1 /*
   2  * Copyright (c) 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  * @test
  26  * @bug 8187222
  27  * @run main/othervm -Djava.system.class.loader=RecursiveSystemLoader RecursiveSystemLoader
  28  * @summary Test for IllegalStateException if a custom system loader recursively calls getSystemClassLoader()
  29  */
  30 public class RecursiveSystemLoader extends ClassLoader {
  31     public static void main(String[] args) {
  32         ClassLoader sys = ClassLoader.getSystemClassLoader();
  33         if (!(sys instanceof RecursiveSystemLoader)) {
  34             throw new RuntimeException("Unexpected system classloader: " + sys);
  35         }
  36     }
  37     public RecursiveSystemLoader(ClassLoader classLoader) {
  38         super("RecursiveSystemLoader", classLoader);
  39 
  40         // Calling ClassLoader.getSystemClassLoader() before the VM is booted
  41         // should throw an IllegalStateException.
  42         try {
  43             ClassLoader.getSystemClassLoader();
  44         } catch(IllegalStateException ise) {
  45             System.err.println("Caught expected exception:");
  46             ise.printStackTrace();
  47             return;
  48         }
  49         throw new RuntimeException("Expected IllegalStateException was not thrown.");
  50     }
  51 
  52     @Override
  53     public Class<?> loadClass(String name) throws ClassNotFoundException {
  54         return super.loadClass(name);
  55     }    
  56 }