1 /*
2  * Copyright (c) 2014, 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
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17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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23 
24 /**
25  * @test
26  * @key headful
27  * @bug 8040076
28  * @summary AwtList not garbage collected
29  * @run main/othervm -Xmx100m AwtListGarbageCollectionTest
30  */
31 
32 import java.awt.*;
33 import java.awt.event.WindowAdapter;
34 import java.awt.event.WindowEvent;
35 import java.lang.ref.WeakReference;
36 
37 public class AwtListGarbageCollectionTest {
main(String[] args)38     public static void main(String[] args) {
39         Frame frame = new Frame("List leak test");
40         try {
41             test(frame);
42         } finally {
43             frame.dispose();
44         }
45     }
46 
test(Frame frame)47     private static void test(Frame frame) {
48         WeakReference<List> weakListRef = null;
49         try {
50             frame.setSize(300, 200);
51             frame.setVisible(true);
52 
53             List strongListRef = new List();
54             frame.add(strongListRef);
55             strongListRef.setMultipleMode(true);
56             frame.remove(strongListRef);
57             weakListRef = new WeakReference<List>(strongListRef);
58             strongListRef = null;
59 
60             //make out of memory to force gc
61             String veryLongString = new String(new char[100]);
62             while (true) {
63                 veryLongString += veryLongString;
64             }
65         } catch (OutOfMemoryError e) {
66             if (weakListRef == null) {
67                 throw new RuntimeException("Weak list ref wasn't created");
68             } else if (weakListRef.get() != null) {
69                 throw new RuntimeException("List wasn't garbage collected");
70             }
71         }
72     }
73 }
74