--- old/src/java.base/share/classes/java/util/MissingResourceException.java	2019-08-27 17:29:08.430324386 -0700
+++ new/src/java.base/share/classes/java/util/MissingResourceException.java	2019-08-27 17:29:08.254324386 -0700
@@ -108,6 +108,7 @@
     //============ privates ============
 
     // serialization compatibility with JDK1.1
+    @java.io.Serial
     private static final long serialVersionUID = -4876345176062000401L;
 
     /**