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

*** 35,44 ****
--- 35,45 ----
   * @since 1.5
   */
  public class FormatFlagsConversionMismatchException
      extends IllegalFormatException
  {
+     @java.io.Serial
      private static final long serialVersionUID = 19120414L;
  
      private String f;
  
      private char c;