=str #18384 Fix javadsl.Broadcast eagerCancel

* The javadsl for Broadcast should not ignore eagerCancel

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

@@ -589,4 +589,28 @@ public class FlowTest extends StreamTest {
     probe.expectMsgAllOf("A","B","C");
   }
 
+  @Test
+  public void mustBeAbleToBroadcastEagerCancel() throws Exception {
+    final Sink<String, BoxedUnit> out1 = Sink.cancelled();
+    final Sink<String, ?> out2 = Sink.ignore();
+
+    final Sink<String, BoxedUnit> sink = Sink.factory().<String>create(new Function<FlowGraph.Builder<BoxedUnit>, Inlet<String>>() {
+      @Override
+      public Inlet<String> apply(Builder<BoxedUnit> b) throws Exception {
+        final UniformFanOutShape<String, String> broadcast = b.graph(Broadcast.<String>create(2, true));
+
+        b.from(broadcast.out(0)).to(out1);
+        b.from(broadcast.out(1)).to(out2);
+        return broadcast.in();
+      }
+    });
+
+    final JavaTestKit probe = new JavaTestKit(system);
+    Source<String, ActorRef> source = Source.actorRef(1, OverflowStrategy.dropNew());
+    final ActorRef actor = source.toMat(sink, Keep.<ActorRef, BoxedUnit>left()).run(materializer);
+    probe.watch(actor);
+    probe.expectTerminated(actor);
+  }
+
+
 }

akka-stream/src/main/scala/akka/stream/javadsl/Graph.scala

@@ -103,7 +103,7 @@ object Broadcast {
    * @param eagerCancel if true, broadcast cancels upstream if any of its downstreams cancel.
    */
   def create[T](outputCount: Int, eagerCancel: Boolean): Graph[UniformFanOutShape[T, T], Unit] =
-    scaladsl.Broadcast(outputCount)
+    scaladsl.Broadcast(outputCount, eagerCancel = eagerCancel)
 
   /**
    * Create a new `Broadcast` vertex with the specified input type.