Apologies if this has been discussed before, but I did a search and couldn't find anyone mentioning this issue. There are a couple of ways to construct an actor now, most of which has been depreciated in favor of a Props(classOf[MyActor]) style. However, if the Actor has default arguments set and you call it with that style with those arguments missing you will get an error. I've made a test case in this rep:
https://github.com/efuquen/akka-default-arg-construction The output of the test, which should provide enough detail of the situation, follows: This: class TestActor(pongMessage: String, defaultArg: Int = 2) should be a valid constructor for: Props(classOf[TestActor], "ponggggg!!!") But failed with: java.lang.IllegalArgumentException: no matching constructor found on class com.parascal.akka.TestActor for arguments [class java.lang.String] at akka.util.Reflect$.error$1(Reflect.scala:82) at akka.util.Reflect$.findConstructor(Reflect.scala:106) at akka.actor.ArgsReflectConstructor.<init>(Props.scala:347) at akka.actor.IndirectActorProducer$.apply(Props.scala:306) at akka.actor.Props.producer(Props.scala:173) at akka.actor.Props.<init>(Props.scala:186) at akka.actor.Props$.apply(Props.scala:93) at com.parascal.akka.Main$.main(Main.scala:16) at com.parascal.akka.Main.main(Main.scala) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at sbt.Run.invokeMain(Run.scala:72) at sbt.Run.run0(Run.scala:65) at sbt.Run.sbt$Run$$execute$1(Run.scala:54) at sbt.Run$$anonfun$run$1.apply$mcV$sp(Run.scala:58) at sbt.Run$$anonfun$run$1.apply(Run.scala:58) at sbt.Run$$anonfun$run$1.apply(Run.scala:58) at sbt.Logger$$anon$4.apply(Logger.scala:90) at sbt.TrapExit$App.run(TrapExit.scala:244) at java.lang.Thread.run(Thread.java:724) It will succeed with: Props(classOf[TestActor], "ponggggg!!!", 2) ponggggg!!! I imagine this is due to a reflection issue on the actor, but I don't see any reason this shouldn't be taken into account. It's a bit frustrating as I've had to fallback to a deprecated way of constructing actors, i.e. Props(new TestActor("ponggg!!!")). Is this a known issue, has anyone else come across it? -- >>>>>>>>>> Read the docs: http://akka.io/docs/ >>>>>>>>>> Check the FAQ: http://akka.io/faq/ >>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user --- You received this message because you are subscribed to the Google Groups "Akka User List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/akka-user. For more options, visit https://groups.google.com/groups/opt_out.
