Caused by: java.lang.NoClassDefFoundError: kotlinx/coroutines/experimental/CommonPool

[artem-bakuta]

when creating val appSchema = AppSchema(userServiceImpl) get error, somth wrong with coroutines syntax. Error appear when we try to create schema val schema = KGraphQL.schema {

> 
> Exception in thread "main" java.lang.reflect.InvocationTargetException
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:498)
> 	at kotlin.reflect.jvm.internal.calls.CallerImpl$Method.callMethod(CallerImpl.kt:97)
> 	at kotlin.reflect.jvm.internal.calls.CallerImpl$Method$Static.call(CallerImpl.kt:106)
> 	at kotlin.reflect.jvm.internal.KCallableImpl.callDefaultMethod$kotlin_reflect_api(KCallableImpl.kt:166)
> 	at kotlin.reflect.jvm.internal.KCallableImpl.callBy(KCallableImpl.kt:110)
> 	at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.callFunctionWithInjection(ApplicationEngineEnvironmentReloading.kt:349)
> 	at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.executeModuleFunction(ApplicationEngineEnvironmentReloading.kt:299)
> 	at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.instantiateAndConfigureApplication(ApplicationEngineEnvironmentReloading.kt:275)
> 	at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.createApplication(ApplicationEngineEnvironmentReloading.kt:127)
> 	at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.start(ApplicationEngineEnvironmentReloading.kt:247)
> 	at io.ktor.server.netty.NettyApplicationEngine.start(NettyApplicationEngine.kt:106)
> 	at io.ktor.server.netty.NettyApplicationEngine.start(NettyApplicationEngine.kt:18)
> 	at io.ktor.server.engine.ApplicationEngine$DefaultImpls.start$default(ApplicationEngine.kt:52)
> 	at io.ktor.server.netty.EngineMain.main(EngineMain.kt:17)
> 	at com.fashion.ApplicationKt.main(Application.kt:34)
> Caused by: java.lang.NoClassDefFoundError: kotlinx/coroutines/experimental/CommonPool
> 	at com.github.pgutkowski.kgraphql.schema.dsl.SchemaConfigurationDSL.<init>(SchemaConfigurationDSL.kt:16)
> 	at com.github.pgutkowski.kgraphql.schema.dsl.SchemaBuilder.<init>(SchemaBuilder.kt:18)
> 	at com.github.pgutkowski.kgraphql.KGraphQL$Companion.schema(KGraphQL.kt:8)
> 	at db.graphql.AppSchema.<init>(AppSchema.kt:8)
> 	at web.UserRoutesKt.users(UserRoutes.kt:18)
> 	at com.fashion.ApplicationKt$module$5.invoke(Application.kt:94)
> 	at com.fashion.ApplicationKt$module$5.invoke(Application.kt)
> 	at io.ktor.routing.Routing$Feature.install(Routing.kt:92)
> 	at io.ktor.routing.Routing$Feature.install(Routing.kt:78)
> 	at io.ktor.application.ApplicationFeatureKt.install(ApplicationFeature.kt:59)
> 	at io.ktor.routing.RoutingKt.routing(Routing.kt:121)
> 	at com.fashion.ApplicationKt.module(Application.kt:87)
> 	at com.fashion.ApplicationKt.module$default(Application.kt:38)
> 	... 18 more
> Caused by: java.lang.ClassNotFoundException: kotlinx.coroutines.experimental.CommonPool
> 	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
> 	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
> 	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
> 	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
> 	... 31 more

[ronsmits]

I think you need to give a bit more information about the build environment you are using:

• what java version (openjdk, oracle, 8, 9, 11, 12)
• what kotlin version

Did you get the code that is in the readme to work? That would be a good first start to check your environment