--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/lang/instrument/RedefineBigClassAgent.java	Thu Dec 22 18:35:48 2011 -0800
@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2011, 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.lang.instrument.*;
+import java.net.*;
+import java.util.*;
+import java.io.*;
+
+public class RedefineBigClassAgent {
+    // N_REDEFINES = 2000 made my Solaris X86 box crawl on its knees
+    // with the Server VM. The timeout is 600 seconds, but the test
+    // ran for 675 seconds so it took the harness 75 seconds to kill
+    // the test.
+    private static int N_REDEFINES = 1000;
+    public static Class clz;
+    public static volatile boolean doneRedefining = false;
+
+    // just read the original class and redefine in a loop via a Timer
+    public static void premain(String agentArgs, final Instrumentation inst) throws Exception {
+        String s = agentArgs.substring(0, agentArgs.indexOf(".class"));
+        clz = Class.forName(s.replace('/', '.'));
+        ClassLoader loader =
+            RedefineBigClassAgent.class.getClassLoader();
+        URL classURL = loader.getResource(agentArgs);
+        if (classURL == null) {
+            throw new Exception("Cannot find class: " + agentArgs);
+        }
+
+        int         redefineLength;
+        InputStream redefineStream;
+
+        System.out.println("Reading test class from " + classURL);
+        if (classURL.getProtocol().equals("file")) {
+            File f = new File(classURL.getFile());
+            redefineStream = new FileInputStream(f);
+            redefineLength = (int) f.length();
+        } else {
+            URLConnection conn = classURL.openConnection();
+            redefineStream = conn.getInputStream();
+            redefineLength = conn.getContentLength();
+        }
+
+        final byte[] buffer = new byte[redefineLength];
+        new BufferedInputStream(redefineStream).read(buffer);
+
+        System.gc();  // throw away anything we can before we start testing
+
+        new Timer(true).schedule(new TimerTask() {
+            public void run() {
+                try {
+                    int i;
+                    System.out.println("Redefining");
+                    ClassDefinition cld = new ClassDefinition(clz, buffer);
+                    for (i = 0; i < N_REDEFINES; i++) {
+                        inst.redefineClasses(new ClassDefinition[] { cld });
+                        System.gc();  // throw away anything we can
+                    }
+                    System.out.println("Redefined " + i + " times.");
+                    RedefineBigClassAgent.doneRedefining = true;
+                }
+                catch (Exception e) { e.printStackTrace(); }
+            }
+        }, 500);
+    }
+}