--- old/src/java.base/share/classes/java/io/FileNotFoundException.java	2019-08-27 17:26:48.582324386 -0700
+++ new/src/java.base/share/classes/java/io/FileNotFoundException.java	2019-08-27 17:26:48.406324386 -0700
@@ -41,6 +41,7 @@
  */
 
 public class FileNotFoundException extends IOException {
+    @java.io.Serial
     private static final long serialVersionUID = -897856973823710492L;
 
     /**