AllocateInstance.java revision 11833:1cbffa2beba6 
1/*
2 * Copyright (c) 2015, 2016, 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 /test/lib
28 * @modules java.base/jdk.internal.misc
29 *          java.management
30 * @run main AllocateInstance
31 */
32
33import jdk.test.lib.Utils;
34import jdk.internal.misc.Unsafe;
35import static jdk.test.lib.Asserts.*;
36
37public class AllocateInstance {
38    static final Unsafe UNSAFE = Utils.getUnsafe();
39
40    class TestClass {
41        public boolean calledConstructor = false;
42
43        public TestClass() {
44            calledConstructor = true;
45        }
46    }
47
48    static void testConstructorCall() throws InstantiationException {
49        // allocateInstance() should not result in a call to the constructor
50        TestClass tc = (TestClass)UNSAFE.allocateInstance(TestClass.class);
51        assertFalse(tc.calledConstructor);
52    }
53
54    abstract class AbstractClass {
55        public AbstractClass() {}
56    }
57
58    static void testAbstractClass() {
59        try {
60            AbstractClass ac = (AbstractClass) UNSAFE.allocateInstance(AbstractClass.class);
61            throw new AssertionError("Should throw InstantiationException for an abstract class");
62        } catch (InstantiationException e) {
63            // Expected
64        }
65    }
66
67    interface AnInterface {}
68
69    static void testInterface() {
70        try {
71            AnInterface ai = (AnInterface) UNSAFE.allocateInstance(AnInterface.class);
72            throw new AssertionError("Should throw InstantiationException for an interface");
73        } catch (InstantiationException e) {
74            // Expected
75        }
76    }
77
78    public static void main(String args[]) throws Exception {
79        for (int i = 0; i < 20_000; i++) {
80            testConstructorCall();
81            testAbstractClass();
82            testInterface();
83        }
84    }
85}
86