fix memory leaks in tests, #20659

akka-actor-tests/src/test/java/akka/event/LoggingAdapterTest.java

@@ -3,6 +3,7 @@ package akka.event;
 import akka.actor.ActorRef;
 import akka.actor.ActorSystem;
 import akka.actor.Props;
+import akka.testkit.AkkaJUnitActorSystemResource;
 import akka.testkit.JavaTestKit;
 import akka.event.Logging.Error;
 import akka.event.ActorWithMDC.Log;
@@ -10,6 +11,8 @@ import static akka.event.Logging.*;
 
 import com.typesafe.config.Config;
 import com.typesafe.config.ConfigFactory;
+import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
 import org.scalatest.junit.JUnitSuite;
 import scala.concurrent.duration.Duration;
@@ -30,9 +33,19 @@ public class LoggingAdapterTest extends JUnitSuite {
             "akka.actor.serialize-messages = off"
     );
 
+    @Rule
+    public AkkaJUnitActorSystemResource actorSystemResource = 
+        new AkkaJUnitActorSystemResource("LoggingAdapterTest", config);
+
+    private ActorSystem system = null;
+
+    @Before
+    public void beforeEach() {
+       system = actorSystemResource.getSystem();
+    }
+
     @Test
     public void mustFormatMessage() {
-        final ActorSystem system = ActorSystem.create("test-system", config);
         final LoggingAdapter log = Logging.getLogger(system, this);
         new LogJavaTestKit(system) {{
             system.eventStream().subscribe(getRef(), LogEvent.class);
@@ -66,7 +79,6 @@ public class LoggingAdapterTest extends JUnitSuite {
 
     @Test
     public void mustCallMdcForEveryLog() throws Exception {
-        final ActorSystem system = ActorSystem.create("test-system", config);
         new LogJavaTestKit(system) {{
             system.eventStream().subscribe(getRef(), LogEvent.class);
             ActorRef ref = system.actorOf(Props.create(ActorWithMDC.class));
@@ -86,7 +98,6 @@ public class LoggingAdapterTest extends JUnitSuite {
 
     @Test
     public void mustSupportMdcNull() throws Exception {
-        final ActorSystem system = ActorSystem.create("test-system", config);
         new LogJavaTestKit(system) {{
             system.eventStream().subscribe(getRef(), LogEvent.class);
             ActorRef ref = system.actorOf(Props.create(ActorWithMDC.class));
@@ -131,6 +142,7 @@ public class LoggingAdapterTest extends JUnitSuite {
 
         void expectLog(final Object level, final String message, final Throwable cause, final String mdc) {
             new ExpectMsg<Void>(Duration.create(3, TimeUnit.SECONDS), "LogEvent") {
+                @Override
                 protected Void match(Object event) {
                     LogEvent log = (LogEvent) event;
                     assertEquals(message, log.message());

akka-actor-tests/src/test/scala/akka/io/TcpConnectionSpec.scala

@@ -360,11 +360,10 @@ class TcpConnectionSpec extends AkkaSpec("""
 
     "respect pull mode" in new EstablishedConnectionTest(pullMode = true) {
       // override config to decrease default buffer size
-      val config =
+      def config =
-        ConfigFactory.load(
+        ConfigFactory.parseString("akka.io.tcp.direct-buffer-size = 1k")
-          ConfigFactory.parseString("akka.io.tcp.direct-buffer-size = 1k")
+          .withFallback(AkkaSpec.testConf)
-            .withFallback(AkkaSpec.testConf))
+      override implicit lazy val system: ActorSystem = ActorSystem("respectPullModeTest", config)
-      override implicit def system: ActorSystem = ActorSystem("respectPullModeTest", config)
 
       try run {
         val maxBufferSize = 1 * 1024
@@ -402,7 +401,7 @@ class TcpConnectionSpec extends AkkaSpec("""
 
         connectionHandler.expectMsgType[Received].data.decodeString("ASCII") should ===(vs)
       }
-      finally system.terminate()
+      finally shutdown(system)
     }
 
     "close the connection and reply with `Closed` upon reception of a `Close` command" in

akka-camel/src/test/java/akka/camel/CustomRouteTest.java

@@ -23,16 +23,21 @@ import java.util.concurrent.TimeUnit;
 public class CustomRouteTest extends JUnitSuite {
 
   @Rule
-  public AkkaJUnitActorSystemResource actorSystemResource =
+  public AkkaJUnitActorSystemResource actorSystemResource = new AkkaJUnitActorSystemResource("CustomRouteTest");
-    new AkkaJUnitActorSystemResource("CustomRouteTest");
 
-  private final ActorSystem system = actorSystemResource.getSystem();
+  private ActorSystem system = null;
-  private Camel camel = (Camel) CamelExtension.get(system);
+  private Camel camel = null;
 
   public static class MyActor extends UntypedActor {
     @Override public void onReceive(Object o) {}
   }
 
+  @Before
+  public void beforeEach() {
+    system = actorSystemResource.getSystem();
+    camel = (Camel) CamelExtension.get(system);
+  }
+
   @Test
   public void testCustomProducerRoute() throws Exception {
     MockEndpoint mockEndpoint = camel.context().getEndpoint("mock:mockProducer", MockEndpoint.class);
@@ -118,6 +123,7 @@ public class CustomRouteTest extends JUnitSuite {
   private void assertMockEndpoint(MockEndpoint mockEndpoint) throws InterruptedException {
     mockEndpoint.expectedMessageCount(1);
     mockEndpoint.expectedMessagesMatches(new Predicate() {
+      @Override
       public boolean matches(Exchange exchange) {
         return exchange.getIn().getBody().equals("test");
       }
@@ -126,8 +132,8 @@ public class CustomRouteTest extends JUnitSuite {
   }
 
   public static class CustomRouteBuilder extends RouteBuilder {
-    private String uri;
+    private final String uri;
-    private String fromUri;
+    private final String fromUri;
 
     public CustomRouteBuilder(String from, String to) {
       fromUri = from;
@@ -164,7 +170,7 @@ public class CustomRouteTest extends JUnitSuite {
   }
 
   public static class EndpointProducer extends UntypedProducerActor {
-    private String uri;
+    private final String uri;
 
     public EndpointProducer(String uri) {
       this.uri = uri;
@@ -192,8 +198,8 @@ public class CustomRouteTest extends JUnitSuite {
   }
 
   public static class TestAckConsumer extends UntypedConsumerActor {
-    private String myuri;
+    private final String myuri;
-    private String to;
+    private final String to;
 
     public TestAckConsumer(String uri, String to){
       myuri = uri;

akka-camel/src/test/scala/akka/camel/TestSupport.scala

@@ -48,7 +48,7 @@ private[camel] object TestSupport {
   }
 
   trait SharedCamelSystem extends BeforeAndAfterAll { this: Suite ⇒
-    implicit lazy val system = ActorSystem("test", AkkaSpec.testConf)
+    implicit lazy val system = ActorSystem("SharedCamelSystem", AkkaSpec.testConf)
     implicit lazy val camel = CamelExtension(system)
 
     abstract override protected def afterAll() {
@@ -63,7 +63,7 @@ private[camel] object TestSupport {
 
     override protected def beforeEach() {
       super.beforeEach()
-      system = ActorSystem("test", AkkaSpec.testConf)
+      system = ActorSystem("NonSharedCamelSystem", AkkaSpec.testConf)
       camel = CamelExtension(system)
     }
 

akka-camel/src/test/scala/akka/camel/internal/ActivationTrackerTest.scala

@@ -7,7 +7,7 @@ import akka.actor.{ Props, ActorSystem }
 import akka.testkit.{ TimingTest, TestProbe, TestKit }
 import akka.camel.internal.ActivationProtocol._
 
-class ActivationTrackerTest extends TestKit(ActorSystem("test")) with WordSpecLike with Matchers with BeforeAndAfterAll with BeforeAndAfterEach with GivenWhenThen {
+class ActivationTrackerTest extends TestKit(ActorSystem("ActivationTrackerTest")) with WordSpecLike with Matchers with BeforeAndAfterAll with BeforeAndAfterEach with GivenWhenThen {
 
   override protected def afterAll() { shutdown() }
 

akka-camel/src/test/scala/akka/camel/internal/component/ActorProducerTest.scala

@@ -30,7 +30,7 @@ import akka.util.Timeout
 import akka.actor._
 import akka.testkit._
 
-class ActorProducerTest extends TestKit(ActorSystem("test")) with WordSpecLike with Matchers with ActorProducerFixture {
+class ActorProducerTest extends TestKit(ActorSystem("ActorProducerTest")) with WordSpecLike with Matchers with ActorProducerFixture {
   implicit val timeout = Timeout(10 seconds)
 
   "ActorProducer" when {

akka-contrib/src/test/scala/akka/contrib/pattern/AggregatorSpec.scala

@@ -7,13 +7,11 @@ import akka.testkit.{ ImplicitSender, TestKit }
 import org.scalatest.FunSuiteLike
 import org.scalatest.Matchers
 import scala.annotation.tailrec
-
-//#demo-code
 import scala.collection._
 import scala.concurrent.duration._
 import scala.math.BigDecimal.int2bigDecimal
-
 import akka.actor._
+import org.scalatest.BeforeAndAfterAll
 /**
  * Sample and test code for the aggregator patter.
  * This is based on Jamie Allen's tutorial at
@@ -187,7 +185,11 @@ class ChainingSample extends Actor with Aggregator {
 }
 //#chain-sample
 
-class AggregatorSpec extends TestKit(ActorSystem("test")) with ImplicitSender with FunSuiteLike with Matchers {
+class AggregatorSpec extends TestKit(ActorSystem("AggregatorSpec")) with ImplicitSender with FunSuiteLike with Matchers with BeforeAndAfterAll {
+
+  override def afterAll(): Unit = {
+    shutdown()
+  }
 
   test("Test request 1 account type") {
     system.actorOf(Props[AccountBalanceRetriever]) ! GetCustomerAccountBalances(1, Set(Savings))
@@ -384,4 +386,4 @@ class WorkListSpec extends FunSuiteLike {
       processed
     }
   }
-}
+}

akka-docs/rst/java/code/docs/actor/FaultHandlingTest.java

@@ -151,7 +151,7 @@ public class FaultHandlingTest extends AbstractJavaTest {
 
   @BeforeClass
   public static void start() {
-    system = ActorSystem.create("test");
+    system = ActorSystem.create("FaultHandlingTest");
   }
 
   @AfterClass

akka-docs/rst/java/code/docs/actor/SchedulerDocTest.java

@@ -22,10 +22,10 @@ import akka.testkit.AkkaJUnitActorSystemResource;
 import org.junit.*;
 
 public class SchedulerDocTest extends AbstractJavaTest {
-
+  
-  @Rule
+  @ClassRule
-  public AkkaJUnitActorSystemResource actorSystemResource =
+  public static AkkaJUnitActorSystemResource actorSystemResource = new AkkaJUnitActorSystemResource("SchedulerDocTest",
-    new AkkaJUnitActorSystemResource("SchedulerDocTest", AkkaSpec.testConf());
+      AkkaSpec.testConf());
 
   private final ActorSystem system = actorSystemResource.getSystem();
   private ActorRef testActor = system.actorOf(Props.create(MyUntypedActor.class));

akka-docs/rst/java/code/docs/camel/CustomRouteTestBase.java

@@ -11,11 +11,14 @@ public class CustomRouteTestBase {
   public void customRoute() throws Exception{
     //#CustomRoute
     ActorSystem system = ActorSystem.create("some-system");
-    Camel camel = CamelExtension.get(system);
+    try {
-    ActorRef responder = system.actorOf(Props.create(Responder.class), "TestResponder");
+      Camel camel = CamelExtension.get(system);
-    camel.context().addRoutes(new CustomRouteBuilder(responder));
+      ActorRef responder = system.actorOf(Props.create(Responder.class), "TestResponder");
-    //#CustomRoute
+      camel.context().addRoutes(new CustomRouteBuilder(responder));
-    system.stop(responder);
+      //#CustomRoute
-    JavaTestKit.shutdownActorSystem(system);
+      system.stop(responder);
+    } finally {
+      JavaTestKit.shutdownActorSystem(system);
+    }
   }
 }

akka-docs/rst/java/code/docs/pattern/SchedulerPatternTest.java

@@ -130,6 +130,11 @@ public class SchedulerPatternTest extends AbstractJavaTest {
       testSchedule(probe, props, duration("3000 millis"), duration("2500 millis"));
     }};
   }
+  
+  @Test
+  public void doNothing() {
+    // actorSystemResource.after is not called when all tests are ignored
+  }
 
   public static class TestSchedule extends JavaTestKit {
     private ActorSystem system;

akka-docs/rst/scala/code/docs/io/ScalaUdpMulticastSpec.scala

@@ -6,16 +6,15 @@ package docs.io
 
 import java.net.{ Inet6Address, InetSocketAddress, NetworkInterface, StandardProtocolFamily }
 import java.nio.channels.DatagramChannel
-
 import scala.util.Random
 import akka.actor.{ ActorSystem, Props }
 import akka.io.Udp
 import akka.testkit.TestKit
 import org.scalatest.{ BeforeAndAfter, WordSpecLike }
-
 import scala.collection.JavaConversions.enumerationAsScalaIterator
+import org.scalatest.BeforeAndAfterAll
 
-class ScalaUdpMulticastSpec extends TestKit(ActorSystem("ScalaUdpMulticastSpec")) with WordSpecLike with BeforeAndAfter {
+class ScalaUdpMulticastSpec extends TestKit(ActorSystem("ScalaUdpMulticastSpec")) with WordSpecLike with BeforeAndAfterAll {
 
   "listener" should {
     "send message back to sink" in {
@@ -65,7 +64,7 @@ class ScalaUdpMulticastSpec extends TestKit(ActorSystem("ScalaUdpMulticastSpec")
     }
   }
 
-  def afterAll(): Unit = {
+  override def afterAll(): Unit = {
     TestKit.shutdownActorSystem(system)
   }
 

akka-docs/rst/scala/code/docs/testkit/ParentChildSpec.scala

@@ -11,6 +11,8 @@ import akka.testkit.ImplicitSender
 import akka.testkit.TestProbe
 import akka.testkit.TestActorRef
 import akka.actor.ActorRefFactory
+import akka.testkit.TestKit
+import org.scalatest.BeforeAndAfterAll
 
 /**
  * Parent-Child examples
@@ -74,8 +76,12 @@ class MockedChild extends Actor {
   }
 }
 
-class ParentChildSpec extends WordSpec with Matchers with TestKitBase {
+class ParentChildSpec extends WordSpec with Matchers with TestKitBase with BeforeAndAfterAll {
-  implicit lazy val system = ActorSystem()
+  implicit lazy val system = ActorSystem("ParentChildSpec")
+
+  override def afterAll(): Unit = {
+    TestKit.shutdownActorSystem(system)
+  }
 
   "A DependentChild" should {
     "be tested without its parent" in {
@@ -132,4 +138,4 @@ class ParentChildSpec extends WordSpec with Matchers with TestKitBase {
     }
   }
   //#test-fabricated-parent
-}
+}

akka-http-core/src/test/scala/akka/http/scaladsl/ClientSpec.scala

@@ -10,11 +10,12 @@ import akka.http.scaladsl.model.HttpMethods._
 import akka.stream.ActorMaterializer
 import com.typesafe.config.{ Config, ConfigFactory }
 import org.scalatest.{ Matchers, WordSpec }
-
 import scala.concurrent.duration._
 import scala.concurrent.{ Await }
+import org.scalatest.BeforeAndAfterAll
+import akka.testkit.TestKit
 
-class ClientSpec extends WordSpec with Matchers {
+class ClientSpec extends WordSpec with Matchers with BeforeAndAfterAll {
   val testConf: Config = ConfigFactory.parseString("""
     akka.loggers = ["akka.testkit.TestEventListener"]
     akka.loglevel = ERROR
@@ -25,6 +26,10 @@ class ClientSpec extends WordSpec with Matchers {
   implicit val system = ActorSystem(getClass.getSimpleName, testConf)
   implicit val materializer = ActorMaterializer()
 
+  override def afterAll(): Unit = {
+    TestKit.shutdownActorSystem(system)
+  }
+
   "HTTP Client" should {
 
     "reuse connection pool" in {

akka-http-core/src/test/scala/akka/http/scaladsl/TightRequestTimeoutSpec.scala

@@ -7,7 +7,6 @@ package akka.http.scaladsl
 import java.io.{ BufferedReader, BufferedWriter, InputStreamReader, OutputStreamWriter }
 import java.net.{ BindException, Socket }
 import java.util.concurrent.TimeoutException
-
 import akka.actor.ActorSystem
 import akka.event.Logging
 import akka.event.Logging.LogEvent
@@ -26,11 +25,11 @@ import akka.util.ByteString
 import com.typesafe.config.{ Config, ConfigFactory }
 import org.scalatest.concurrent.ScalaFutures
 import org.scalatest.{ BeforeAndAfterAll, Matchers, WordSpec }
-
 import scala.annotation.tailrec
 import scala.concurrent.duration._
 import scala.concurrent.{ Await, Future, Promise }
 import scala.util.{ Success, Try }
+import akka.testkit.TestKit
 
 class TightRequestTimeoutSpec extends WordSpec with Matchers with BeforeAndAfterAll with ScalaFutures {
   val testConf: Config = ConfigFactory.parseString("""
@@ -46,6 +45,10 @@ class TightRequestTimeoutSpec extends WordSpec with Matchers with BeforeAndAfter
   implicit val materializer = ActorMaterializer()
   implicit val patience = PatienceConfig(3.seconds)
 
+  override def afterAll(): Unit = {
+    TestKit.shutdownActorSystem(system)
+  }
+
   "Tight request timeout" should {
 
     "not cause double push error caused by the late response attemting to push" in {
@@ -65,4 +68,4 @@ class TightRequestTimeoutSpec extends WordSpec with Matchers with BeforeAndAfter
     }
 
   }
-}
+}

akka-stream-tests/src/test/java/akka/stream/StreamTest.java

@@ -7,7 +7,7 @@ package akka.stream;
 import org.scalatest.junit.JUnitSuite;
 
 import akka.actor.ActorSystem;
-import akka.stream.javadsl.AkkaJUnitActorSystemResource;
+import akka.testkit.AkkaJUnitActorSystemResource;
 
 public abstract class StreamTest extends JUnitSuite {
     final protected ActorSystem system;

akka-stream-tests/src/test/java/akka/stream/actor/ActorPublisherTest.java

@@ -3,7 +3,7 @@ package akka.stream.actor;
 import akka.actor.ActorRef;
 import akka.actor.Props;
 import akka.stream.StreamTest;
-import akka.stream.javadsl.AkkaJUnitActorSystemResource;
+import akka.testkit.AkkaJUnitActorSystemResource;
 import akka.stream.javadsl.Source;
 import akka.testkit.AkkaSpec;
 import akka.testkit.JavaTestKit;

akka-stream-tests/src/test/java/akka/stream/actor/ActorSubscriberTest.java

@@ -3,7 +3,7 @@ package akka.stream.actor;
 import akka.actor.ActorRef;
 import akka.actor.Props;
 import akka.stream.StreamTest;
-import akka.stream.javadsl.AkkaJUnitActorSystemResource;
+import akka.testkit.AkkaJUnitActorSystemResource;
 import akka.stream.javadsl.Sink;
 import akka.stream.javadsl.Source;
 import akka.testkit.AkkaSpec;

akka-stream-tests/src/test/java/akka/stream/io/InputStreamSinkTest.java

@@ -5,7 +5,7 @@ package akka.stream.io;
 
 import akka.japi.Pair;
 import akka.stream.StreamTest;
-import akka.stream.javadsl.AkkaJUnitActorSystemResource;
+import akka.testkit.AkkaJUnitActorSystemResource;
 import akka.stream.javadsl.Sink;
 import akka.stream.javadsl.Source;
 import akka.stream.javadsl.StreamConverters;

akka-stream-tests/src/test/java/akka/stream/io/OutputStreamSinkTest.java

@@ -5,7 +5,7 @@ package akka.stream.io;
 
 import akka.stream.IOResult;
 import akka.stream.StreamTest;
-import akka.stream.javadsl.AkkaJUnitActorSystemResource;
+import akka.testkit.AkkaJUnitActorSystemResource;
 import akka.stream.javadsl.Source;
 import akka.stream.javadsl.StreamConverters;
 import akka.stream.testkit.Utils;

akka-stream-tests/src/test/java/akka/stream/io/OutputStreamSourceTest.java

@@ -14,7 +14,7 @@ import org.junit.Test;
 import akka.actor.ActorRef;
 import akka.japi.function.Procedure;
 import akka.stream.StreamTest;
-import akka.stream.javadsl.AkkaJUnitActorSystemResource;
+import akka.testkit.AkkaJUnitActorSystemResource;
 import akka.stream.javadsl.Sink;
 import akka.stream.javadsl.Source;
 import akka.stream.javadsl.StreamConverters;

akka-stream-tests/src/test/java/akka/stream/io/SinkAsJavaSourceTest.java

@@ -5,7 +5,7 @@ package akka.stream.io;
 
 
 import akka.stream.StreamTest;
-import akka.stream.javadsl.AkkaJUnitActorSystemResource;
+import akka.testkit.AkkaJUnitActorSystemResource;
 import akka.stream.javadsl.Sink;
 import akka.stream.javadsl.Source;
 import akka.stream.javadsl.StreamConverters;

akka-stream-tests/src/test/java/akka/stream/javadsl/AkkaJUnitActorSystemResource.java

@@ -1,84 +0,0 @@
-/**
- * Copyright (C) 2009-2016 Lightbend Inc. <http://www.lightbend.com>
- */
-package akka.stream.javadsl;
-
-import org.junit.rules.ExternalResource;
-
-import akka.actor.ActorSystem;
-import akka.testkit.AkkaSpec;
-import akka.testkit.JavaTestKit;
-
-import com.typesafe.config.Config;
-
-// FIXME remove this copy, and use akka.testkit.AkkaJUnitActorSystemResource when
-//       akka-stream-experimental becomes a normal build project
-
-/**
- * This is a resource for creating an actor system before test start and shut it
- * down afterwards.
- * 
- * To use it on a class level add this to your test class:
- * 
- * @ClassRule public static AkkaJUnitActorSystemResource actorSystemResource =
- *            new AkkaJUnitActorSystemResource(name, config);
- * 
- *            private final ActorSystem system =
- *            actorSystemResource.getSystem();
- * 
- * 
- *            To use it on a per test level add this to your test class:
- * 
- * @Rule public AkkaJUnitActorSystemResource actorSystemResource = new
- *       AkkaJUnitActorSystemResource(name, config);
- * 
- *       private final ActorSystem system = actorSystemResource.getSystem();
- */
-
-public class AkkaJUnitActorSystemResource extends ExternalResource {
-  private ActorSystem system = null;
-  private final String name;
-  private final Config config;
-
-  private ActorSystem createSystem(String name, Config config) {
-    try {
-      if (config == null)
-        return ActorSystem.create(name);
-      else
-        return ActorSystem.create(name, config);
-    } catch (Exception e) {
-      e.printStackTrace();
-      return null;
-    }
-  }
-
-  public AkkaJUnitActorSystemResource(String name, Config config) {
-    this.name = name;
-    this.config = config;
-    system = createSystem(name, config);
-  }
-
-  public AkkaJUnitActorSystemResource(String name) {
-    this(name, AkkaSpec.testConf());
-  }
-
-  @Override
-  protected void before() throws Throwable {
-    // Sometimes the ExternalResource seems to be reused, and
-    // we don't run the constructor again, so if that's the case
-    // then create the system here
-    if (system == null) {
-      system = createSystem(name, config);
-    }
-  }
-
-  @Override
-  protected void after() {
-    JavaTestKit.shutdownActorSystem(system);
-    system = null;
-  }
-
-  public ActorSystem getSystem() {
-    return system;
-  }
-}

akka-stream-tests/src/test/java/akka/stream/javadsl/AttributesTest.java

@@ -14,6 +14,7 @@ import org.junit.Test;
 
 import akka.stream.Attributes;
 import akka.stream.StreamTest;
+import akka.testkit.AkkaJUnitActorSystemResource;
 import akka.testkit.AkkaSpec;
 
 public class AttributesTest extends StreamTest {

akka-stream-tests/src/test/java/akka/stream/javadsl/BidiFlowTest.java

@@ -25,6 +25,7 @@ import akka.japi.function.*;
 import akka.util.ByteString;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertArrayEquals;
+import akka.testkit.AkkaJUnitActorSystemResource;
 
 public class BidiFlowTest extends StreamTest {
   public BidiFlowTest() {

akka-stream-tests/src/test/java/akka/stream/javadsl/FlowTest.java

@@ -26,6 +26,7 @@ import scala.concurrent.Await;
 import scala.concurrent.Future;
 import scala.concurrent.duration.Duration;
 import scala.concurrent.duration.FiniteDuration;
+import akka.testkit.AkkaJUnitActorSystemResource;
 
 import java.util.*;
 import java.util.concurrent.CompletableFuture;

akka-stream-tests/src/test/java/akka/stream/javadsl/FlowThrottleTest.java

@@ -16,6 +16,7 @@ import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.CompletionStage;
 import java.util.concurrent.TimeUnit;
 import akka.testkit.AkkaSpec;
+import akka.testkit.AkkaJUnitActorSystemResource;
 
 import static org.junit.Assert.assertEquals;
 

akka-stream-tests/src/test/java/akka/stream/javadsl/FramingTest.java

@@ -9,6 +9,7 @@ import akka.testkit.AkkaSpec;
 import akka.util.ByteString;
 import org.junit.ClassRule;
 import org.junit.Test;
+import akka.testkit.AkkaJUnitActorSystemResource;
 
 public class FramingTest extends StreamTest {
   public FramingTest() {

akka-stream-tests/src/test/java/akka/stream/javadsl/GraphDSLTest.java

@@ -14,6 +14,7 @@ import akka.japi.function.*;
 import akka.testkit.AkkaSpec;
 import akka.testkit.JavaTestKit;
 import akka.testkit.TestProbe;
+import akka.testkit.AkkaJUnitActorSystemResource;
 
 import org.junit.ClassRule;
 import org.junit.Test;

akka-stream-tests/src/test/java/akka/stream/javadsl/KillSwitchTest.java

@@ -11,6 +11,7 @@ import org.junit.Test;
 
 import java.util.concurrent.CompletionStage;
 import java.util.concurrent.TimeUnit;
+import akka.testkit.AkkaJUnitActorSystemResource;
 
 import static org.junit.Assert.*;
 

akka-stream-tests/src/test/java/akka/stream/javadsl/SinkTest.java

@@ -24,6 +24,7 @@ import scala.concurrent.duration.Duration;
 import akka.japi.function.Function2;
 import akka.testkit.AkkaSpec;
 import akka.testkit.JavaTestKit;
+import akka.testkit.AkkaJUnitActorSystemResource;
 
 import static org.junit.Assert.*;
 

akka-stream-tests/src/test/java/akka/stream/javadsl/SourceTest.java

@@ -28,6 +28,7 @@ import scala.concurrent.Future;
 import scala.concurrent.duration.Duration;
 import scala.concurrent.duration.FiniteDuration;
 import scala.util.Try;
+import akka.testkit.AkkaJUnitActorSystemResource;
 
 import java.util.*;
 import java.util.concurrent.CompletableFuture;

akka-stream-tests/src/test/java/akka/stream/javadsl/TcpTest.java

@@ -29,6 +29,7 @@ import akka.testkit.AkkaSpec;
 import akka.stream.testkit.TestUtils;
 import akka.util.ByteString;
 import akka.testkit.JavaTestKit;
+import akka.testkit.AkkaJUnitActorSystemResource;
 
 public class TcpTest extends StreamTest {
   public TcpTest() {

akka-stream-tests/src/test/java/akka/stream/stage/StageTest.java

@@ -5,7 +5,7 @@ package akka.stream.stage;
 
 import akka.NotUsed;
 import akka.stream.StreamTest;
-import akka.stream.javadsl.AkkaJUnitActorSystemResource;
+import akka.testkit.AkkaJUnitActorSystemResource;
 import akka.stream.javadsl.Sink;
 import akka.stream.javadsl.Source;
 import akka.testkit.AkkaSpec;

akka-testkit/src/test/java/akka/testkit/AkkaJUnitActorSystemResource.java

@@ -4,28 +4,44 @@
 package akka.testkit;
 
 import akka.actor.ActorSystem;
+
 import com.typesafe.config.Config;
 import org.junit.rules.ExternalResource;
 
 /**
- * This is a resource for creating an actor system before test start and shut it down afterwards.
+ * This is a resource for creating an actor system before test start and shut it
+ * down afterwards.
  *
  * To use it on a class level add this to your test class:
  *
- * @ClassRule
+ * <code>
+ * &#64;ClassRule
  * public static AkkaJUnitActorSystemResource actorSystemResource =
  *   new AkkaJUnitActorSystemResource(name, config);
  *
  * private final ActorSystem system = actorSystemResource.getSystem();
+ * </code>
  *
  *
- * To use it on a per test level add this to your test class:
+ *            To use it on a per test level add this to your test class:
  *
- * @Rule
+ *            <code>
+ * &#64;Rule
  * public AkkaJUnitActorSystemResource actorSystemResource =
  *   new AkkaJUnitActorSystemResource(name, config);
  *
- * private final ActorSystem system = actorSystemResource.getSystem();
+ * private ActorSystem system = null;
+ *
+ * &#64;Before
+ * public void beforeEach() {
+ *   system = actorSystemResource.getSystem();
+ * }
+ * </code>
+ *
+ *         Note that it is important to not use <code>getSystem</code> from the
+ *         constructor of the test, becuase some test runners may create an
+ *         instance of the class without actually using it later, resulting in
+ *         memory leaks because of not shutting down the actor system.
  */
 
 public class AkkaJUnitActorSystemResource extends ExternalResource {
@@ -49,7 +65,6 @@ public class AkkaJUnitActorSystemResource extends ExternalResource {
   public AkkaJUnitActorSystemResource(String name, Config config) {
     this.name = name;
     this.config = config;
-    system = createSystem(name, config);
   }
 
   public AkkaJUnitActorSystemResource(String name) {
@@ -58,9 +73,6 @@ public class AkkaJUnitActorSystemResource extends ExternalResource {
 
   @Override
   protected void before() throws Throwable {
-    // Sometimes the ExternalResource seems to be reused, and
-    // we don't run the constructor again, so if that's the case
-    // then create the system here
     if (system == null) {
       system = createSystem(name, config);
     }
@@ -73,6 +85,9 @@ public class AkkaJUnitActorSystemResource extends ExternalResource {
   }
 
   public ActorSystem getSystem() {
+    if (system == null) {
+      system = createSystem(name, config);
+    }
     return system;
   }
 }

akka-typed/src/test/scala/akka/typed/TypedSpec.scala

@@ -25,13 +25,13 @@ import org.scalactic.Constraint
 /**
  * Helper class for writing tests for typed Actors with ScalaTest.
  */
-class TypedSpec(config: Config) extends Spec with Matchers with BeforeAndAfterAll with ScalaFutures with ConversionCheckedTripleEquals {
+abstract class TypedSpec(config: Config) extends Spec with Matchers with BeforeAndAfterAll with ScalaFutures with ConversionCheckedTripleEquals {
   import TypedSpec._
   import AskPattern._
 
   def this() = this(ConfigFactory.empty)
 
-  implicit val system = ActorSystem(AkkaSpec.getCallerName(classOf[TypedSpec]), Props(guardian()), Some(config withFallback AkkaSpec.testConf))
+  implicit val system = ActorSystem(TypedSpec.getCallerName(classOf[TypedSpec]), Props(guardian()), Some(config withFallback AkkaSpec.testConf))
 
   implicit val timeout = Timeout(1.minute)
   implicit val patience = PatienceConfig(3.seconds)
@@ -146,4 +146,14 @@ object TypedSpec {
         c.replyTo ! ctx.spawn(c.props, c.name)
         Same
     }
+
+  def getCallerName(clazz: Class[_]): String = {
+    val s = (Thread.currentThread.getStackTrace map (_.getClassName) drop 1)
+      .dropWhile(_ matches "(java.lang.Thread|.*TypedSpec.?$)")
+    val reduced = s.lastIndexWhere(_ == clazz.getName) match {
+      case -1 ⇒ s
+      case z  ⇒ s drop (z + 1)
+    }
+    reduced.head.replaceFirst(""".*\.""", "").replaceAll("[^a-zA-Z_0-9]", "_")
+  }
 }