1 /*
   2  * Copyright (c) 2015, 2017, 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 
  25 import java.lang.*;
  26 import java.lang.reflect.*;
  27 import jdk.internal.misc.JavaLangAccess;
  28 import jdk.internal.misc.SharedSecrets;
  29 
  30 class EmptyClassHelper {
  31     static final JavaLangAccess jla = SharedSecrets.getJavaLangAccess();
  32     static final String USE_APP = "useAppLoader";
  33     public static void main(String[] args) throws Exception {
  34         Class cls = null;
  35         Method m = null;
  36         ClassLoader appLoader = ClassLoader.getSystemClassLoader();
  37         String className = "com.sun.tools.javac.Main";
  38         if (args[0].equals(USE_APP)) {
  39             cls = appLoader.loadClass(className);
  40             System.out.println("appLoader loaded class");
  41             try {
  42                 m = cls.getMethod("main", String[].class);
  43                 System.out.println("appLoader found method main");
  44             } catch(NoSuchMethodException ex) {
  45                 System.out.println(ex.toString());
  46             }
  47         } else {
  48             cls = jla.findBootstrapClassOrNull(appLoader, className);
  49             System.out.println("bootLoader loaded class");
  50             System.out.println("cls = " + cls);
  51             try {
  52                 m = cls.getMethod("main", String[].class);
  53                 System.out.println("bootLoader found method main");
  54             } catch(NoSuchMethodException ex) {
  55                 System.out.println(ex.toString());
  56             }
  57         }
  58     }
  59 }