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10268
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1 /*
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2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 import java.security.*;
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24 import java.lang.instrument.*;
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25
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26 public class Agent implements ClassFileTransformer {
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27 public synchronized byte[] transform(final ClassLoader classLoader,
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28 final String className,
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29 Class<?> classBeingRedefined,
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30 ProtectionDomain protectionDomain,
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31 byte[] classfileBuffer) {
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32 //System.out.println("Transforming class " + className);
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33 return classfileBuffer;
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34 }
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35
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36 public static void premain(String agentArgs, Instrumentation instrumentation) {
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37
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38 Agent transformer = new Agent();
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39
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40 instrumentation.addTransformer(transformer, true);
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41
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42 Class c = Object.class;
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43 try {
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44 instrumentation.retransformClasses(c);
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45 } catch (Exception e) {
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46 e.printStackTrace();
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47 }
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48
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49 instrumentation.removeTransformer(transformer);
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50 }
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51
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52 public static void main(String[] args) {
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53 byte[] ba = new byte[0];
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54
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55 // If it survives 1000 GC's, it's good.
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56 for (int i = 0; i < 1000 ; i++) {
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57 System.gc();
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58 ba.clone();
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59 }
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60 }
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61 }
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