Hi everyone,
I am quite new to Akka and Websockets. I tried to create a simple Websocket
server using Akka HTTP following mostly this example [1].
Everytime I send a message to my own server I get the following exception:
[ERROR] [09/18/2016 15:37:01.533] [default-akka.actor.default-dispatcher-4]
[akka.actor.ActorSystemImpl(default)] WebSocket handler failed with
java.lang.String cannot be cast to akka.http.javadsl.model.ws.Message
java.lang.ClassCastException: java.lang.String cannot be cast to
akka.http.javadsl.model.ws.Message
at akka.stream.impl.fusing.Map$$anon$8.onPush(Ops.scala:42)
at
akka.stream.impl.fusing.GraphInterpreter.processPush(GraphInterpreter.scala:747)
at
akka.stream.impl.fusing.GraphInterpreter.processEvent(GraphInterpreter.scala:710)
at
akka.stream.impl.fusing.GraphInterpreter.execute(GraphInterpreter.scala:616)
at
akka.stream.impl.fusing.GraphInterpreterShell.runBatch(ActorGraphInterpreter.scala:471)
at
akka.stream.impl.fusing.GraphInterpreterShell.receive(ActorGraphInterpreter.scala:410)
at
akka.stream.impl.fusing.ActorGraphInterpreter.akka$stream$impl$fusing$ActorGraphInterpreter$$processEvent(ActorGraphInterpreter.scala:603)
at
akka.stream.impl.fusing.ActorGraphInterpreter$$anonfun$receive$1.applyOrElse(ActorGraphInterpreter.scala:618)
at akka.actor.Actor.aroundReceive(Actor.scala:484)
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526)
at akka.actor.ActorCell.invoke(ActorCell.scala:495)
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257)
at akka.dispatch.Mailbox.run(Mailbox.scala:224)
at akka.dispatch.Mailbox.exec(Mailbox.scala:234)
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
at
java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
at
java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)
Currently, I have no idea why it crashes like this because the method
handleWebSocketMessages() expects a Flow<Message, Message, T> so there is
no chance I could use a String. Did I miss some configuration for implicit
conversion?
You can see the server here [2] and the client here [3]. I am using Akka
HTTP Core and Experimental 2.12.0-RC1 version 2.4.10.
Thank you for your help.
Cheers,
Ronny
[1]
http://markatta.com/codemonkey/blog/2016/04/18/chat-with-akka-http-websockets/
[2] https://gist.github.com/rbraeunlich/e2582075e2ccc0fd63580bdd95585aa5
[3] https://gist.github.com/rbraeunlich/eded91382d72a3d90e8182ca1b077d01
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