--- old/src/java.base/share/classes/java/io/NotActiveException.java	2019-08-27 17:26:52.538324386 -0700
+++ new/src/java.base/share/classes/java/io/NotActiveException.java	2019-08-27 17:26:52.310324386 -0700
@@ -33,6 +33,7 @@
  */
 public class NotActiveException extends ObjectStreamException {
 
+    @java.io.Serial
     private static final long serialVersionUID = -3893467273049808895L;
 
     /**