diff -r 7e8e5ceecf99 -r 0553e129e0ec hotspot/test/runtime/modules/java.base/java/lang/ModuleHelper.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/runtime/modules/java.base/java/lang/ModuleHelper.java	Fri Apr 07 08:04:46 2017 +0000
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2015, 2017, 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.
+ *
+ * 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 java.lang;
+
+import java.lang.module.ModuleDescriptor;
+
+/**
+ * A helper class intended to be injected into java.lang using the
+ * java --patch-module option. The helper class provides access to package private
+ * methods in java.lang.Module.
+ */
+
+public final class ModuleHelper {
+
+    private ModuleHelper() { }
+
+    /**
+     * Creates a named module but without defining the module to the VM.
+     */
+    public static Module newModule(ClassLoader loader, ModuleDescriptor descriptor) {
+        return new Module(loader, descriptor);
+    }
+
+    /**
+     * Updates module {@code from} to that it reads module {@code to} without
+     * notifying the VM.
+     */
+    public static void addReadsNoSync(Module from, Module to) {
+        from.implAddReadsNoSync(to);
+    }
+
+    /**
+     * Updates module {@code from} so that it exports package {@code pkg}
+     * to module {@code to} but without notifying the VM. If {@code to} is
+     * {@code null} then the package is exported unconditionally.
+     */
+    public static void addExportsNoSync(Module from, String pkg, Module to) {
+        if (to == null) {
+            from.implAddExportsNoSync(pkg);
+        } else {
+            from.implAddExportsNoSync(pkg, to);
+        }
+    }
+
+    /**
+     * Adds a package to a module without notifying the VM.
+     */
+    public static void addPackageNoSync(Module m, String pkg) {
+        m.implAddPackageNoSync(pkg);
+    }
+
+}