I don’t know how I managed to delete my last messa...

# ktor

[Satyam Agarwal]

I don’t know how I managed to delete my last message. Here it goes, can anyone help me please ?

Using ktor (server side) = 1.4.2, coroutines = 1.3.9, jdk14, kotlin = 1.4.10 and proemtheus java client = 0.9.0, this code throws :

get("/") {
    call.respondTextWriter {
        withContext(IO) {    TextFormat.write004(this@respondTextWriter, CollectorRegistry.defaultRegistry.metricFamilySamples()) } 
    }
}

Exception in thread "eventLoopGroupProxy-3-1" kotlinx.coroutines.CoroutinesInternalError: Fatal exception in coroutines machinery for DispatchedContinuation[UnsafeBlockingTrampoline@381151be, Continuation at io.ktor.utils.io.jvm.javaio.OutputAdapter$loop$1.loop(Blocking.kt:311)@33f7436b]. Please read KDoc to 'handleFatalException' method and report this incident to maintainers
	at kotlinx.coroutines.DispatchedTask.handleFatalException$kotlinx_coroutines_core(DispatchedTask.kt:144)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:115)
	at io.ktor.utils.io.jvm.javaio.UnsafeBlockingTrampoline.dispatch(Blocking.kt:296)
	at kotlinx.coroutines.internal.DispatchedContinuation.resumeWith(DispatchedContinuation.kt:184)
	at io.ktor.utils.io.jvm.javaio.BlockingAdapter$end$1.resumeWith(Blocking.kt:163)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:46)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
	at io.ktor.utils.io.jvm.javaio.UnsafeBlockingTrampoline.dispatch(Blocking.kt:296)
	at kotlinx.coroutines.internal.DispatchedContinuation.resumeWith(DispatchedContinuation.kt:184)
	at io.ktor.utils.io.internal.CancellableReusableContinuation.resumeWith(CancellableReusableContinuation.kt:93)
	at io.ktor.utils.io.ByteBufferChannel.resumeWriteOp(ByteBufferChannel.kt:2258)
	at io.ktor.utils.io.ByteBufferChannel.bytesRead(ByteBufferChannel.kt:929)
	at io.ktor.utils.io.ByteBufferChannel.consumed(ByteBufferChannel.kt:1953)
	at io.ktor.server.netty.cio.NettyResponsePipeline$processBodyFlusher$2.invokeSuspend(NettyResponsePipeline.kt:305)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
	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.internal.DispatchedContinuation (kotlin.coroutines.jvm.internal.CompletedContinuation and kotlinx.coroutines.internal.DispatchedContinuation are in unnamed module of loader 'app')
	at kotlinx.coroutines.CoroutineDispatcher.releaseInterceptedContinuation(CoroutineDispatcher.kt:104)
	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:104)
	... 22 more
`

[Satyam Agarwal]

@e5l should I file a issue on you track ?

[e5l]

@Vsevolod Tolstopyatov [JB] could you take a look?

[thomas]

I have the same issue. I do a call.respond with some data and have this error from time to time: class kotlin.coroutines.jvm.internal.CompletedContinuation cannot be cast to class kotlinx.coroutines.DispatchedContinuation

[enleur]

got the same issue multiple times

[Satyam Agarwal]

I have updated the issue https://youtrack.jetbrains.com/issue/KTOR-1342