--- old/src/jdk.jfr/share/classes/jdk/jfr/internal/tool/Command.java	2019-03-13 16:42:10.492014105 +0900
+++ new/src/jdk.jfr/share/classes/jdk/jfr/internal/tool/Command.java	2019-03-13 16:42:10.249016157 +0900
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -243,7 +243,7 @@
             }
             rad.read(); // try to read 1 byte
         } catch (FileNotFoundException e) {
-            throw new UserDataException("could not find file '" + path + "'");
+            throw new UserDataException("could not open file " + e.getMessage());
         } catch (IOException e) {
             throw new UserDataException("i/o error reading file '" + path + "', " + e.getMessage());
         }