1 /*

     2  * Copyright (c) 2015, 2018, 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 

    27 import java.lang.reflect.Method;

    28 import jdk.internal.access.JavaLangAccess;

    29 import jdk.internal.access.SharedSecrets;

    30 

    31 class EmptyClassHelper {

    32     static final JavaLangAccess jla = SharedSecrets.getJavaLangAccess();

    33     static final String USE_APP = "useAppLoader";

    34     public static void main(String[] args) throws Exception {

    35         Class cls = null;

    36         Method m = null;

    37         ClassLoader appLoader = ClassLoader.getSystemClassLoader();

    38         String className = "com.sun.tools.javac.Main";

    39         if (args[0].equals(USE_APP)) {

    40             cls = appLoader.loadClass(className);

    41             System.out.println("appLoader loaded class");

    42             try {

    43                 m = cls.getMethod("main", String[].class);

    44                 System.out.println("appLoader found method main");

    45             } catch(NoSuchMethodException ex) {

    46                 System.out.println(ex.toString());

    47             }

    48         } else {

    49             cls = jla.findBootstrapClassOrNull(appLoader, className);

    50             System.out.println("bootLoader loaded class");

    51             System.out.println("cls = " + cls);

    52             try {

    53                 m = cls.getMethod("main", String[].class);

    54                 System.out.println("bootLoader found method main");

    55             } catch(NoSuchMethodException ex) {

    56                 System.out.println(ex.toString());

    57             }

    58         }

    59     }

    60 }