--- old/src/java.base/share/classes/java/nio/file/DirectoryIteratorException.java	2019-08-27 17:28:11.806324386 -0700
+++ new/src/java.base/share/classes/java/nio/file/DirectoryIteratorException.java	2019-08-27 17:28:11.622324386 -0700
@@ -43,6 +43,7 @@
 public final class DirectoryIteratorException
     extends ConcurrentModificationException
 {
+    @java.io.Serial
     private static final long serialVersionUID = -6012699886086212874L;
 
     /**
@@ -76,6 +77,7 @@
      *          if the object is invalid or has a cause that is not
      *          an {@code IOException}
      */
+    @java.io.Serial
     private void readObject(ObjectInputStream s)
         throws IOException, ClassNotFoundException
     {