--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/runtime/RedefineObject/Agent.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2013, 2014, 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.
+ */
+import java.security.*;
+import java.lang.instrument.*;
+import java.lang.reflect.*;
+
+public class Agent implements ClassFileTransformer {
+    public synchronized byte[] transform(final ClassLoader classLoader,
+                                         final String className,
+                                         Class<?> classBeingRedefined,
+                                         ProtectionDomain protectionDomain,
+                                         byte[] classfileBuffer) {
+        System.out.println("Transforming class " + className);
+        return classfileBuffer;
+    }
+
+    public static void redefine(String agentArgs, Instrumentation instrumentation, Class to_redefine) {
+
+        try {
+            instrumentation.retransformClasses(to_redefine);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+
+    }
+
+    public static void premain(String agentArgs, Instrumentation instrumentation) {
+        Agent transformer = new Agent();
+        instrumentation.addTransformer(transformer, true);
+
+        // Redefine java/lang/Object and java/lang/reflect/Method.invoke and
+        // java/lang/ClassLoader
+        Class object_class = Object.class;
+        redefine(agentArgs, instrumentation, object_class);
+
+        Class method_class = Method.class;
+        redefine(agentArgs, instrumentation, method_class);
+
+        Class loader_class = ClassLoader.class;
+        redefine(agentArgs, instrumentation, loader_class);
+
+        instrumentation.removeTransformer(transformer);
+    }
+
+    public static void main(String[] args) {
+        byte[] ba = new byte[0];
+
+        // If it survives 100 GC's, it's good.
+        for (int i = 0; i < 100 ; i++) {
+            System.gc();
+            ba.clone();
+        }
+        try {
+            // Use java/lang/reflect/Method.invoke to call
+            WalkThroughInvoke a = new WalkThroughInvoke();
+            Class aclass = WalkThroughInvoke.class;
+            Method m = aclass.getMethod("stackWalk");
+            m.invoke(a);
+        } catch (Exception x) {
+            x.printStackTrace();
+        }
+    }
+}