--- old/src/java.base/share/classes/sun/util/BuddhistCalendar.java	2019-08-27 17:29:38.422324386 -0700
+++ new/src/java.base/share/classes/sun/util/BuddhistCalendar.java	2019-08-27 17:29:38.230324386 -0700
@@ -39,6 +39,7 @@
 // Class Variables
 //////////////////
 
+    @java.io.Serial
     private static final long serialVersionUID = -8527488697350388578L;
 
     private static final int BUDDHIST_YEAR_OFFSET = 543;
@@ -254,6 +255,7 @@
 
     private transient int yearOffset = BUDDHIST_YEAR_OFFSET;
 
+    @java.io.Serial
     private void readObject(ObjectInputStream stream)
         throws IOException, ClassNotFoundException {
         stream.defaultReadObject();