--- /dev/null	2019-12-04 18:44:18.020007537 +0000
+++ new/src/java.base/share/classes/jdk/internal/access/foreign/UnmapperProxy.java	2019-12-09 18:15:24.927909753 +0000
@@ -0,0 +1,36 @@
+/*
+ *  Copyright (c) 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
+ *  under the terms of the GNU General Public License version 2 only, as
+ *  published by the Free Software Foundation.  Oracle designates this
+ *  particular file as subject to the "Classpath" exception as provided
+ *  by Oracle in the LICENSE file that accompanied this code.
+ *
+ *  This code is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  version 2 for more details (a copy is included in the LICENSE file that
+ *  accompanied this code).
+ *
+ *  You should have received a copy of the GNU General Public License version
+ *  2 along with this work; if not, write to the Free Software Foundation,
+ *  Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ *   Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ *  or visit www.oracle.com if you need additional information or have any
+ *  questions.
+ *
+ */
+
+package jdk.internal.access.foreign;
+
+/**
+ * This proxy interface is required to allow instances of the {@code FileChannelImpl.Unmapper} interface (which is a non-public class
+ * inside the {@code sun.nio.ch} package) to be accessed from the mapped memory segment factory.
+ */
+public interface UnmapperProxy {
+    long address();
+    void unmap();
+}