Play WS Standalone: Instantiating StandaloneAhcWSClient causes some wierd issues

Question

What I'm trying to accomplish is pretty much straight forward:

1. Instantiate a standalone instance as described here

2. calling the remote service

However, if I run the test class I get this error:

java.lang.NoSuchMethodError: scala.Product.$init$(Lscala/Product;)V at akka.util.Timeout.

You'll find the full stacktrace further below.

Any idea what could cause the issue and how to make the example work?

package restclient

import org.junit.runner.RunWith
import org.scalatest._
import org.scalatest.junit.JUnitRunner

@RunWith(classOf[JUnitRunner])
class RestClientTest extends WordSpecLike with ShouldMatchers {

  trait Fixture {
    val restClient = new RestClientImpl
  }

  "The Rest client" should {
    "" in new Fixture {
      val res = restClient.call("http://localhost:3000/post")
      res shouldBe "c"
    }
  }

}

=============================================

package restclient

import akka.actor.ActorSystem
import akka.stream.ActorMaterializer
import play.api.libs.ws.ahc._

// still WIP
trait RestClient {
  def call(url: String): String
}

class RestClientImpl extends RestClient {

  override def call(url: String): String = {

    // Create Akka system for thread and streaming management
    implicit val system = ActorSystem()
    system.registerOnTermination {
      System.exit(0)
    }
    implicit val m = ActorMaterializer()

    val wsClient = StandaloneAhcWSClient()
    "x"
  }

}

=============================================

java.lang.NoSuchMethodError: scala.Product.$init$(Lscala/Product;)V at akka.util.Timeout.(Timeout.scala:13) at akka.actor.ActorSystem$Settings.(ActorSystem.scala:327) at akka.actor.ActorSystemImpl.(ActorSystem.scala:650) at akka.actor.ActorSystem$.apply(ActorSystem.scala:244) at akka.actor.ActorSystem$.apply(ActorSystem.scala:287) at akka.actor.ActorSystem$.apply(ActorSystem.scala:232) at akka.actor.ActorSystem$.apply(ActorSystem.scala:223) at restclient.RestClientImpl.call(RestClientImpl.scala:28) at restclient.RestClientTest$$anonfun$1$$anonfun$apply$mcV$sp$1$$anon$1.(RestClientTest.scala:16) at restclient.RestClientTest$$anonfun$1$$anonfun$apply$mcV$sp$1.apply$mcV$sp(RestClientTest.scala:15) at restclient.RestClientTest$$anonfun$1$$anonfun$apply$mcV$sp$1.apply(RestClientTest.scala:15) at restclient.RestClientTest$$anonfun$1$$anonfun$apply$mcV$sp$1.apply(RestClientTest.scala:15) at org.scalatest.Transformer$$anonfun$apply$1.apply$mcV$sp(Transformer.scala:22) at org.scalatest.OutcomeOf$class.outcomeOf(OutcomeOf.scala:85) at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104) at org.scalatest.Transformer.apply(Transformer.scala:22) at org.scalatest.Transformer.apply(Transformer.scala:20) at org.scalatest.WordSpecLike$$anon$1.apply(WordSpecLike.scala:953) at org.scalatest.Suite$class.withFixture(Suite.scala:1122) at restclient.RestClientTest.withFixture(RestClientTest.scala:8) at

=============================================

    <dependency>
        <groupId>com.typesafe.play</groupId>
        <artifactId>play-ahc-ws-standalone_2.12</artifactId>
        <version>1.0.7</version>
    </dependency>
    <dependency>
        <groupId>com.typesafe.play</groupId>
        <artifactId>play-ws-standalone-json_2.12</artifactId>
        <version>1.0.7</version>
    </dependency>