunctionGun.kt:109)
	at io.ktor.util.pipeline.Pipeline.execute(Pipeline.kt:86)
	at io.ktor.server.routing.RoutingRoot$executeResult$$inlined$execute$1.invokeSuspend(Pipeline.kt:490)
	at io.ktor.server.routing.RoutingRoot$executeResult$$inlined$execute$1.invoke(Pipeline.kt)
	at io.ktor.server.routing.RoutingRoot$executeResult$$inlined$execute$1.invoke(Pipeline.kt)
	at io.ktor.util.debug.ContextUtilsKt.initContextInDebugMode(ContextUtils.kt:17)
	at io.ktor.server.routing.RoutingRoot.executeResult(RoutingRoot.kt:193)
	at io.ktor.server.routing.RoutingRoot.interceptor(RoutingRoot.kt:66)
	at io.ktor.server.routing.RoutingRoot$Plugin$install$1.invokeSuspend(RoutingRoot.kt:143)
	at io.ktor.server.routing.RoutingRoot$Plugin$install$1.invoke(RoutingRoot.kt)
	at io.ktor.server.routing.RoutingRoot$Plugin$install$1.invoke(RoutingRoot.kt)
	at io.ktor.util.pipeline.PipelineJvmKt.pipelineStartCoroutineUninterceptedOrReturn(PipelineJvm.kt:15)
	at io.ktor.util.pipeline.SuspendFunctionGun.loop(SuspendFunctionGun.kt:131)
	at io.ktor.util.pipeline.SuspendFunctionGun.proceed(SuspendFunctionGun.kt:89)
	at io.ktor.server.engine.BaseApplicationEngineKt$installDefaultTransformationChecker$1.invokeSuspend(BaseApplicationEngine.kt:112)
	at io.ktor.server.engine.BaseApplicationEngineKt$installDefaultTransformationChecker$1.invoke(BaseApplicationEngine.kt)
	at io.ktor.server.engine.BaseApplicationEngineKt$installDefaultTransformationChecker$1.invoke(BaseApplicationEngine.kt)
	at io.ktor.util.pipeline.PipelineJvmKt.pipelineStartCoroutineUninterceptedOrReturn(PipelineJvm.kt:15)
	at io.ktor.util.pipeline.SuspendFunctionGun.loop(SuspendFunctionGun.kt:131)
	at io.ktor.util.pipeline.SuspendFunctionGun.proceed(SuspendFunctionGun.kt:89)
	at io.ktor.util.pipeline.SuspendFunctionGun.execute$ktor_utils(SuspendFunctionGun.kt:109)
	at io.ktor.util.pipeline.Pipeline.execute(Pipeline.kt:86)
	at io.ktor.server.engine.DefaultEnginePipelineKt$defaultEnginePipeline$1$invokeSuspend$$inlined$execute$1.invokeSuspend(Pipeline.kt:490)
	at io.ktor.server.engine.DefaultEnginePipelineKt$defaultEnginePipeline$1$invokeSuspend$$inlined$execute$1.invoke(Pipeline.kt)
	at io.ktor.server.engine.DefaultEnginePipelineKt$defaultEnginePipeline$1$invokeSuspend$$inlined$execute$1.invoke(Pipeline.kt)
	at io.ktor.util.debug.ContextUtilsKt.initContextInDebugMode(ContextUtils.kt:17)
	at io.ktor.server.engine.DefaultEnginePipelineKt$defaultEnginePipeline$1.invokeSuspend(DefaultEnginePipeline.kt:123)
	at io.ktor.server.engine.DefaultEnginePipelineKt$defaultEnginePipeline$1.invoke(DefaultEnginePipeline.kt)
	at io.ktor.server.engine.DefaultEnginePipelineKt$defaultEnginePipeline$1.invoke(DefaultEnginePipeline.kt)
	at io.ktor.util.pipeline.PipelineJvmKt.pipelineStartCoroutineUninterceptedOrReturn(PipelineJvm.kt:15)
	at io.ktor.util.pipeline.SuspendFunctionGun.loop(SuspendFunctionGun.kt:131)
	at io.ktor.util.pipeline.SuspendFunctionGun.proceed(SuspendFunctionGun.kt:89)
	at io.ktor.util.pipeline.SuspendFunctionGun.execute$ktor_utils(SuspendFunctionGun.kt:109)
	at io.ktor.util.pipeline.Pipeline.execute(Pipeline.kt:86)
	at io.ktor.server.netty.NettyApplicationCallHandler$handleRequest$1$invokeSuspend$$inlined$execute$1.invokeSuspend(Pipeline.kt:490)
	at io.ktor.server.netty.NettyApplicationCallHandler$handleRequest$1$invokeSuspend$$inlined$execute$1.invoke(Pipeline.kt)
	at io.ktor.server.netty.NettyApplicationCallHandler$handleRequest$1$invokeSuspend$$inlined$execute$1.invoke(Pipeline.kt)
	at io.ktor.util.debug.ContextUtilsKt.initContextInDebugMode(ContextUtils.kt:17)
	at io.ktor.server.netty.NettyApplicationCallHandler$handleRequest$1.invokeSuspend(NettyApplicationCallHandler.kt:140)
	at io.ktor.server.netty.NettyApplicationCallHandler$handleRequest$1.invoke(NettyApplicationCallHandler.kt)
	at io.ktor.server.netty.NettyApplicationCallHandler$handleRequest$1.invoke(NettyApplicationCallHandler.kt)
	at kotlinx.coroutines.intrinsics.UndispatchedKt.startCoroutineUndispatched(Undispatched.kt:20)
	at kotlinx.coroutines.CoroutineStart.invoke(CoroutineStart.kt:360)
	at kotlinx.coroutines.AbstractCoroutine.start(AbstractCoroutine.kt:124)
	at kotlinx.coroutines.BuildersKt__Builders_commonKt.launch(Builders.common.kt:52)
	at kotlinx.coroutines.BuildersKt.launch(Unknown Source)
	at io.ktor.server.netty.NettyApplicationCallHandler.handleRequest(NettyApplicationCallHandler.kt:41)
	at io.ktor.server.netty.NettyApplicationCallHandler.channelRead(NettyApplicationCallHandler.kt:33)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444)
	at io.netty.channel.AbstractChannelHandlerContext.access$600(AbstractChannelHandlerContext.java:61)
	at io.netty.channel.AbstractChannelHandlerContext$7.run(AbstractChannelHandlerContext.java:425)
	at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:173)
	at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:166)
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:569)
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.base/java.lang.Thread.run(Thread.java:840)
2024-10-16 21:37:34.820 [eventLoopGroupProxy-4-2] TRACE i.k.s.p.c.ContentNegotiation - Skipping response body transformation from HttpStatusCode to OutgoingContent for the GET /api/menus request because the HttpStatusCode type is ignored. See [ContentNegotiationConfig::ignoreType].

 

강의를 보면서 따라가고 있는데, 바로 에러가 났다. 타입 직렬화를 안맞춰줘서 그랬던건데, 사용하고 있는 DataClass에 `@Serializable` 달아주면 해결된다.

List를 반환할때는 Serializable이 필수다.

 

LocalDateTime의 경우에는 Serializable이 안된다. 자바 클래스가 코틀린의 플러그인을 못찾는 것인데, 이걸 보조설정을 해야된다.

@Serializable(with=LocalDateTimeSerializer::class)
val orderedAt: LocalDateTime,

클래스를 직접 맵핑해주면 직렬화가 잘 된다.

 

 

 

 

 

 

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