Is it normal that `Job cancel ` throws a `CancellationExcept kotlinlang #ktor

java.util.concurrent.CancellationException: Job was cancelled
    at io.ktor.client.engine.UtilsKt$attachToUserJob$cleanupHandler$1.invoke(Utils.kt:77)
    at io.ktor.client.engine.UtilsKt$attachToUserJob$cleanupHandler$1.invoke(Unknown Source:2)
    …
    at kotlinx.coroutines.JobSupport.cancel(JobSupport.kt:614)
    at kotlinx.coroutines.Job$DefaultImpls.cancel$default(Job.kt:164)

elizarov

04/07/2020, 3:27 PM

Looks like a bug.

luke

04/10/2020, 2:15 AM

This is expected behaviour. https://kotlinlang.org/docs/reference/coroutines/cancellation-and-timeouts.html#cancellation-is-cooperative

Marc Knaup

04/10/2020, 2:20 AM

@luke yes, but the call that's canceled should throw the exception, not the code that initiates the cancelation.

luke

04/10/2020, 2:27 AM

Does this not indicate that an instance of

Job

can throw a

CancellationException

when calling

cancel()

? https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines/-job/cancel.html

Marc Knaup

04/10/2020, 2:30 AM

No, it doesn't

luke

04/10/2020, 2:39 AM

Nope, you're right, sorry. I have no idea then.

olegivo

02/14/2023, 1:29 PM

It must be a

kotlin.coroutines.cancellation.CancellationException

but was

java.util.concurrent.CancellationException

Something went wrong. I have this bug now

I searched for that exception and here some old but not fixed bugs: • https://youtrack.jetbrains.com/issue/KTOR-2628 • https://youtrack.jetbrains.com/issue/KTOR-1054/Occasional-Channel-has-been-cancelled-errors-when-using-OkHttp • https://github.com/ktorio/ktor/issues/1946

to work around this behavior I use this construction in HttpResponseValidator block:

handleResponseExceptionWithRequest { exception, _ ->
    when (exception) {
        is java.util.concurrent.CancellationException -> throw kotlin.coroutines.cancellation.CancellationException(exception)
        else -> throw exception
    }
}

Maybe, the problem is in linking wrong exception type

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