ktor网站通过freemarker自动托管'；行不通

我正在与kotlin handson“Ktor互动网站”一起练习， 我没有正确的词语来解释我的代码发生了什么，但我可以说： 当我导航到http://localhost:8080/ IDE显示此错误有时不起作用

    2020-11-27 16:01:59.144 [main] INFO  Application - No ktor.deployment.watch patterns specified, automatic reload is not active
2020-11-27 16:02:00.677 [main] INFO  Application - Responding at http://0.0.0.0:8080
Exception in thread "eventLoopGroupProxy-3-1 @response-pipeline#3" kotlinx.coroutines.CoroutinesInternalError: Fatal exception in coroutines machinery for DispatchedContinuation[UnsafeBlockingTrampoline@76907f9f, Continuation at io.ktor.utils.io.jvm.javaio.OutputAdapter$loop$1.loop(Blocking.kt:311)@aa7a293]. Please read KDoc to 'handleFatalException' method and report this incident to maintainers
    at kotlinx.coroutines.DispatchedTask.handleFatalException$kotlinx_coroutines_core(DispatchedTask.kt:93)
    at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:64)
    at io.ktor.utils.io.jvm.javaio.UnsafeBlockingTrampoline.dispatch(Blocking.kt:296)
    at kotlinx.coroutines.DispatchedContinuation.resumeWith(DispatchedContinuation.kt:184)
    at io.ktor.utils.io.jvm.javaio.BlockingAdapter$end$1.resumeWith(Blocking.kt:163)
    at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:46)
    at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:56)
    at io.ktor.utils.io.jvm.javaio.UnsafeBlockingTrampoline.dispatch(Blocking.kt:296)
    at kotlinx.coroutines.DispatchedContinuation.resumeWith(DispatchedContinuation.kt:184)
    at io.ktor.utils.io.internal.CancellableReusableContinuation.resumeWith(CancellableReusableContinuation.kt:93)
    at io.ktor.utils.io.ByteBufferChannel.resumeWriteOp(ByteBufferChannel.kt:2258)
    at io.ktor.utils.io.ByteBufferChannel.bytesRead(ByteBufferChannel.kt:929)
    at io.ktor.utils.io.ByteBufferChannel.consumed(ByteBufferChannel.kt:1953)
    at io.ktor.server.netty.cio.NettyResponsePipeline$processBodyFlusher$2.invokeSuspend(NettyResponsePipeline.kt:305)
    at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
    at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:56)
    at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
    at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:500)
    at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
    at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
    at io.ktor.server.netty.EventLoopGroupProxy$Companion$create$factory$1$1.run(NettyApplicationEngine.kt:215)
    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
    at java.base/java.lang.Thread.run(Thread.java:832)
Caused by: java.lang.ClassCastException: class kotlin.coroutines.jvm.internal.CompletedContinuation cannot be cast to class kotlinx.coroutines.DispatchedContinuation (kotlin.coroutines.jvm.internal.CompletedContinuation and kotlinx.coroutines.DispatchedContinuation are in unnamed module of loader 'app')
    at kotlinx.coroutines.CoroutineDispatcher.releaseInterceptedContinuation(CoroutineDispatcher.kt:103)
    at kotlin.coroutines.jvm.internal.ContinuationImpl.releaseIntercepted(ContinuationImpl.kt:118)
    at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:39)
    at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:55)
    ... 22 more

Application.kt

    package com.server

import freemarker.cache.ClassTemplateLoader
import io.ktor.application.*
import io.ktor.freemarker.*
import io.ktor.http.content.*
import io.ktor.response.*
import io.ktor.routing.*

fun main(args: Array<String>): Unit = io.ktor.server.netty.EngineMain.main(args)
//fun main(args: Array<String>) { embeddedServer(Netty, port = 8080, module = Application::module).apply { start(wait = true) } }

@Suppress("unused") // Referenced in application.conf
@kotlin.jvm.JvmOverloads
fun Application.module(testing: Boolean = false) {
    install(FreeMarker) {
        templateLoader = ClassTemplateLoader(this::class.java.classLoader, "templates")
    }

    routing {
        get("/") {
            call.respond(FreeMarkerContent("index.ftl",
                mapOf("data" to IndexData(listOf(1, 2, 3))), ""))
        }

        static("/files") {
            resources("files")
        }
    }
}

data class IndexData(val items: List<Int>)

application.conf

ktor {
deployment {
    port = 8080
    port = ${?PORT}
}
application {
    modules = [ com.server.ApplicationKt.module ]
}

}

项目结构

• 服务器/主-

  resources
       files
       templates
       Application.conf
       logback.xml
  src
       Application.kt 
  

这是最有可能的。使用Ktor 1.5.2，您的代码可以按预期工作

resources
     files
     templates
     Application.conf
     logback.xml
src
     Application.kt