Upgrade to Akka 2.6.0

build.sbt

@@ -29,6 +29,7 @@ lazy val root = (project in file("."))
       // Production dependencies
       "com.typesafe.play" %% "play"        % playVersion,
       "com.typesafe.akka" %% "akka-remote" % AkkaVersion,
+      "com.typesafe.akka" %% "akka-slf4j"  % AkkaVersion,
       // Test dependencies for running a Play server
       "com.typesafe.play" %% "play-akka-http-server" % playVersion % Test,
       "com.typesafe.play" %% "play-logback"          % playVersion % Test,

project/Dependencies.scala

@@ -3,5 +3,5 @@ object Dependencies {
   val Scala212 = "2.12.15" // sync! see comment above
   val Scala213 = "2.13.8"  // sync! see comment above
 
-  val AkkaVersion = "2.5.32"
+  val AkkaVersion = "2.6.19"
 }

src/main/scala/play/engineio/EngineIOSessionActor.scala

@@ -121,7 +121,8 @@ class EngineIOSessionActor[SessionData](
   import EngineIOManagerActor._
   import EngineIOSessionActor._
 
-  private val sessionTick = context.system.scheduler.schedule(config.pingInterval, config.pingInterval, self, Tick)
+  private val sessionTick =
+    context.system.scheduler.scheduleAtFixedRate(config.pingInterval, config.pingInterval, self, Tick)
 
   override def postStop() = {
     retrieveRequesters.foreach { case (transport, (RetrieveRequester(requester, requestId))) =>

src/main/scala/play/socketio/SocketIOSessionFlow.scala

@@ -314,13 +314,13 @@ private class SocketIOSessionStage[SessionData](
           }
         }
 
-        override def onPull() = {
+        override def onPull(): Unit = {
           if (isAvailable(engineIOOut)) {
             pull(engineIOIn)
           }
         }
 
-        override def onDownstreamFinish() = {
+        override def onDownstreamFinish(cause: Throwable): Unit = {
           // Cancel the ins so we can't get any more events
           cancel(engineIOIn)
           cancel(socketIOIn)

src/test/java/play/socketio/javadsl/TestSocketIOJavaApplication.java

@@ -48,7 +48,7 @@ protected void configure() {
             bind(Router.class).toProvider(new RouterProvider(routerBuilder));
           }
         })
-        .build().getWrappedApplication();
+        .build().asScala();
 
     System.out.println("Started Java application.");
     return application;