src/java.base/share/classes/java/nio/file/NotDirectoryException.java

@@ -33,10 +33,11 @@
  */
 
 public class NotDirectoryException
     extends FileSystemException
 {
+    @java.io.Serial
     private static final long serialVersionUID = -9011457427178200199L;
 
     /**
      * Constructs an instance of this class.
      *