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 package test.java.lang.ref; 29 30 import java.lang.ref.*; 31 32 import org.testng.annotations.Test; 33 import org.testng.Assert; 34 35 public class EnqueueNullRefTest { 36 test(ReferenceQueue q, Reference r)37 static void test(ReferenceQueue q, Reference r) { 38 if (!r.enqueue()) 39 throw new RuntimeException("Enqueue operation failed"); 40 } 41 42 @Test test()43 public void test() { 44 ReferenceQueue q = new ReferenceQueue(); 45 test(q, new WeakReference(null, q)); 46 test(q, new SoftReference(null, q)); 47 test(q, new PhantomReference(null, q)); 48 } 49 50 } 51