Documentation improvements

* Re enabling Java tests in akka-docs (they were not run before)
* Fixed bug #19764
* #19735 Rewrote every sample using the deprecated PushPullStage and friends
  using GraphStage
* Pruned old unused graph images
* Added missing graffle file for new graph images

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

@@ -11,6 +11,8 @@ import akka.testkit.EventFilter;
 import akka.testkit.TestEvent;
 import com.typesafe.config.Config;
 import com.typesafe.config.ConfigFactory;
+import docs.AbstractJavaTest;
+import org.scalatest.junit.JUnitSuite;
 import scala.PartialFunction;
 import scala.runtime.BoxedUnit;
 import static docs.actor.Messages.Swap.Swap;
@@ -44,7 +46,7 @@ import scala.concurrent.Future;
 import static akka.pattern.Patterns.gracefulStop;
 //#import-graceFulStop
 
-public class ActorDocTest {
+public class ActorDocTest extends AbstractJavaTest {
 
   public static Config config = ConfigFactory.parseString(
     "akka {\n" +
@@ -323,7 +325,7 @@ public class ActorDocTest {
     //#system-actorOf
     // ActorSystem is a heavy object: create only one per application
     final ActorSystem system = ActorSystem.create("MySystem", config);
-    final ActorRef myActor = system.actorOf(Props.create(MyActor.class), "myactor");
+    final ActorRef myActor = system.actorOf(Props.create(FirstActor.class), "myactor");
     //#system-actorOf
     try {
       new JavaTestKit(system) {

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

@@ -20,8 +20,9 @@ import akka.actor.Props;
 import akka.testkit.JavaTestKit;
 import akka.testkit.TestProbe;
 import akka.testkit.AkkaSpec;
+import docs.AbstractJavaTest;
 
-public class FSMDocTest {
+public class FSMDocTest extends AbstractJavaTest {
 
   static
   //#data

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

@@ -16,6 +16,7 @@ import akka.actor.OneForOneStrategy;
 import akka.actor.Props;
 import akka.actor.Terminated;
 import akka.actor.UntypedActor;
+import docs.AbstractJavaTest;
 import scala.collection.immutable.Seq;
 import scala.concurrent.Await;
 import static akka.pattern.Patterns.ask;
@@ -37,7 +38,7 @@ import org.junit.BeforeClass;
 import org.junit.AfterClass;
 
 //#testkit
-public class FaultHandlingTest {
+public class FaultHandlingTest extends AbstractJavaTest {
   //#testkit
   static
   //#supervisor

akka-docs/rst/java/code/docs/actor/FaultHandlingTestJava8.java

@@ -14,6 +14,7 @@ import akka.japi.pf.DeciderBuilder;
 import akka.japi.pf.ReceiveBuilder;
 import com.typesafe.config.Config;
 import com.typesafe.config.ConfigFactory;
+import org.scalatest.junit.JUnitSuite;
 import scala.PartialFunction;
 import scala.concurrent.Await;
 import static akka.pattern.Patterns.ask;
@@ -35,7 +36,7 @@ import org.junit.AfterClass;
 import scala.runtime.BoxedUnit;
 
 //#testkit
-public class FaultHandlingTestJava8 {
+public class FaultHandlingTestJava8 extends JUnitSuite {
 //#testkit
 
   public static Config config = ConfigFactory.parseString(

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

@@ -7,6 +7,7 @@ package docs.actor;
 import java.util.concurrent.TimeUnit;
 
 import akka.testkit.AkkaJUnitActorSystemResource;
+import docs.AbstractJavaTest;
 import org.junit.ClassRule;
 import org.junit.Test;
 
@@ -19,7 +20,7 @@ import akka.actor.Terminated;
 import akka.testkit.AkkaSpec;
 import akka.testkit.JavaTestKit;
 
-public class InboxDocTest {
+public class InboxDocTest extends AbstractJavaTest {
 
   @ClassRule
   public static AkkaJUnitActorSystemResource actorSystemResource =

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

@@ -7,11 +7,12 @@ import akka.actor.*;
 import akka.japi.Procedure;
 import akka.testkit.AkkaJUnitActorSystemResource;
 import akka.testkit.JavaTestKit;
+import docs.AbstractJavaTest;
 import org.junit.ClassRule;
 import org.junit.Test;
 import scala.Option;
 
-public class InitializationDocSpecJava {
+public class InitializationDocSpecJava extends AbstractJavaTest {
 
   static public class PreStartInitExample extends UntypedActor {
 

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

@@ -7,6 +7,7 @@ package docs.actor;
 import akka.actor.*;
 import akka.japi.pf.ReceiveBuilder;
 import akka.testkit.JavaTestKit;
+import docs.AbstractJavaTest;
 import org.junit.AfterClass;
 import org.junit.BeforeClass;
 import org.junit.Test;
@@ -17,7 +18,7 @@ import scala.concurrent.Await;
 
 import java.util.concurrent.TimeUnit;
 
-public class InitializationDocTest {
+public class InitializationDocTest extends AbstractJavaTest {
 
   static ActorSystem system = null;
 

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

@@ -8,13 +8,14 @@ import akka.actor.ActorRef;
 import akka.actor.ActorSystem;
 import akka.actor.Props;
 import akka.testkit.JavaTestKit;
+import docs.AbstractJavaTest;
 import org.junit.AfterClass;
 import org.junit.BeforeClass;
 import org.junit.Test;
 
 import static org.junit.Assert.*;
 
-public class SampleActorTest {
+public class SampleActorTest extends AbstractJavaTest {
 
   static ActorSystem system;
 

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

@@ -5,6 +5,7 @@ package docs.actor;
 
 //#imports1
 import akka.actor.Props;
+import docs.AbstractJavaTest;
 import scala.concurrent.duration.Duration;
 import java.util.concurrent.TimeUnit;
 //#imports1
@@ -20,7 +21,7 @@ import akka.testkit.AkkaSpec;
 import akka.testkit.AkkaJUnitActorSystemResource;
 import org.junit.*;
 
-public class SchedulerDocTest {
+public class SchedulerDocTest extends AbstractJavaTest {
 
   @Rule
   public AkkaJUnitActorSystemResource actorSystemResource =

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

@@ -10,6 +10,7 @@ import akka.actor.*;
 import akka.japi.*;
 import akka.dispatch.Futures;
 
+import docs.AbstractJavaTest;
 import scala.concurrent.Await;
 import scala.concurrent.Future;
 import scala.concurrent.duration.Duration;
@@ -25,7 +26,7 @@ import org.junit.Test;
 import static org.junit.Assert.assertEquals;
 
 //#imports
-public class TypedActorDocTest {
+public class TypedActorDocTest extends AbstractJavaTest {
     Object someReference = null;
     ActorSystem system = null;
 

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

@@ -18,6 +18,7 @@ import java.util.concurrent.TimeUnit;
 
 import akka.testkit.AkkaJUnitActorSystemResource;
 
+import docs.AbstractJavaTest;
 import org.junit.ClassRule;
 import org.junit.Test;
 
@@ -83,7 +84,7 @@ import akka.testkit.JavaTestKit;
 import akka.util.Timeout;
 //#import-ask
 
-public class UntypedActorDocTest {
+public class UntypedActorDocTest extends AbstractJavaTest {
 
   @ClassRule
   public static AkkaJUnitActorSystemResource actorSystemResource =

akka-docs/rst/java/code/docs/actor/fsm/BuncherTest.java

@@ -8,6 +8,7 @@ import akka.actor.ActorRef;
 import akka.actor.ActorSystem;
 import akka.actor.Props;
 import akka.testkit.JavaTestKit;
+import docs.AbstractJavaTest;
 import org.junit.AfterClass;
 import org.junit.BeforeClass;
 import org.junit.Test;
@@ -20,7 +21,7 @@ import static docs.actor.fsm.Events.SetTarget;
 import static docs.actor.fsm.Events.Flush.Flush;
 
 //#test-code
-public class BuncherTest {
+public class BuncherTest extends AbstractJavaTest {
 
   static ActorSystem system;
 

akka-docs/rst/java/code/docs/actor/fsm/FSMDocTest.java

@@ -6,6 +6,7 @@ package docs.actor.fsm;
 
 import akka.actor.*;
 import akka.testkit.JavaTestKit;
+import docs.AbstractJavaTest;
 import org.hamcrest.CoreMatchers;
 import org.junit.AfterClass;
 import org.junit.BeforeClass;
@@ -18,7 +19,7 @@ import static docs.actor.fsm.FSMDocTest.StateType.*;
 import static docs.actor.fsm.FSMDocTest.Messages.*;
 import static java.util.concurrent.TimeUnit.*;
 
-public class FSMDocTest {
+public class FSMDocTest extends AbstractJavaTest {
   static ActorSystem system;
 
   @BeforeClass