Why does cancelling my running akka quickstart example app throw a java error? - scala

Question

When I hit control-C to cancel my running akka quickstart app I get the following error.
Is this normal or is there an akka config that can avoid this?
Can someone explain why this occurs?
sbt:akka-quickstart-scala> exit
[info] shutting down sbt server
[warn] Run canceled.
Exception in thread "sbt-bg-threads-1" java.util.concurrent.RejectedExecutionException
at java.util.concurrent.ForkJoinPool.externalSubmit(ForkJoinPool.java:2328)
at java.util.concurrent.ForkJoinPool.externalPush(ForkJoinPool.java:2419)
at java.util.concurrent.ForkJoinPool.execute(ForkJoinPool.java:2648)
at scala.concurrent.impl.ExecutionContextImpl.execute(ExecutionContextImpl.scala:24)
at sbt.internal.BackgroundThreadPool$BackgroundRunnable.$anonfun$cleanup$1(DefaultBackgroundJobService.scala:390)
at sbt.internal.BackgroundThreadPool$BackgroundRunnable.$anonfun$cleanup$1$adapted(DefaultBackgroundJobService.scala:389)
at scala.collection.immutable.List.foreach(List.scala:392)
at sbt.internal.BackgroundThreadPool$BackgroundRunnable.cleanup(DefaultBackgroundJobService.scala:389)
at sbt.internal.BackgroundThreadPool$BackgroundRunnable.run(DefaultBackgroundJobService.scala:359)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

Answer 1

This is a known issue that can be seen in this github issue link.
In my case, When I upgraded my sbt to 1.3.3, same issue cropped up, my akka code was not getting closed using CTRL+C when launched by sbt run. It only logs a warning message and does not stop. So, I had to downgrade the sbt version from 1.3.3 to 1.2.8 to make it work.
Please let me know if it helps!!