I’m having some issues using `asCompletableFuture`...

# coroutines

[Jonathan Walsh]

I’m having some issues using asCompletableFuture. It seems to hang if my coroutine throws an exception.

class CompletableFutureTest {
    @Test
    fun testFailAsCompletableFuture() {

        val executeJob = async {
            fail("Test failed predictably")
        }

        val future = executeJob.asCompletableFuture()
        println("### asCompletableFuture")
        future.get()
        println("### Execute job completed!")
    }
}

I get this stacktrace in the log

Exception in thread "ForkJoinPool.commonPool-worker-1 @coroutine#1" kotlinx.coroutines.experimental.CompletionHandlerException: Exception in completion handler InvokeOnCompletion[InvokeOnCompletion@377acc75] for "coroutine#1":DeferredCoroutine{CompletedExceptionally}@685fc50a
	at kotlinx.coroutines.experimental.JobSupport.completeUpdateState(JobSupport.kt:226)
	at kotlinx.coroutines.experimental.JobSupport.updateState(JobSupport.kt:157)
	at kotlinx.coroutines.experimental.JobSupport.makeCompletingInternal(JobSupport.kt:568)
	at kotlinx.coroutines.experimental.JobSupport.makeCompletingOnce$kotlinx_coroutines_core(JobSupport.kt:552)
	at kotlinx.coroutines.experimental.AbstractCoroutine.resumeWithException(AbstractCoroutine.kt:110)
	at kotlin.coroutines.experimental.jvm.internal.CoroutineImpl.resume(CoroutineImpl.kt:41)
	at kotlinx.coroutines.experimental.DispatchedTask$DefaultImpls.run(Dispatched.kt:150)
	at kotlinx.coroutines.experimental.DispatchedContinuation.run(Dispatched.kt:14)
	at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1402)
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)
Caused by: java.lang.AssertionError: Test failed predictably
	at org.junit.Assert.fail(Assert.java:88)
	at kotlin.test.junit.JUnitAsserter.fail(JUnitSupport.kt:56)
	at kotlin.test.AssertionsKt__AssertionsKt.fail(Assertions.kt:89)
	at kotlin.test.AssertionsKt.fail(Unknown Source)
	at completable.future.test.CompletableFutureTest$testFailAsCompletableFuture$executeJob$1.doResume(CompletableFutureTest.kt:14)
	at kotlin.coroutines.experimental.jvm.internal.CoroutineImpl.resume(CoroutineImpl.kt:42)
	... 7 more

[Vsevolod Tolstopyatov [JB]]

It looks like a bug: https://github.com/Kotlin/kotlinx.coroutines/issues/469

[Jonathan Walsh]

thanks