diff --git a/akka-actor-typed-tests/src/test/scala/akka/actor/typed/BehaviorSpec.scala b/akka-actor-typed-tests/src/test/scala/akka/actor/typed/BehaviorSpec.scala
index 7c83e7ff9e..f3208f062b 100644
--- a/akka-actor-typed-tests/src/test/scala/akka/actor/typed/BehaviorSpec.scala
+++ b/akka-actor-typed-tests/src/test/scala/akka/actor/typed/BehaviorSpec.scala
@@ -273,8 +273,6 @@ object BehaviorSpec {
   }
 
   trait Become extends Common with Unhandled {
-    private implicit val inbox = TestInbox[State]("state")
-
     "Becoming" must {
       "must be in state A" in {
         mkCtx().check(GetState()(StateA))
diff --git a/akka-actor-typed-tests/src/test/scala/akka/actor/typed/OrElseSpec.scala b/akka-actor-typed-tests/src/test/scala/akka/actor/typed/OrElseSpec.scala
index 196acb0788..9bacbda5fb 100644
--- a/akka-actor-typed-tests/src/test/scala/akka/actor/typed/OrElseSpec.scala
+++ b/akka-actor-typed-tests/src/test/scala/akka/actor/typed/OrElseSpec.scala
@@ -4,10 +4,7 @@
 
 package akka.actor.typed
 
-import scala.util.control.NoStackTrace
-
 import akka.actor.typed.scaladsl.Behaviors
-import akka.actor.testkit.typed.TestKitSettings
 import akka.actor.testkit.typed.scaladsl._
 import org.scalatest.WordSpecLike
 
diff --git a/akka-actor-typed-tests/src/test/scala/akka/actor/typed/scaladsl/MessageAdapterSpec.scala b/akka-actor-typed-tests/src/test/scala/akka/actor/typed/scaladsl/MessageAdapterSpec.scala
index ebc9339b22..91ec9d9cb3 100644
--- a/akka-actor-typed-tests/src/test/scala/akka/actor/typed/scaladsl/MessageAdapterSpec.scala
+++ b/akka-actor-typed-tests/src/test/scala/akka/actor/typed/scaladsl/MessageAdapterSpec.scala
@@ -9,7 +9,6 @@ import akka.actor.typed.ActorRef
 import akka.actor.typed.Behavior
 import akka.actor.typed.PostStop
 import akka.actor.typed.Props
-import akka.actor.typed.SupervisorStrategy
 import akka.actor.typed.TestException
 import akka.actor.typed.TypedAkkaSpecWithShutdown
 import akka.testkit.EventFilter
diff --git a/akka-actor-typed-tests/src/test/scala/akka/actor/typed/scaladsl/StopSpec.scala b/akka-actor-typed-tests/src/test/scala/akka/actor/typed/scaladsl/StopSpec.scala
index 91cb15f1b6..8e08523d21 100644
--- a/akka-actor-typed-tests/src/test/scala/akka/actor/typed/scaladsl/StopSpec.scala
+++ b/akka-actor-typed-tests/src/test/scala/akka/actor/typed/scaladsl/StopSpec.scala
@@ -6,9 +6,8 @@ package akka.actor.typed.scaladsl
 
 import akka.Done
 import akka.actor.testkit.typed.TE
-import akka.actor.testkit.typed.scaladsl.{ ActorTestKit, TestProbe }
-import akka.actor.typed.{ Behavior, PostStop, SupervisorStrategy, Terminated, TypedAkkaSpecWithShutdown }
-import akka.testkit.EventFilter
+import akka.actor.testkit.typed.scaladsl.ActorTestKit
+import akka.actor.typed.{ PostStop, TypedAkkaSpecWithShutdown }
 
 import scala.concurrent.Promise
 
diff --git a/akka-actor-typed/src/main/scala/akka/actor/typed/SupervisorStrategy.scala b/akka-actor-typed/src/main/scala/akka/actor/typed/SupervisorStrategy.scala
index 2948ac4416..9d52c7a200 100644
--- a/akka-actor-typed/src/main/scala/akka/actor/typed/SupervisorStrategy.scala
+++ b/akka-actor-typed/src/main/scala/akka/actor/typed/SupervisorStrategy.scala
@@ -4,8 +4,6 @@
 
 package akka.actor.typed
 
-import java.time
-
 import akka.annotation.InternalApi
 import scala.concurrent.duration.FiniteDuration
 import scala.concurrent.duration.Duration
diff --git a/akka-actor-typed/src/main/scala/akka/actor/typed/internal/Restarter.scala b/akka-actor-typed/src/main/scala/akka/actor/typed/internal/Restarter.scala
index 725f9768a9..2785b0fef0 100644
--- a/akka-actor-typed/src/main/scala/akka/actor/typed/internal/Restarter.scala
+++ b/akka-actor-typed/src/main/scala/akka/actor/typed/internal/Restarter.scala
@@ -13,7 +13,6 @@ import akka.actor.typed.scaladsl.Behaviors
 import akka.annotation.InternalApi
 import akka.util.{ OptionVal, PrettyDuration }
 
-import scala.annotation.tailrec
 import scala.concurrent.duration.{ Deadline, FiniteDuration }
 import scala.reflect.ClassTag
 import scala.util.control.Exception.Catcher
diff --git a/akka-actor-typed/src/main/scala/akka/actor/typed/internal/StashBufferImpl.scala b/akka-actor-typed/src/main/scala/akka/actor/typed/internal/StashBufferImpl.scala
index 3ec6aa908b..a15334130d 100644
--- a/akka-actor-typed/src/main/scala/akka/actor/typed/internal/StashBufferImpl.scala
+++ b/akka-actor-typed/src/main/scala/akka/actor/typed/internal/StashBufferImpl.scala
@@ -7,7 +7,6 @@ package akka.actor.typed.internal
 import java.util.function.Consumer
 import java.util.function.{ Function ⇒ JFunction }
 
-import akka.actor.typed.ActorContext
 import akka.actor.typed.Behavior
 import akka.actor.typed.javadsl
 import akka.actor.typed.scaladsl
diff --git a/akka-actor-typed/src/main/scala/akka/actor/typed/internal/adapter/ActorAdapter.scala b/akka-actor-typed/src/main/scala/akka/actor/typed/internal/adapter/ActorAdapter.scala
index c422bc895e..970c6f56f7 100644
--- a/akka-actor-typed/src/main/scala/akka/actor/typed/internal/adapter/ActorAdapter.scala
+++ b/akka-actor-typed/src/main/scala/akka/actor/typed/internal/adapter/ActorAdapter.scala
@@ -14,7 +14,6 @@ import scala.util.Try
 import akka.{ actor ⇒ a }
 import akka.annotation.InternalApi
 import akka.util.OptionVal
-import scala.util.control.NonFatal
 
 /**
  * INTERNAL API
diff --git a/akka-remote/src/main/scala/akka/remote/artery/ImmutableLongMap.scala b/akka-remote/src/main/scala/akka/remote/artery/ImmutableLongMap.scala
index a8363ee30a..3b252da521 100644
--- a/akka-remote/src/main/scala/akka/remote/artery/ImmutableLongMap.scala
+++ b/akka-remote/src/main/scala/akka/remote/artery/ImmutableLongMap.scala
@@ -16,8 +16,6 @@ import akka.util.HashCode
 private[akka] object ImmutableLongMap {
   def empty[A >: Null](implicit t: ClassTag[A]): ImmutableLongMap[A] =
     new ImmutableLongMap(Array.emptyLongArray, Array.empty)
-
-  private val MaxScanLength = 10
 }
 
 /**
diff --git a/akka-remote/src/main/scala/akka/remote/transport/netty/SSLEngineProvider.scala b/akka-remote/src/main/scala/akka/remote/transport/netty/SSLEngineProvider.scala
index 8b396367cb..ec9e2f5d82 100644
--- a/akka-remote/src/main/scala/akka/remote/transport/netty/SSLEngineProvider.scala
+++ b/akka-remote/src/main/scala/akka/remote/transport/netty/SSLEngineProvider.scala
@@ -12,32 +12,21 @@ import java.security.GeneralSecurityException
 import java.security.KeyStore
 import java.security.SecureRandom
 
-import scala.annotation.tailrec
 import scala.util.Try
 
 import akka.actor.ActorSystem
-import akka.actor.ExtendedActorSystem
 import akka.annotation.ApiMayChange
-import akka.event.LogMarker
 import akka.event.Logging
 import akka.event.MarkerLoggingAdapter
-import akka.japi.Util.immutableSeq
-import akka.remote.RemoteTransport
-import akka.remote.RemoteActorRefProvider
 import akka.remote.RemoteTransportException
 import akka.remote.artery.tcp.SecureRandomFactory
-import akka.remote.security.provider.AkkaProvider
-import akka.remote.transport.AbstractTransportAdapter
 import akka.stream.IgnoreComplete
 import akka.stream.TLSClosing
 import akka.stream.TLSRole
-import com.typesafe.config.Config
-import com.typesafe.sslconfig.ssl.SSLConfigSettings
 import javax.net.ssl.KeyManager
 import javax.net.ssl.KeyManagerFactory
 import javax.net.ssl.SSLContext
 import javax.net.ssl.SSLEngine
-import javax.net.ssl.SSLSession
 import javax.net.ssl.TrustManager
 import javax.net.ssl.TrustManagerFactory
 
diff --git a/akka-stream/src/main/scala/akka/stream/javadsl/Graph.scala b/akka-stream/src/main/scala/akka/stream/javadsl/Graph.scala
index 1ff26448b7..5eec2f66d7 100644
--- a/akka-stream/src/main/scala/akka/stream/javadsl/Graph.scala
+++ b/akka-stream/src/main/scala/akka/stream/javadsl/Graph.scala
@@ -13,11 +13,7 @@ import akka.util.ConstantFun
 
 import scala.annotation.unchecked.uncheckedVariance
 import scala.collection.JavaConverters._
-import akka.stream.scaladsl.{ GenericGraph, GenericGraphWithChangedAttributes }
-import akka.stream.Attributes
-import akka.stream.impl.TraversalBuilder
-
-import scala.collection.parallel.immutable
+import akka.stream.scaladsl.GenericGraph
 
 /**
  * Merge several streams, taking elements as they arrive from input streams