--- old/src/java.base/share/classes/java/nio/file/FileAlreadyExistsException.java	2019-08-27 17:28:12.922324386 -0700
+++ new/src/java.base/share/classes/java/nio/file/FileAlreadyExistsException.java	2019-08-27 17:28:12.698324386 -0700
@@ -35,6 +35,7 @@
 public class FileAlreadyExistsException
     extends FileSystemException
 {
+    @java.io.Serial
     static final long serialVersionUID = 7579540934498831181L;
 
     /**