Akka-http: "scala.MatchError: application/xml" when using alpakka-s3

[vvlevykin]

Versions:

• Akka: 2.5.3
• Akka-HTTP: 10.0.8
• Alpakka-s3: 0.9

I'm trying to upload a stream using alpakka-s3 and getting an error:

scala.MatchError: application/xml (of class akka.http.scaladsl.model.ContentType$WithMissingCharset)
        at akka.http.scaladsl.model.ContentTypeRange.matches(ContentType.scala:17)
        at akka.http.scaladsl.unmarshalling.Unmarshaller$EnhancedFromEntityUnmarshaller$.$anonfun$forContentTypes$4(Unmarshaller.scala:112)
        at akka.http.scaladsl.unmarshalling.Unmarshaller$EnhancedFromEntityUnmarshaller$.$anonfun$forContentTypes$4$adapted(Unmarshaller.scala:112)
        at scala.collection.IndexedSeqOptimized.prefixLengthImpl(IndexedSeqOptimized.scala:37)
        at scala.collection.IndexedSeqOptimized.exists(IndexedSeqOptimized.scala:45)
        at scala.collection.IndexedSeqOptimized.exists$(IndexedSeqOptimized.scala:45)
        at scala.collection.mutable.WrappedArray.exists(WrappedArray.scala:38)
        at akka.http.scaladsl.unmarshalling.Unmarshaller$EnhancedFromEntityUnmarshaller$.$anonfun$forContentTypes$3(Unmarshaller.scala:112)
        at akka.http.scaladsl.unmarshalling.Unmarshaller$$anon$1.apply(Unmarshaller.scala:58)
        at akka.http.scaladsl.unmarshalling.Unmarshaller$EnhancedUnmarshaller$.$anonfun$mapWithInput$3(Unmarshaller.scala:91)
        at akka.http.scaladsl.unmarshalling.Unmarshaller$$anon$1.apply(Unmarshaller.scala:58)
        at akka.http.scaladsl.unmarshalling.Unmarshaller.$anonfun$transform$3(Unmarshaller.scala:23)
        at akka.http.scaladsl.unmarshalling.Unmarshaller$$anon$1.apply(Unmarshaller.scala:58)
        at akka.http.scaladsl.unmarshalling.Unmarshal.to(Unmarshal.scala:25)
        at akka.stream.alpakka.s3.impl.S3Stream.$anonfun$signAndGetAs$2(S3Stream.scala:242)
        at scala.concurrent.Future.$anonfun$flatMap$1(Future.scala:302)
        at scala.concurrent.impl.Promise.$anonfun$transformWith$1(Promise.scala:37)
        at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:60)
        at akka.dispatch.BatchingExecutor$AbstractBatch.processBatch(BatchingExecutor.scala:55)
        at akka.dispatch.BatchingExecutor$BlockableBatch.$anonfun$run$1(BatchingExecutor.scala:91)
        at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
        at scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:81)
        at akka.dispatch.BatchingExecutor$BlockableBatch.run(BatchingExecutor.scala:91)
        at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:38)
        at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(ForkJoinExecutorConfigurator.scala:43)
        at akka.dispatch.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
        at akka.dispatch.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
        at akka.dispatch.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
        at akka.dispatch.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

There is no error with Akka-HTTP <10.0.8.

[jypma]

This is caused by jm.ContentType not being a sealed trait, and hence not causing any compiler warnings. Someone ought to try to make that a sealed trait, so we can squash all warnings.

[jypma]

Originally introduced by https://github.com/akka/akka-http/issues/1141 .

[2m]

@jypma thanks for a quick fix. How often do you think this is going to be an issue with 10.0.8? We should decide when to release 10.0.9 according to this.

[jypma]

@2m The issue shows every time the akka-http-xml unmarshaller hits a content-type of application/xml (without charset). Hard to say how often that is; apparently it's true for S3, maybe other APIs do that as well.

[timothyklim]

We've problems with all xml webhooks after upgrade to 10.0.8. Is there any plans to release 10.0.9 soon with that hotfix?

[ktoso]

@TimothyKlim Yes, we'll be releasing a fixed version very soon