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

@@ -36,10 +36,11 @@
  *
  * @since 1.5
  */
 public class IllegalFormatCodePointException extends IllegalFormatException {
 
+    @java.io.Serial
     private static final long serialVersionUID = 19080630L;
 
     private int c;
 
     /**