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

*** 75,84 ****
--- 75,85 ----
  public class DateTimeException extends RuntimeException {
  
      /**
       * Serialization version.
       */
+     @java.io.Serial
      private static final long serialVersionUID = -1632418723876261839L;
  
      /**
       * Constructs a new date-time exception with the specified message.
       *