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

@@ -75,10 +75,11 @@
 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.
      *