src/java.base/share/classes/java/time/LocalTime.java

*** 211,220 ****
--- 211,221 ----
      static final long NANOS_PER_DAY = NANOS_PER_HOUR * HOURS_PER_DAY;
  
      /**
       * Serialization version.
       */
+     @java.io.Serial
      private static final long serialVersionUID = 6414437269572265201L;
  
      /**
       * The hour.
       */
*** 1672,1691 ****
--- 1673,1694 ----
       *  }
       * </pre>
       *
       * @return the instance of {@code Ser}, not null
       */
+     @java.io.Serial
      private Object writeReplace() {
          return new Ser(Ser.LOCAL_TIME_TYPE, this);
      }
  
      /**
       * 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");
      }
  
      void writeExternal(DataOutput out) throws IOException {