Hi,

I'm unit-testing an Akka application and I'm triggering an assert upon a 
reentrant call to BatchingExecutor, which seems to me to be caused by the 
usage of the CallingThreadDispatcher. I'm still working on isolating the 
problem, but this does seem like a scenario we easily get into when using 
the CallingThreadDispatcher. Has anyone else experienced this?

TaskInvocation - TaskInvocation requirement failed
java.lang.IllegalArgumentException: requirement failed
  at scala.Predef$.require(Predef.scala:221) ~[scala-library-2.10.3.jar:na]
  at akka.dispatch.BatchingExecutor$Batch.run(BatchingExecutor.scala:55) 
~[akka-actor_2.10-2.2.4.jar:2.2.4]
  at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:39) 
~[akka-actor_2.10-2.2.4.jar:2.2.4]
  at 
akka.testkit.CallingThreadDispatcher.executeTask(CallingThreadDispatcher.scala:213)
 
~[akka-testkit_2.10-2.2.4.jar:na]
  at 
akka.dispatch.MessageDispatcher.unbatchedExecute(AbstractDispatcher.scala:143) 
~[akka-actor_2.10-2.2.4.jar:2.2.4]
  at 
akka.dispatch.BatchingExecutor$Batch$$anonfun$run$1.processBatch$1(BatchingExecutor.scala:76)
 
~[akka-actor_2.10-2.2.4.jar:2.2.4]
  at 
akka.dispatch.BatchingExecutor$Batch$$anonfun$run$1.apply$mcV$sp(BatchingExecutor.scala:82)
 
~[akka-actor_2.10-2.2.4.jar:2.2.4]
  at 
akka.dispatch.BatchingExecutor$Batch$$anonfun$run$1.apply(BatchingExecutor.scala:59)
 
~[akka-actor_2.10-2.2.4.jar:2.2.4]
  at 
akka.dispatch.BatchingExecutor$Batch$$anonfun$run$1.apply(BatchingExecutor.scala:59)
 
~[akka-actor_2.10-2.2.4.jar:2.2.4]
  at scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:72) 
~[scala-library-2.10.3.jar:na]
  at akka.dispatch.BatchingExecutor$Batch.run(BatchingExecutor.scala:58) 
~[akka-actor_2.10-2.2.4.jar:2.2.4]
  at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:39) 
~[akka-actor_2.10-2.2.4.jar:2.2.4]
  at 
akka.testkit.CallingThreadDispatcher.executeTask(CallingThreadDispatcher.scala:213)
 
~[akka-testkit_2.10-2.2.4.jar:na]
  at 
akka.dispatch.MessageDispatcher.unbatchedExecute(AbstractDispatcher.scala:143) 
~[akka-actor_2.10-2.2.4.jar:2.2.4]
  at 
akka.dispatch.BatchingExecutor$class.execute(BatchingExecutor.scala:110) 
~[akka-actor_2.10-2.2.4.jar:2.2.4]
  at akka.dispatch.MessageDispatcher.execute(AbstractDispatcher.scala:83) 
~[akka-actor_2.10-2.2.4.jar:2.2.4]
  at 
scala.concurrent.impl.CallbackRunnable.executeWithValue(Promise.scala:40) 
~[scala-library-2.10.3.jar:na]
  at 
scala.concurrent.impl.Promise$DefaultPromise.tryComplete(Promise.scala:248) 
~[scala-library-2.10.3.jar:na]
  at scala.concurrent.Promise$class.complete(Promise.scala:55) 
~[scala-library-2.10.3.jar:na]
  at 
scala.concurrent.impl.Promise$DefaultPromise.complete(Promise.scala:153) 
~[scala-library-2.10.3.jar:na]
  at scala.concurrent.Future$$anonfun$map$1.apply(Future.scala:235) 
~[scala-library-2.10.3.jar:na]
  at scala.concurrent.Future$$anonfun$map$1.apply(Future.scala:235) 
~[scala-library-2.10.3.jar:na]
  at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32) 
~[scala-library-2.10.3.jar:na]
  at 
scala.concurrent.Future$InternalCallbackExecutor$Batch$$anonfun$run$1.processBatch$1(Future.scala:640)
 
~[scala-library-2.10.3.jar:na]
  at 
scala.concurrent.Future$InternalCallbackExecutor$Batch$$anonfun$run$1.apply$mcV$sp(Future.scala:655)
 
~[scala-library-2.10.3.jar:na]
  at 
scala.concurrent.Future$InternalCallbackExecutor$Batch$$anonfun$run$1.apply(Future.scala:632)
 
~[scala-library-2.10.3.jar:na]
  at 
scala.concurrent.Future$InternalCallbackExecutor$Batch$$anonfun$run$1.apply(Future.scala:632)
 
~[scala-library-2.10.3.jar:na]
  at scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:72) 
~[scala-library-2.10.3.jar:na]
  at 
scala.concurrent.Future$InternalCallbackExecutor$Batch.run(Future.scala:631) 
~[scala-library-2.10.3.jar:na]
  at 
scala.concurrent.Future$InternalCallbackExecutor$.scala$concurrent$Future$InternalCallbackExecutor$$unbatchedExecute(Future.scala:691)
 
~[scala-library-2.10.3.jar:na]
  at 
scala.concurrent.Future$InternalCallbackExecutor$.execute(Future.scala:682) 
~[scala-library-2.10.3.jar:na]
  at 
scala.concurrent.impl.CallbackRunnable.executeWithValue(Promise.scala:40) 
~[scala-library-2.10.3.jar:na]
  at 
scala.concurrent.impl.Promise$DefaultPromise.tryComplete(Promise.scala:248) 
~[scala-library-2.10.3.jar:na]
  at akka.pattern.PromiseActorRef.$bang(AskSupport.scala:269) 
~[akka-actor_2.10-2.2.4.jar:2.2.4]
  at akka.actor.ActorRef.tell(ActorRef.scala:125) 
~[akka-actor_2.10-2.2.4.jar:2.2.4]

Thanks,
Duarte

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