--- old/src/java.base/share/classes/java/io/NotSerializableException.java	2019-08-27 17:26:53.194324386 -0700
+++ new/src/java.base/share/classes/java/io/NotSerializableException.java	2019-08-27 17:26:52.974324386 -0700
@@ -35,6 +35,7 @@
  */
 public class NotSerializableException extends ObjectStreamException {
 
+    @java.io.Serial
     private static final long serialVersionUID = 2906642554793891381L;
 
     /**