--- old/src/java.base/share/classes/java/time/LocalDate.java	2019-08-27 17:28:28.118324386 -0700
+++ new/src/java.base/share/classes/java/time/LocalDate.java	2019-08-27 17:28:27.930324386 -0700
@@ -157,6 +157,7 @@
     /**
      * Serialization version.
      */
+    @java.io.Serial
     private static final long serialVersionUID = 2942565459149668126L;
     /**
      * The number of days in a 400 year cycle.
@@ -2200,6 +2201,7 @@
      *
      * @return the instance of {@code Ser}, not null
      */
+    @java.io.Serial
     private Object writeReplace() {
         return new Ser(Ser.LOCAL_DATE_TYPE, this);
     }
@@ -2210,6 +2212,7 @@
      * @param s the stream to read
      * @throws InvalidObjectException always
      */
+    @java.io.Serial
     private void readObject(ObjectInputStream s) throws InvalidObjectException {
         throw new InvalidObjectException("Deserialization via serialization delegate");
     }