--- old/src/java.base/share/classes/java/nio/file/FileSystemLoopException.java	2019-08-27 17:28:14.386324386 -0700
+++ new/src/java.base/share/classes/java/nio/file/FileSystemLoopException.java	2019-08-27 17:28:14.222324386 -0700
@@ -35,6 +35,7 @@
 public class FileSystemLoopException
     extends FileSystemException
 {
+    @java.io.Serial
     private static final long serialVersionUID = 4843039591949217617L;
 
     /**