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NoSuchMethodError when switching protocols to WebSockets

See original GitHub issue

I’m getting an exception while attempting to listen for inbound WebSocket connections with 0.9.1-alpha-8:

2018-01-14 09:26:50 [nettyCallPool-4-2] ERROR ktor.application - 101 Switching Protocols: GET - /ws
java.lang.NoSuchMethodError: kotlinx.coroutines.experimental.channels.ActorKt.actor(Lkotlin/coroutines/experimental/CoroutineContext;ILkotlinx/coroutines/experimental/CoroutineStart;Lkotlin/jvm/functions/Function2;)Lkotlinx/coroutines/experimental/channels/SendChannel;
	at io.ktor.websocket.WebSocketWriter.<init>(WebSocketWriter.kt:10)
	at io.ktor.websocket.RawWebSocketImpl.<init>(RawWebSocketImpl.kt:18)
	at io.ktor.websocket.WebSocketUpgrade.upgrade(WebSocketUpgrade.kt:37)
	at io.ktor.server.netty.http1.NettyHttp1ApplicationResponse.respondUpgrade(NettyHttp1ApplicationResponse.kt:69)
	at io.ktor.server.engine.BaseApplicationResponse.respondOutgoingContent$suspendImpl(BaseApplicationResponse.kt:62)
	at io.ktor.server.engine.BaseApplicationResponse.respondOutgoingContent(BaseApplicationResponse.kt)
	at io.ktor.server.netty.NettyApplicationResponse.respondOutgoingContent$suspendImpl(NettyApplicationResponse.kt:39)
	at io.ktor.server.netty.NettyApplicationResponse.respondOutgoingContent(NettyApplicationResponse.kt)
	at io.ktor.server.engine.BaseApplicationResponse$$special$$inlined$apply$lambda$1.doResume(BaseApplicationResponse.kt:33)
	at io.ktor.server.engine.BaseApplicationResponse$$special$$inlined$apply$lambda$1.invoke(BaseApplicationResponse.kt)
	at io.ktor.server.engine.BaseApplicationResponse$$special$$inlined$apply$lambda$1.invoke(BaseApplicationResponse.kt:14)
	at io.ktor.pipeline.PipelineContext.proceed(PipelineContext.kt:31)
	at io.ktor.pipeline.PipelineContext.proceedWith(PipelineContext.kt:20)
	at io.ktor.server.engine.DefaultTransformKt$installDefaultTransformations$1.doResume(DefaultTransform.kt:15)
	at io.ktor.server.engine.DefaultTransformKt$installDefaultTransformations$1.invoke(DefaultTransform.kt)
	at io.ktor.server.engine.DefaultTransformKt$installDefaultTransformations$1.invoke(DefaultTransform.kt)
	at io.ktor.pipeline.PipelineContext.proceed(PipelineContext.kt:31)
	at io.ktor.pipeline.Pipeline.execute(Pipeline.kt:16)
	at io.ktor.websocket.RoutingKt.respondWebSocketRaw(Routing.kt:131)
	at io.ktor.websocket.RoutingKt$webSocketRaw$1$1$1$1.doResume(Routing.kt:28)
	at io.ktor.websocket.RoutingKt$webSocketRaw$1$1$1$1.invoke(Routing.kt)
	at io.ktor.websocket.RoutingKt$webSocketRaw$1$1$1$1.invoke(Routing.kt)
	at io.ktor.pipeline.PipelineContext.proceed(PipelineContext.kt:31)
	at io.ktor.pipeline.Pipeline.execute(Pipeline.kt:16)
	at io.ktor.routing.Routing.executeResult(Routing.kt:88)
	at io.ktor.routing.Routing.interceptor(Routing.kt:18)
	at io.ktor.routing.Routing$Feature$install$1.doResume(Routing.kt:59)
	at io.ktor.routing.Routing$Feature$install$1.invoke(Routing.kt)
	at io.ktor.routing.Routing$Feature$install$1.invoke(Routing.kt:44)
	at io.ktor.pipeline.PipelineContext.proceed(PipelineContext.kt:31)
	at io.ktor.features.CallLogging$Feature$install$1.doResume(CallLogging.kt:42)
	at io.ktor.features.CallLogging$Feature$install$1.invoke(CallLogging.kt)
	at io.ktor.features.CallLogging$Feature$install$1.invoke(CallLogging.kt:34)
	at io.ktor.pipeline.PipelineContext.proceed(PipelineContext.kt:31)
	at io.ktor.pipeline.Pipeline.execute(Pipeline.kt:16)
	at io.ktor.server.engine.DefaultEnginePipelineKt$defaultEnginePipeline$2.doResume(DefaultEnginePipeline.kt:66)
	at io.ktor.server.engine.DefaultEnginePipelineKt$defaultEnginePipeline$2.invoke(DefaultEnginePipeline.kt)
	at io.ktor.server.engine.DefaultEnginePipelineKt$defaultEnginePipeline$2.invoke(DefaultEnginePipeline.kt)
	at io.ktor.pipeline.PipelineContext.proceed(PipelineContext.kt:31)
	at io.ktor.pipeline.Pipeline.execute(Pipeline.kt:16)
	at io.ktor.server.netty.NettyApplicationCallHandler$handleRequest$1.doResume(NettyApplicationCallHandler.kt:25)
	at io.ktor.server.netty.NettyApplicationCallHandler$handleRequest$1.invoke(NettyApplicationCallHandler.kt)
	at io.ktor.server.netty.NettyApplicationCallHandler$handleRequest$1.invoke(NettyApplicationCallHandler.kt:10)
	at kotlinx.coroutines.experimental.intrinsics.UndispatchedKt.startCoroutineUndispatched(Undispatched.kt:51)
	at kotlinx.coroutines.experimental.CoroutineStart.invoke(CoroutineStart.kt:115)
	at kotlinx.coroutines.experimental.BuildersKt.launch(Builders.kt:66)
	at kotlinx.coroutines.experimental.BuildersKt.launch$default(Builders.kt:58)
	at kotlinx.coroutines.experimental.BuildersKt.launch(Builders.kt:77)
	at io.ktor.server.netty.NettyApplicationCallHandler.handleRequest(NettyApplicationCallHandler.kt:20)
	at io.ktor.server.netty.NettyApplicationCallHandler.channelRead(NettyApplicationCallHandler.kt:14)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.access$600(AbstractChannelHandlerContext.java:38)
	at io.netty.channel.AbstractChannelHandlerContext$7.run(AbstractChannelHandlerContext.java:353)
	at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:403)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:462)
	at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858)
	at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:138)
	at java.lang.Thread.run(Thread.java:748)