src/java.base/share/classes/java/net/UnknownServiceException.java

*** 35,44 ****
--- 35,45 ----
   *
   * @author  unascribed
   * @since   1.0
   */
  public class UnknownServiceException extends IOException {
+     @java.io.Serial
      private static final long serialVersionUID = -4169033248853639508L;
  
      /**
       * Constructs a new {@code UnknownServiceException} with no
       * detail message.