1 /*
   2  * Copyright (c) 2015, 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  * @summary Verifies the behaviour of Unsafe.allocateInstance
  27  * @library /testlibrary
  28  * @modules java.base/sun.misc
  29  *          java.management
  30  * @run main AllocateInstance
  31  */
  32 
  33 import jdk.test.lib.*;
  34 import sun.misc.Unsafe;
  35 import static jdk.test.lib.Asserts.*;
  36 
  37 public class AllocateInstance {
  38     public static void main(String args[]) throws Exception {
  39         Unsafe unsafe = Utils.getUnsafe();
  40 
  41         // allocateInstance() should not result in a call to the constructor
  42         TestClass tc = (TestClass)unsafe.allocateInstance(TestClass.class);
  43         assertFalse(tc.calledConstructor);
  44 
  45         // allocateInstance() on an abstract class should result in an InstantiationException
  46         try {
  47             AbstractClass ac = (AbstractClass)unsafe.allocateInstance(AbstractClass.class);
  48             throw new RuntimeException("Did not get expected InstantiationException");
  49         } catch (InstantiationException e) {
  50             // Expected
  51         }
  52     }
  53 
  54     class TestClass {
  55         public boolean calledConstructor = false;
  56 
  57         public TestClass() {
  58             calledConstructor = true;
  59         }
  60     }
  61 
  62     abstract class AbstractClass {
  63         public AbstractClass() {}
  64     }
  65 }