Ktor development mode break Class Scanner

[frankois941]

Library Version What version are you using? grapql: 6.2.2 kotlin: 1.7.10 ktor: 2.1.0

Describe the bug A clear and concise description of what the bug is. From the example project https://github.com/ExpediaGroup/graphql-kotlin/tree/master/examples/server/ktor-server

Enabling the development mode of Ktor break class scanner and throw an exception

2022-09-08 19:17:17.430 [eventLoopGroupProxy-4-1] ERROR Application - Unhandled: GET - /sdl java.lang.ExceptionInInitializerError: null at com.expediagroup.graphql.examples.server.ktor.GraphQLModuleKt$graphQLModule$1$2.invokeSuspend(GraphQLModule.kt:39) at com.expediagroup.graphql.examples.server.ktor.GraphQLModuleKt$graphQLModule$1$2.invoke(GraphQLModule.kt) at com.expediagroup.graphql.examples.server.ktor.GraphQLModuleKt$graphQLModule$1$2.invoke(GraphQLModule.kt) at io.ktor.server.routing.Route$buildPipeline$1$1.invokeSuspend(Route.kt:116) at io.ktor.server.routing.Route$buildPipeline$1$1.invoke(Route.kt) at io.ktor.server.routing.Route$buildPipeline$1$1.invoke(Route.kt) at io.ktor.util.pipeline.DebugPipelineContext.proceedLoop(DebugPipelineContext.kt:80) at io.ktor.util.pipeline.DebugPipelineContext.proceed(DebugPipelineContext.kt:57) at io.ktor.util.pipeline.DebugPipelineContext.execute$ktor_utils(DebugPipelineContext.kt:63) at io.ktor.util.pipeline.Pipeline.execute(Pipeline.kt:77) at io.ktor.server.routing.Routing$executeResult$$inlined$execute$1.invokeSuspend(Pipeline.kt:478) at io.ktor.server.routing.Routing$executeResult$$inlined$execute$1.invoke(Pipeline.kt) at io.ktor.server.routing.Routing$executeResult$$inlined$execute$1.invoke(Pipeline.kt) at io.ktor.util.debug.ContextUtilsKt$initContextInDebugMode$2.invokeSuspend(ContextUtils.kt:20) at io.ktor.util.debug.ContextUtilsKt$initContextInDebugMode$2.invoke(ContextUtils.kt) at io.ktor.util.debug.ContextUtilsKt$initContextInDebugMode$2.invoke(ContextUtils.kt) at kotlinx.coroutines.intrinsics.UndispatchedKt.startUndispatchedOrReturn(Undispatched.kt:89) at kotlinx.coroutines.BuildersKt__Builders_commonKt.withContext(Builders.common.kt:169) at kotlinx.coroutines.BuildersKt.withContext(Unknown Source) at io.ktor.util.debug.ContextUtilsKt.initContextInDebugMode(ContextUtils.kt:20) at io.ktor.server.routing.Routing.executeResult(Routing.kt:174) at io.ktor.server.routing.Routing.interceptor(Routing.kt:49) at io.ktor.server.routing.Routing$Plugin$install$1.invokeSuspend(Routing.kt:124) at io.ktor.server.routing.Routing$Plugin$install$1.invoke(Routing.kt) at io.ktor.server.routing.Routing$Plugin$install$1.invoke(Routing.kt) at io.ktor.util.pipeline.DebugPipelineContext.proceedLoop(DebugPipelineContext.kt:80) at io.ktor.util.pipeline.DebugPipelineContext.proceed(DebugPipelineContext.kt:57) at io.ktor.server.engine.BaseApplicationEngineKt$installDefaultTransformationChecker$1.invokeSuspend(BaseApplicationEngine.kt:122) at io.ktor.server.engine.BaseApplicationEngineKt$installDefaultTransformationChecker$1.invoke(BaseApplicationEngine.kt) at io.ktor.server.engine.BaseApplicationEngineKt$installDefaultTransformationChecker$1.invoke(BaseApplicationEngine.kt) at io.ktor.util.pipeline.DebugPipelineContext.proceedLoop(DebugPipelineContext.kt:80) at io.ktor.util.pipeline.DebugPipelineContext.proceed(DebugPipelineContext.kt:57) at io.ktor.util.pipeline.DebugPipelineContext.execute$ktor_utils(DebugPipelineContext.kt:63) at io.ktor.util.pipeline.Pipeline.execute(Pipeline.kt:77) at io.ktor.server.engine.DefaultEnginePipelineKt$defaultEnginePipeline$1$invokeSuspend$$inlined$execute$1.invokeSuspend(Pipeline.kt:478) at io.ktor.server.engine.DefaultEnginePipelineKt$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$2.invokeSuspend(ContextUtils.kt:20) at io.ktor.util.debug.ContextUtilsKt$initContextInDebugMode$2.invoke(ContextUtils.kt) at io.ktor.util.debug.ContextUtilsKt$initContextInDebugMode$2.invoke(ContextUtils.kt) at kotlinx.coroutines.intrinsics.UndispatchedKt.startUndispatchedOrReturn(Undispatched.kt:89) at kotlinx.coroutines.BuildersKt__Builders_commonKt.withContext(Builders.common.kt:169) at kotlinx.coroutines.BuildersKt.withContext(Unknown Source) at io.ktor.util.debug.ContextUtilsKt.initContextInDebugMode(ContextUtils.kt:20) at io.ktor.server.engine.DefaultEnginePipelineKt$defaultEnginePipeline$1.invokeSuspend(DefaultEnginePipeline.kt:118) at io.ktor.server.engine.DefaultEnginePipelineKt$defaultEnginePipeline$1.invoke(DefaultEnginePipeline.kt) at io.ktor.server.engine.DefaultEnginePipelineKt$defaultEnginePipeline$1.invoke(DefaultEnginePipeline.kt) at io.ktor.util.pipeline.DebugPipelineContext.proceedLoop(DebugPipelineContext.kt:80) at io.ktor.util.pipeline.DebugPipelineContext.proceed(DebugPipelineContext.kt:57) at io.ktor.util.pipeline.DebugPipelineContext.execute$ktor_utils(DebugPipelineContext.kt:63) at io.ktor.util.pipeline.Pipeline.execute(Pipeline.kt:77) at io.ktor.server.netty.NettyApplicationCallHandler$handleRequest$1$invokeSuspend$$inlined$execute$1.invokeSuspend(Pipeline.kt:478) at io.ktor.server.netty.NettyApplicationCallHandler$handleRequest$1$invokeSuspend$$inlined$execute$1.invoke(Pipeline.kt) at io.ktor.server.netty.NettyApplicationCallHandler$handleRequest$1$invokeSuspend$$inlined$execute$1.invoke(Pipeline.kt) at io.ktor.util.debug.ContextUtilsKt$initContextInDebugMode$2.invokeSuspend(ContextUtils.kt:20) at io.ktor.util.debug.ContextUtilsKt$initContextInDebugMode$2.invoke(ContextUtils.kt) at io.ktor.util.debug.ContextUtilsKt$initContextInDebugMode$2.invoke(ContextUtils.kt) at kotlinx.coroutines.intrinsics.UndispatchedKt.startUndispatchedOrReturn(Undispatched.kt:89) at kotlinx.coroutines.BuildersKt__Builders_commonKt.withContext(Builders.common.kt:169) at kotlinx.coroutines.BuildersKt.withContext(Unknown Source) at io.ktor.util.debug.ContextUtilsKt.initContextInDebugMode(ContextUtils.kt:20) at io.ktor.server.netty.NettyApplicationCallHandler$handleRequest$1.invokeSuspend(NettyApplicationCallHandler.kt:119) at io.ktor.server.netty.NettyApplicationCallHandler$handleRequest$1.invoke(NettyApplicationCallHandler.kt) at io.ktor.server.netty.NettyApplicationCallHandler$handleRequest$1.invoke(NettyApplicationCallHandler.kt) at kotlinx.coroutines.intrinsics.UndispatchedKt.startCoroutineUndispatched(Undispatched.kt:55) at kotlinx.coroutines.CoroutineStart.invoke(CoroutineStart.kt:112) at kotlinx.coroutines.AbstractCoroutine.start(AbstractCoroutine.kt:126) at kotlinx.coroutines.BuildersKt__Builders_commonKt.launch(Builders.common.kt:56) at kotlinx.coroutines.BuildersKt.launch(Unknown Source) at io.ktor.server.netty.NettyApplicationCallHandler.handleRequest(NettyApplicationCallHandler.kt:37) at io.ktor.server.netty.NettyApplicationCallHandler.channelRead(NettyApplicationCallHandler.kt:29) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) at io.netty.channel.AbstractChannelHandlerContext.access$600(AbstractChannelHandlerContext.java:61) at io.netty.channel.AbstractChannelHandlerContext$7.run(AbstractChannelHandlerContext.java:370) at io.netty.util.concurrent.AbstractEventExecutor.runTask$$$capture(AbstractEventExecutor.java:174) at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java) at io.netty.util.concurrent.AbstractEventExecutor.safeExecute$$$capture(AbstractEventExecutor.java:167) at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java) at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:503) at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) at io.ktor.server.netty.EventLoopGroupProxy$Companion.create$lambda-1$lambda-0(NettyApplicationEngine.kt:285) at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) at java.base/java.lang.Thread.run(Thread.java:829) Caused by: com.expediagroup.graphql.generator.exceptions.InvalidPackagesException: The configured packages do not contain any valid classes: "[com.expediagroup.graphql.examples.server.ktor]" at com.expediagroup.graphql.generator.SchemaGenerator.<init>(SchemaGenerator.kt:65) at com.expediagroup.graphql.generator.ToSchemaKt.toSchema(toSchema.kt:41) at com.expediagroup.graphql.generator.ToSchemaKt.toSchema$default(toSchema.kt:34) at com.expediagroup.graphql.examples.server.ktor.KtorGraphQLSchemaKt.<clinit>(ktorGraphQLSchema.kt:43) ... 85 common frames omitted

To Reproduce Steps to reproduce the behavior. Please provide:

• Schema Configuration
• Kotlin code used to generate the schema

Add in the application.conf file and inside the ktor section this line development = true

Expected behavior A clear and concise description of what you expected to happen.

The graphql schema is built

[jmfayard]

I wasted three hours yersterday for the same reason https://kotlinlang.slack.com/archives/CQLNT7B29/p1663652648073829

It would be nice that graphql-kotlin detects that ktor is in the stacktrace and suggest that this might be the issue

[dariuszkuc]

Instead of using ClassGraph to scan your classpath (which was only used for obtaining polymorphic type hierarchy and to locate federated entities), you can now explicitly specify this information when generating the schema. See https://github.com/ExpediaGroup/graphql-kotlin/pull/1733