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

*** 639,648 ****
--- 639,649 ----
       * Implementation of a clock that adds an offset to an underlying clock.
       */
      static final class OffsetClock extends Clock implements Serializable {
          @java.io.Serial
          private static final long serialVersionUID = 2007484719125426256L;
+         @SuppressWarnings("serial") // Not statically typed as Serializable
          private final Clock baseClock;
          private final Duration offset;
  
          OffsetClock(Clock baseClock, Duration offset) {
              this.baseClock = baseClock;
*** 690,699 ****
--- 691,701 ----
       * Implementation of a clock that adds an offset to an underlying clock.
       */
      static final class TickClock extends Clock implements Serializable {
          @java.io.Serial
          private static final long serialVersionUID = 6504659149906368850L;
+         @SuppressWarnings("serial") // Not statically typed as Serializable
          private final Clock baseClock;
          private final long tickNanos;
  
          TickClock(Clock baseClock, long tickNanos) {
              this.baseClock = baseClock;