src/java.base/windows/classes/sun/nio/fs/WindowsFileCopy.java

*** 1,7 ****
  /*
!  * Copyright (c) 2008, 2016, 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
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
--- 1,7 ----
  /*
!  * Copyright (c) 2008, 2018, 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
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
*** 247,256 ****
--- 247,267 ----
                  copySecurityAttributes(source, target, followLinks);
              } catch (IOException ignore) { }
          }
      }
  
+     // throw a DirectoryNotEmpty exception if not empty
+     static void ensureEmptyDir(WindowsPath dir) throws IOException {
+         try (WindowsDirectoryStream dirStream =
+             new WindowsDirectoryStream(dir, (e) -> true)) {
+             if (dirStream.iterator().hasNext()) {
+                 throw new DirectoryNotEmptyException(
+                     dir.getPathForExceptionMessage());
+             }
+         }
+     }
+ 
      /**
       * Move file from source to target
       */
      static void move(WindowsPath source, WindowsPath target, CopyOption... options)
          throws IOException
*** 405,414 ****
--- 416,426 ----
          assert sourceAttrs.isDirectory() || sourceAttrs.isDirectoryLink();
  
          // create new directory or directory junction
          try {
              if (sourceAttrs.isDirectory()) {
+                 ensureEmptyDir(source);
                  CreateDirectory(targetPath, 0L);
              } else {
                  String linkTarget = WindowsLinkSupport.readLink(source);
                  CreateSymbolicLink(targetPath,
                                     WindowsPath.addPrefixIfNeeded(linkTarget),