--- old/src/windows/classes/sun/nio/ch/FileDispatcherImpl.java	2018-02-02 03:17:01.027317324 -0500
+++ new/src/windows/classes/sun/nio/ch/FileDispatcherImpl.java	2018-02-02 03:17:00.904317329 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 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
@@ -93,6 +93,11 @@
         return truncate0(fd, size);
     }
 
+    int allocate(FileDescriptor fd, long size) throws IOException {
+        // truncate0() works for extending and truncating file size
+        return truncate0(fd, size);
+    }
+
     long size(FileDescriptor fd) throws IOException {
         return size0(fd);
     }