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

*** 33,42 ****
--- 33,43 ----
   *
   * @since 1.5
   */
  public class IllegalFormatException extends IllegalArgumentException {
  
+     @java.io.Serial
      private static final long serialVersionUID = 18830826L;
  
      // package-private to prevent explicit instantiation
      IllegalFormatException() { }
  }