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

*** 46,55 ****
--- 46,56 ----
   * @author Laurence P. G. Cable
   * @since  1.1
   */
  
  public class TooManyListenersException extends Exception {
+     @java.io.Serial
      private static final long serialVersionUID = 5074640544770687831L;
  
      /**
       * Constructs a TooManyListenersException with no detail message.
       * A detail message is a String that describes this particular exception.