--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/runtime/RedefineTests/RedefineLeak.java	Tue Oct 18 08:39:43 2016 -0400
@@ -0,0 +1,112 @@
+/*
+ * 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
+ * @library /test/lib
+ * @summary Test that redefinition reuses metaspace blocks that are freed
+ * @modules java.base/jdk.internal.misc
+ * @modules java.instrument
+ *          jdk.jartool/sun.tools.jar
+ * @run main RedefineLeak buildagent
+ * @run main/othervm/timeout=6000  RedefineLeak runtest
+ */
+
+import java.io.FileNotFoundException;
+import java.io.PrintWriter;
+import java.lang.RuntimeException;
+import java.lang.instrument.ClassFileTransformer;
+import java.lang.instrument.Instrumentation;
+import java.security.ProtectionDomain;
+import java.lang.instrument.IllegalClassFormatException;
+import jdk.test.lib.process.ProcessTools;
+import jdk.test.lib.process.OutputAnalyzer;
+
+public class RedefineLeak {
+    static class Tester {}
+
+    static class LoggingTransformer implements ClassFileTransformer {
+        static int transformCount = 0;
+
+        public LoggingTransformer() {}
+
+        public byte[] transform(ClassLoader loader, String className, Class classBeingRedefined,
+            ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {
+
+            transformCount++;
+            if (transformCount % 1000 == 0) System.out.println("transformCount:" + transformCount);
+            return null;
+        }
+    }
+
+    public static void premain(String agentArgs, Instrumentation inst) throws Exception {
+        LoggingTransformer t = new LoggingTransformer();
+        inst.addTransformer(t, true);
+        {
+            Class demoClass = Class.forName("RedefineLeak$Tester");
+
+            for (int i = 0; i < 10000; i++) {
+               inst.retransformClasses(demoClass);
+            }
+        }
+        System.gc();
+    }
+    private static void buildAgent() {
+        try {
+            ClassFileInstaller.main("RedefineLeak");
+        } catch (Exception e) {
+            throw new RuntimeException("Could not write agent classfile", e);
+        }
+
+        try {
+            PrintWriter pw = new PrintWriter("MANIFEST.MF");
+            pw.println("Premain-Class: RedefineLeak");
+            pw.println("Agent-Class: RedefineLeak");
+            pw.println("Can-Redefine-Classes: true");
+            pw.println("Can-Retransform-Classes: true");
+            pw.close();
+        } catch (FileNotFoundException e) {
+            throw new RuntimeException("Could not write manifest file for the agent", e);
+        }
+
+        sun.tools.jar.Main jarTool = new sun.tools.jar.Main(System.out, System.err, "jar");
+        if (!jarTool.run(new String[] { "-cmf", "MANIFEST.MF", "redefineagent.jar", "RedefineLeak.class" })) {
+            throw new RuntimeException("Could not write the agent jar file");
+        }
+    }
+    public static void main(String argv[]) throws Exception {
+        if (argv.length == 1 && argv[0].equals("buildagent")) {
+            buildAgent();
+            return;
+        }
+        if (argv.length == 1 && argv[0].equals("runtest")) {
+            // run outside of jtreg to not OOM on jtreg classes that are loaded after metaspace is full
+            String[] javaArgs1 = { "-XX:MetaspaceSize=12m", "-XX:MaxMetaspaceSize=12m",
+                                   "-javaagent:redefineagent.jar", "RedefineLeak"};
+            ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(javaArgs1);
+
+            OutputAnalyzer output = new OutputAnalyzer(pb.start());
+            output.shouldContain("transformCount:10000");
+        }
+    }
+}