1 /*
 2  * Copyright (c) 2019, 2025, 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 java.lang.ref.WeakReference;
25 import java.lang.ref.ReferenceQueue;
26 
27 import org.testng.annotations.Test;
28 import static org.testng.Assert.*;
29 
30 /*
31  * @test
32  * @summary Test value classes with Reference types
33  * @enablePreview
34  * @run testng/othervm WeakReferenceTest
35  */
36 @Test
37 public class WeakReferenceTest {
38     static value class Value {
39     }
40 
41     @Test(expectedExceptions = IdentityException.class)
42     static void test1() {
43         Value v = new Value();
44         WeakReference<Value> r = new WeakReference<>(v);
45     }
46 
47     @Test(expectedExceptions = IdentityException.class)
48     static void test2() {
49         ReferenceQueue<Object> q = new ReferenceQueue<>();
50         Value v = new Value();
51         WeakReference<Value> r = new WeakReference<>(v, q);
52     }
53 }