1 /*
   2  * Copyright (c) 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 import jdk.internal.misc.Unsafe;
  25 
  26 public class ClassLoaderNoUnnamedModule {
  27     static final Unsafe UNSAFE = Unsafe.getUnsafe();
  28 
  29     class TestClass extends ClassLoader {
  30         public boolean calledConstructor = false;
  31 
  32         public TestClass() {
  33             calledConstructor = true;
  34         }
  35     }
  36 
  37     static void testConstructorCall() throws Exception {
  38         // Use Unsafe allocateInstance to construct an instance of TestClass
  39         // which does not invoke its super's, java.lang.ClassLoader, constructor.
  40         // An unnamed module for this ClassLoader is not created.
  41         TestClass tc = (TestClass)UNSAFE.allocateInstance(TestClass.class);
  42         System.out.println("tc = " + tc + "tc's ctor called = " + tc.calledConstructor);
  43         Module unnamed_module = tc.getUnnamedModule();
  44         if (unnamed_module == null) {
  45             System.out.println("The unnamed module for this class loader is null");
  46         }
  47 
  48         tc.loadClass(String.class.getName());
  49         Class.forName(String.class.getName(), false, tc);
  50     }
  51 
  52     public static void main(String args[]) throws Exception {
  53         testConstructorCall();
  54     }
  55 }