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

*** 133,142 ****
--- 133,143 ----
      public static final JapaneseChronology INSTANCE = new JapaneseChronology();
  
      /**
       * Serialization version.
       */
+     @java.io.Serial
      private static final long serialVersionUID = 459996390165777884L;
  
      //-----------------------------------------------------------------------
      /**
       * Restricted constructor.
*** 514,532 ****
--- 515,535 ----
       * </pre>
       *
       * @return the instance of {@code Ser}, not null
       */
      @Override
+     @java.io.Serial
      Object writeReplace() {
          return super.writeReplace();
      }
  
      /**
       * 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");
      }
  }