first commit (#11683)

core-java-modules/core-java-concurrency-basic-2/src/main/java/com/baeldung/concurrent/waitandnotify/Data.java

@@ -17,9 +17,10 @@ public class Data {
             }
         }
         transfer = true;
-
+        
+        String returnPacket = packet;
         notifyAll();
-        return packet;
+        return returnPacket;
     }
  
     public synchronized void send(String packet) {