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

@@ -34,10 +34,11 @@
  *
  * @author  Arthur van Hoff
  * @since   1.0
  */
 public class MalformedURLException extends IOException {
+    @java.io.Serial
     private static final long serialVersionUID = -182787522200415866L;
 
     /**
      * Constructs a {@code MalformedURLException} with no detail message.
      */