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

@@ -32,10 +32,11 @@
  * if an intermediate router is down.
  *
  * @since   1.1
  */
 public class NoRouteToHostException extends SocketException {
+    @java.io.Serial
     private static final long serialVersionUID = -1897550894873493790L;
 
     /**
      * Constructs a new NoRouteToHostException with the specified detail
      * message as to why the remote host cannot be reached.