--- /dev/null	2016-08-24 15:41:39.598575000 -0400
+++ new/test/runtime/RedefineTests/RedefineInterfaceMethods.java	2016-09-28 23:18:35.773731083 -0400
@@ -0,0 +1,104 @@
+/*
+ * 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
+ * @bug 8081800
+ * @summary Redefine private and default interface methods
+ * @library /test/lib
+ * @modules java.base/jdk.internal.misc
+ * @modules java.compiler
+ *          java.instrument
+ *          jdk.jartool/sun.tools.jar
+ * @run main RedefineClassHelper
+ * @run main/othervm -javaagent:redefineagent.jar -Xlog:redefine+class*=trace RedefineInterfaceMethods
+ */
+public class RedefineInterfaceMethods {
+
+    static final int RET = -2;
+
+    static interface B {
+        int ORIGINAL_RETURN = 1;
+        int NEW_RETURN = 2;
+        private int privateMethod() {
+            return ORIGINAL_RETURN;
+        }
+        public default int defaultMethod() {
+            return privateMethod();
+        }
+    }
+
+    public static String redefinedPrivateMethod =
+        "interface RedefineInterfaceMethods$B {" +
+        "    int ORIGINAL_RETURN = 1;" +
+        "    int NEW_RETURN = 2;" +
+        "    private int privateMethod() {" +
+        "        return NEW_RETURN;" +
+        "    }" +
+        "    public default int defaultMethod() {" +
+        "       return privateMethod();" +
+        "    }" +
+        "}";
+
+    public static String redefinedDefaultMethod =
+        "interface RedefineInterfaceMethods$B {" +
+        "    int ORIGINAL_RETURN = 1;" +
+        "    int NEW_RETURN = 2;" +
+        "    private int privateMethod() {" +
+        "        return ORIGINAL_RETURN;" +
+        "    }" +
+        "    public default int defaultMethod() {" +
+        "       return RedefineInterfaceMethods.RET;" +
+        "    }" +
+        "}";
+
+    static class Impl implements B {
+    }
+
+
+    public static void main(String[] args) throws Exception {
+
+        Impl impl = new Impl();
+
+        int res = impl.defaultMethod();
+        if (res != B.ORIGINAL_RETURN)
+            throw new Error("defaultMethod returned " + res +
+                            " expected " + B.ORIGINAL_RETURN);
+
+        RedefineClassHelper.redefineClass(B.class, redefinedPrivateMethod);
+
+        res = impl.defaultMethod();
+        if (res != B.NEW_RETURN)
+            throw new Error("defaultMethod returned " + res +
+                            " expected " + B.NEW_RETURN);
+
+        System.gc();
+
+        RedefineClassHelper.redefineClass(B.class, redefinedDefaultMethod);
+
+        res = impl.defaultMethod();
+        if (res != RET)
+            throw new Error("defaultMethod returned " + res +
+                            " expected " + RET);
+    }
+}