1/*
2 * Copyright (c) 2003, 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/* @test
25 * @bug 4247236
26 * @summary Ensure that reference objects with null referents can be enqueued
27 */
28
29import java.lang.ref.*;
30
31
32public class EnqueueNullRef {
33
34    static void test(ReferenceQueue q, Reference r) {
35        if (!r.enqueue())
36            throw new RuntimeException("Enqueue operation failed");
37    }
38
39    public static void main(String[] args) {
40        ReferenceQueue q = new ReferenceQueue();
41        test(q, new WeakReference(null, q));
42        test(q, new SoftReference(null, q));
43        test(q, new PhantomReference(null, q));
44    }
45
46}
47