Hi there, you're running into "val referring to not yet initialized val" problems.
This can happen if you have traits linearize (http://ktoso.github.io/scala-types-of-types/#type-linearization-vs-the-diamond-problem), in such order that one trait refers with a `val` to another before the first one has a chance to initialize etc. In general if you have a lot of routes refering to one another I'd recommend making them `lazy val` instead. // FYI: This is a general Scala thing, it could happen with "val x = a + b" if b was not yet initialized. Hope this helps, happy hakking! -- Cheers, Konrad 'ktoso’ Malawski Akka @ Lightbend On 24 March 2016 at 20:28:08, Pouria Mellati (pou...@takor.com.au) wrote: I think I've ran into a akka-http bug. I have a big-ass route: val route = pathPrefix("users") { ... } And wanted to add this new route to it: val blockingEndpoint = (pathPrefix("users" / "blocked") & authentication) {issuerId => path(JavaUUID) {blockeeId => put { complete{HttpResponse(NotImplemented)} } ~ delete { complete{HttpResponse(NotImplemented)} } } ~ get { complete{HttpResponse(NotImplemented)} } } Now, if I simply do: val route = pathPrefix("users") { ... } ~ blockingEndpoint I will get the following NPE if I send a request towards the routes in blockingEndpoint: java.lang.NullPointerException: null at akka.http.scaladsl.server.RouteConcatenation$RouteWithConcatenation$$anonfun$$tilde$1$$anonfun$apply$1.apply(RouteConcatenation.scala:28) ~[akka-http-experimental_2.11-2.0.2.jar:na] at akka.http.scaladsl.server.RouteConcatenation$RouteWithConcatenation$$anonfun$$tilde$1$$anonfun$apply$1.apply(RouteConcatenation.scala:25) ~[akka-http-experimental_2.11-2.0.2.jar:na] at akka.http.scaladsl.util.FastFuture$.akka$http$scaladsl$util$FastFuture$$strictTransform$1(FastFuture.scala:41) ~[akka-http-core-experimental_2.11-2.0.2.jar:na] at akka.http.scaladsl.util.FastFuture$.transformWith$extension1(FastFuture.scala:45) ~[akka-http-core-experimental_2.11-2.0.2.jar:na] at akka.http.scaladsl.util.FastFuture$.flatMap$extension(FastFuture.scala:26) ~[akka-http-core-experimental_2.11-2.0.2.jar:na] at akka.http.scaladsl.server.RouteConcatenation$RouteWithConcatenation$$anonfun$$tilde$1.apply(RouteConcatenation.scala:25) ~[akka-http-experimental_2.11-2.0.2.jar:na] at akka.http.scaladsl.server.RouteConcatenation$RouteWithConcatenation$$anonfun$$tilde$1.apply(RouteConcatenation.scala:23) ~[akka-http-experimental_2.11-2.0.2.jar:na] at akka.http.scaladsl.server.directives.BasicDirectives$$anonfun$mapRouteResultWith$1$$anonfun$apply$4.apply(BasicDirectives.scala:35) ~[akka-http-experimental_2.11-2.0.2.jar:na] at akka.http.scaladsl.server.directives.BasicDirectives$$anonfun$mapRouteResultWith$1$$anonfun$apply$4.apply(BasicDirectives.scala:35) ~[akka-http-experimental_2.11-2.0.2.jar:na] at akka.http.scaladsl.server.directives.BasicDirectives$$anonfun$textract$1$$anonfun$apply$5.apply(BasicDirectives.scala:88) ~[akka-http-experimental_2.11-2.0.2.jar:na] at akka.http.scaladsl.server.directives.BasicDirectives$$anonfun$textract$1$$anonfun$apply$5.apply(BasicDirectives.scala:88) ~[akka-http-experimental_2.11-2.0.2.jar:na] at akka.http.scaladsl.server.directives.ExecutionDirectives$$anonfun$handleExceptions$1$$anonfun$apply$1.apply(ExecutionDirectives.scala:27) ~[akka-http-experimental_2.11-2.0.2.jar:na] at akka.http.scaladsl.server.directives.ExecutionDirectives$$anonfun$handleExceptions$1$$anonfun$apply$1.apply(ExecutionDirectives.scala:23) ~[akka-http-experimental_2.11-2.0.2.jar:na] at akka.http.scaladsl.server.Route$$anonfun$asyncHandler$1.apply(Route.scala:64) ~[akka-http-experimental_2.11-2.0.2.jar:na] at akka.http.scaladsl.server.Route$$anonfun$asyncHandler$1.apply(Route.scala:63) ~[akka-http-experimental_2.11-2.0.2.jar:na] at akka.stream.impl.fusing.MapAsync$$anon$9$$anon$10.onPush(Ops.scala:590) ~[akka-stream-experimental_2.11-2.0.2.jar:na] at akka.stream.impl.fusing.GraphInterpreter.processElement$1(GraphInterpreter.scala:575) ~[akka-stream-experimental_2.11-2.0.2.jar:na] at akka.stream.impl.fusing.GraphInterpreter.processEvent(GraphInterpreter.scala:586) ~[akka-stream-experimental_2.11-2.0.2.jar:na] at akka.stream.impl.fusing.GraphInterpreter.execute(GraphInterpreter.scala:533) ~[akka-stream-experimental_2.11-2.0.2.jar:na] at akka.stream.impl.fusing.GraphInterpreterShell.runBatch(ActorGraphInterpreter.scala:445) ~[akka-stream-experimental_2.11-2.0.2.jar:na] at akka.stream.impl.fusing.GraphInterpreterShell.receive(ActorGraphInterpreter.scala:400) ~[akka-stream-experimental_2.11-2.0.2.jar:na] at akka.stream.impl.fusing.ActorGraphInterpreter$$anonfun$receive$1.applyOrElse(ActorGraphInterpreter.scala:549) ~[akka-stream-experimental_2.11-2.0.2.jar:na] at akka.actor.Actor$class.aroundReceive(Actor.scala:480) ~[akka-actor_2.11-2.4.1.jar:na] at akka.stream.impl.fusing.ActorGraphInterpreter.aroundReceive(ActorGraphInterpreter.scala:495) ~[akka-stream-experimental_2.11-2.0.2.jar:na] at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526) [akka-actor_2.11-2.4.1.jar:na] at akka.actor.ActorCell.invoke(ActorCell.scala:495) [akka-actor_2.11-2.4.1.jar:na] at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257) [akka-actor_2.11-2.4.1.jar:na] at akka.dispatch.Mailbox.run(Mailbox.scala:224) [akka-actor_2.11-2.4.1.jar:na] at akka.dispatch.Mailbox.exec(Mailbox.scala:234) [akka-actor_2.11-2.4.1.jar:na] at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260) [scala-library-2.11.7.jar:na] at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339) [scala-library-2.11.7.jar:na] at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979) [scala-library-2.11.7.jar:na] at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107) [scala-library-2.11.7.jar:na] On the other hand, adding the new routes directly to routes (i.e. without defining blockingEndpoint) works fine: val route = pathPrefix("users") { ... } ~ (pathPrefix("users" / "blocked") & authentication) {issuerId => path(JavaUUID) {blockeeId => put { complete{HttpResponse(NotImplemented)} } ~ delete { complete{HttpResponse(NotImplemented)} } } ~ get { complete{HttpResponse(NotImplemented)} } } My akka version: "2.4.1" My akka streams and http version = "2.0.2" Thanks. -- >>>>>>>>>> Read the docs: http://akka.io/docs/ >>>>>>>>>> Check the FAQ: >>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html >>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user --- You received this message because you are 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