src/java.base/share/classes/java/time/chrono/HijrahDate.java

*** 121,130 ****
--- 121,131 ----
          implements ChronoLocalDate, Serializable {
  
      /**
       * Serialization version.
       */
+     @java.io.Serial
      private static final long serialVersionUID = -5207853542612002020L;
      /**
       * The Chronology of this HijrahDate.
       */
      private final transient HijrahChronology chrono;
*** 655,664 ****
--- 656,666 ----
       * Defend against malicious streams.
       *
       * @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");
      }
  
      /**
*** 673,682 ****
--- 675,685 ----
       *  out.writeByte(get(DAY_OF_MONTH));
       * </pre>
       *
       * @return the instance of {@code Ser}, not null
       */
+     @java.io.Serial
      private Object writeReplace() {
          return new Ser(Ser.HIJRAH_DATE_TYPE, this);
      }
  
      void writeExternal(ObjectOutput out) throws IOException {