--- /dev/null	2016-11-28 16:41:16.931609629 -0500
+++ new/test/runtime/modules/AccessCheck/AccessTwice.java	2016-12-09 09:45:09.948877524 -0500
@@ -0,0 +1,133 @@
+/*
+ * Copyright (c) 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.
+ *
+ * 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.
+ */
+/*
+ * @test
+ * @summary Class p1.c1 in an unnamed module cannot read p2.c2 in module second_mod,
+ *          even after p2 is exported to all unnamed.
+ * @library /test/lib
+ * @modules java.base/jdk.internal.misc
+ * @modules java.base/jdk.internal.module
+ * @compile myloaders/MySameClassLoader.java
+ * @compile p2/c2.java
+ * @compile p1/c1.java
+ * @run main/othervm AccessTwice
+ */
+
+import static jdk.test.lib.Asserts.*;
+
+import java.lang.module.Configuration;
+import java.lang.module.ModuleDescriptor;
+import java.lang.module.ModuleFinder;
+import java.lang.reflect.Layer;
+import java.lang.reflect.Module;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Set;
+import myloaders.MySameClassLoader;
+
+//
+// ClassLoader1 --> defines first_mod --> no packages
+//                  defines second_mod --> packages p2
+//
+// first_mod can read second_mod
+// package p2 in second_mod is exported to first_mod
+//
+// class p1.c1 defined in an unnamed module tries to access p2.c2 defined in second_mod
+// Access is not allowed, even after p2 is exported to all unnamed modules.
+
+public class AccessTwice {
+
+    // Create a Layer over the boot layer.
+    // Define modules within this layer to test access between
+    // publicly defined classes within packages of those modules.
+    public void createLayerOnBoot() throws Throwable {
+
+        // Define module:     first_mod
+        // Can read:          java.base, second_mod
+        // Packages:          none
+        // Packages exported: none
+        ModuleDescriptor descriptor_first_mod =
+                new ModuleDescriptor.Builder("first_mod")
+                        .requires("java.base")
+                        .requires("second_mod")
+                        .build();
+
+        // Define module:     second_mod
+        // Can read:          java.base
+        // Packages:          p2
+        // Packages exported: p2 is exported to first_mod
+        ModuleDescriptor descriptor_second_mod =
+                new ModuleDescriptor.Builder("second_mod")
+                        .requires("java.base")
+                        .exports("p2", "first_mod")
+                        .build();
+
+        // Set up a ModuleFinder containing all modules for this layer
+        ModuleFinder finder = ModuleLibrary.of(descriptor_first_mod, descriptor_second_mod);
+
+        // Resolves "first_mod"
+        Configuration cf = Layer.boot()
+                .configuration()
+                .resolveRequires(finder, ModuleFinder.of(), Set.of("first_mod"));
+
+        // Map each module to the same class loader
+        Map<String, ClassLoader> map = new HashMap<>();
+        map.put("first_mod", MySameClassLoader.loader1);
+        map.put("second_mod", MySameClassLoader.loader1);
+
+        // Create Layer that contains first_mod & second_mod
+        Layer layer = Layer.boot().defineModules(cf, map::get);
+
+        assertTrue(layer.findLoader("first_mod") == MySameClassLoader.loader1);
+        assertTrue(layer.findLoader("second_mod") == MySameClassLoader.loader1);
+        assertTrue(layer.findLoader("java.base") == null);
+
+        Class p2_c2_class = MySameClassLoader.loader1.loadClass("p2.c2");
+        // Use the same loader to load class p1.c1
+        Class p1_c1_class = MySameClassLoader.loader1.loadClass("p1.c1");
+        // First access check for p1.c1
+        try {
+            p1_c1_class.newInstance();
+            throw new RuntimeException("Test Failed, the unnamed module should not have access to public type p2.c2");
+        } catch (IllegalAccessError e) {
+            System.out.println("Test Succeeded at attempt #1");
+        }
+
+        // Export second_mod/p2 to all unnamed modules.
+        Module second_mod = p2_c2_class.getModule();
+        jdk.internal.module.Modules.addExportsToAllUnnamed(second_mod, "p2");
+
+        // Second access check for p1.c1, should have same result as first
+        try {
+            p1_c1_class.newInstance();
+            throw new RuntimeException("Test Failed, access should have been cached above");
+        } catch (IllegalAccessError e) {
+            System.out.println("Test Succeeded at attempt #2");
+        }
+    }
+
+    public static void main(String args[]) throws Throwable {
+      AccessTwice test = new AccessTwice();
+      test.createLayerOnBoot();
+    }
+}