diff -r b7192797f434 -r c6f8b2c3dc66 src/java.desktop/share/classes/java/awt/MediaTracker.java
--- a/src/java.desktop/share/classes/java/awt/MediaTracker.java	Tue Sep 24 22:57:28 2019 +0100
+++ b/src/java.desktop/share/classes/java/awt/MediaTracker.java	Tue Sep 24 18:25:54 2019 -0700
@@ -185,6 +185,7 @@
      * @see #addImage(Image, int)
      * @see #removeImage(Image)
      */
+    @SuppressWarnings("serial") // Not statically typed as Serializable
     MediaEntry head;
 
     /*
@@ -922,8 +923,10 @@
     }
 }
 
+@SuppressWarnings("serial") // MediaEntry does not have a no-arg ctor
 class ImageMediaEntry extends MediaEntry implements ImageObserver,
 java.io.Serializable {
+    @SuppressWarnings("serial") // Not statically typed as Serializable
     Image image;
     int width;
     int height;