--- old/src/java.base/share/classes/sun/util/calendar/ZoneInfo.java	2019-08-27 17:29:38.902324386 -0700
+++ new/src/java.base/share/classes/sun/util/calendar/ZoneInfo.java	2019-08-27 17:29:38.726324386 -0700
@@ -163,6 +163,7 @@
      */
     private transient boolean dirty = false;
 
+    @java.io.Serial
     private static final long serialVersionUID = 2653134537216586139L;
 
     /**
@@ -726,6 +727,7 @@
          return ZoneInfoFile.getAliasMap();
     }
 
+    @java.io.Serial
     private void readObject(ObjectInputStream stream)
             throws IOException, ClassNotFoundException {
         stream.defaultReadObject();