src/java.base/share/classes/java/util/IllegalFormatFlagsException.java

*** 34,43 ****
--- 34,44 ----
   *
   * @since 1.5
   */
  public class IllegalFormatFlagsException extends IllegalFormatException {
  
+     @java.io.Serial
      private static final long serialVersionUID = 790824L;
  
      private String flags;
  
      /**