1 /*
   2  * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 package p;
  25 
  26 import java.io.*;
  27 import java.lang.instrument.ClassFileTransformer;
  28 import java.lang.instrument.Instrumentation;
  29 import java.security.ProtectionDomain;
  30 
  31 public class BootstrapClassPathAgent {
  32 
  33     public static void premain(String args, Instrumentation inst) {
  34         System.out.println("agent loader=" + BootstrapClassPathAgent.class.getClassLoader());
  35         inst.addTransformer(new MyTransformer());
  36     }
  37 
  38     static class MyTransformer implements ClassFileTransformer {
  39 
  40         public byte[] transform(Module module,
  41                                 String className,
  42                                 Class<?> classBeingRedefined,
  43                                 ProtectionDomain    protectionDomain,
  44                                 byte[] classfileBuffer) {
  45             System.out.println(className + ", module=" + module);
  46             return null;
  47         }
  48     }
  49 }