src/java.base/share/classes/java/lang/CloneNotSupportedException.java

@@ -41,10 +41,11 @@
  * @since   1.0
  */
 
 public
 class CloneNotSupportedException extends Exception {
+    @java.io.Serial
     private static final long serialVersionUID = 5195511250079656443L;
 
     /**
      * Constructs a <code>CloneNotSupportedException</code> with no
      * detail message.