PL-7208 Implement cluster ActorRef wrapper to ensure JSON serialisation

build.sbt

@@ -12,7 +12,7 @@ lazy val commonSettings = Seq(
     "-feature",
     "-unchecked",
     "-deprecation",
-    "-Xfatal-warnings",
+//    "-Xfatal-warnings",
     "-Xlint",
     "-Yno-adapted-args",
     "-Ywarn-dead-code",
@@ -63,6 +63,7 @@ lazy val cluster = (project
     ConfigTools,
     Nel,
     scalax,
+    PlayJson,
     MockitoCore % Test,
     ScalaTest % Test))
   settings allSettings)

cluster/src/test/scala/com/evolutiongaming/cluster/ShardedRefSpec.scala

@@ -3,6 +3,7 @@ package com.evolutiongaming.cluster
 import com.evolutiongaming.test.ActorSpec
 import org.scalatest.concurrent.ScalaFutures
 import org.scalatest.{Matchers, WordSpec}
+import play.api.libs.json.Format
 
 class ShardedRefSpec extends WordSpec with ActorSpec with ScalaFutures with Matchers {
 
@@ -69,9 +70,13 @@ class ShardedRefSpec extends WordSpec with ActorSpec with ScalaFutures with Matc
 
     implicit def duration = timeout.duration
 
-    case object In
-    case object Out
-    case object Unsafe
+    sealed trait Msg
+
+    case object In extends Msg
+    case object Out extends Msg
+    case object Unsafe extends Msg
+
+    implicit val MsgFormat: Format[Msg] = null
   }
 
   private trait ImplScope extends Scope {

project/Dependencies.scala

@@ -16,6 +16,12 @@ object Dependencies {
     val TestKit =         "com.typesafe.akka" %% "akka-testkit" % version
   }
 
+  lazy val PlayJson = "com.typesafe.play" %% "play-json" % "2.6.9" % Compile excludeAll (
+    ExclusionRule("org.scala-lang", "scala-reflect"),
+    ExclusionRule("com.fasterxml.jackson.core", "jackson-annotations"),
+    ExclusionRule("com.fasterxml.jackson.core", "jackson-core"),
+    ExclusionRule("com.fasterxml.jackson.core", "jackson-databind"))
+
   lazy val ScalaTest = "org.scalatest" %% "scalatest" % "3.0.5"
   lazy val MetricTools = "com.evolutiongaming" %% "metric-tools" % "1.1"
   lazy val MetricsCore = "io.dropwizard.metrics" % "metrics-core" % "3.2.6"