diff -r 6845bb645be5 -r 2f5e556a6037 hotspot/test/runtime/jni/ReturnJNIWeak/ReturnJNIWeak.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/runtime/jni/ReturnJNIWeak/ReturnJNIWeak.java	Wed Feb 15 22:19:13 2017 -0500
@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 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.
+ */
+
+/* @test
+ * @bug 8166188
+ * @requires vm.opt.ExplicitGCInvokesConcurrent != true
+ * @summary Test return of JNI weak global refs from native calls.
+ * @modules java.base
+ * @run main/othervm/native -Xint ReturnJNIWeak
+ * @run main/othervm/native -Xcomp ReturnJNIWeak
+ */
+
+public final class ReturnJNIWeak {
+
+    static {
+        System.loadLibrary("ReturnJNIWeak");
+    }
+
+    private static final class TestObject {
+        public final int value;
+
+        public TestObject(int value) {
+            this.value = value;
+        }
+    }
+
+    private static volatile TestObject testObject = null;
+
+    private static native void registerObject(Object o);
+    private static native void unregisterObject();
+    private static native Object getObject();
+
+    // Create the test object and record it both strongly and weakly.
+    private static void remember(int value) {
+        TestObject o = new TestObject(value);
+        registerObject(o);
+        testObject = o;
+    }
+
+    // Remove both strong and weak references to the current test object.
+    private static void forget() {
+        unregisterObject();
+        testObject = null;
+    }
+
+    // Verify the weakly recorded object
+    private static void checkValue(int value) throws Exception {
+        Object o = getObject();
+        if (o == null) {
+            throw new RuntimeException("Weak reference unexpectedly null");
+        }
+        TestObject t = (TestObject)o;
+        if (t.value != value) {
+            throw new RuntimeException("Incorrect value");
+        }
+    }
+
+    // Verify we can create a weak reference and get it back.
+    private static void testSanity() throws Exception {
+        System.out.println("running testSanity");
+        int value = 5;
+        try {
+            remember(value);
+            checkValue(value);
+        } finally {
+            forget();
+        }
+    }
+
+    // Verify weak ref value survives across collection if strong ref exists.
+    private static void testSurvival() throws Exception {
+        System.out.println("running testSurvival");
+        int value = 10;
+        try {
+            remember(value);
+            checkValue(value);
+            System.gc();
+            // Verify weak ref still has expected value.
+            checkValue(value);
+        } finally {
+            forget();
+        }
+    }
+
+    // Verify weak ref cleared if no strong ref exists.
+    private static void testClear() throws Exception {
+        System.out.println("running testClear");
+        int value = 15;
+        try {
+          remember(value);
+          checkValue(value);
+          // Verify still good.
+          checkValue(value);
+          // Drop reference.
+          testObject = null;
+          System.gc();
+          // Verify weak ref cleared as expected.
+          Object recorded = getObject();
+          if (recorded != null) {
+            throw new RuntimeException("expected clear");
+          }
+        } finally {
+          forget();
+        }
+    }
+
+    public static void main(String[] args) throws Exception {
+        testSanity();
+        testSurvival();
+        testClear();
+    }
+}