--- old/src/java.base/share/classes/java/nio/file/FileSystemException.java	2019-08-27 17:28:13.910324386 -0700
+++ new/src/java.base/share/classes/java/nio/file/FileSystemException.java	2019-08-27 17:28:13.718324386 -0700
@@ -37,6 +37,7 @@
 public class FileSystemException
     extends IOException
 {
+    @java.io.Serial
     static final long serialVersionUID = -3055425747967319812L;
 
     private final String file;