1/*
2 * Copyright (c) 2015, 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
24import java.awt.EventQueue;
25
26import javax.swing.JFrame;
27import javax.swing.JScrollPane;
28import javax.swing.JTextArea;
29
30/**
31 * @test
32 * @key headful
33 * @bug 8072775
34 * @run main/othervm -Xmx80m TextViewOOM
35 */
36public class TextViewOOM {
37
38    private static JFrame frame;
39    private static JTextArea ta;
40    private static final String STRING = "\uDC00\uD802\uDFFF";
41    private static final int N = 5000;
42
43    private static void createAndShowGUI() {
44        frame = new JFrame();
45        final JScrollPane jScrollPane1 = new JScrollPane();
46        ta = new JTextArea();
47
48        ta.setEditable(false);
49        ta.setColumns(20);
50        ta.setRows(5);
51        jScrollPane1.setViewportView(ta);
52        frame.add(ta);
53
54        frame.pack();
55        frame.setLocationRelativeTo(null);
56        frame.setVisible(true);
57    }
58
59    public static void main(final String[] args) throws Exception {
60        /* Create and display the form */
61        EventQueue.invokeAndWait(TextViewOOM::createAndShowGUI);
62        for (int i = 0; i < 10; i++) {
63            System.gc();
64            Thread.sleep(1000);
65        }
66        long mem = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
67        System.err.println("Memory before creating the text: "+mem);
68        final StringBuilder sb = new StringBuilder(N * STRING.length());
69        for (int i = 0; i < N; i++) {
70            sb.append(STRING);
71        }
72        for (int i = 0; i < 10; i++) {
73            System.gc();
74            Thread.sleep(1000);
75        }
76        mem = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
77        System.err.println("Memory after  creating the text: "+mem);
78
79        EventQueue.invokeAndWait(() -> {
80            ta.setText(sb.toString());
81            for (int i = 0; i < 10; i++) {
82                System.gc();
83                try {Thread.sleep(200);} catch (InterruptedException iex) {}
84            }
85            long mem1 = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
86            System.err.println("Memory after  setting the text: " + mem1);
87        });
88        for (int i = 0; i < 10; i++) {
89            System.gc();
90            Thread.sleep(1000);
91        }
92        mem = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
93        System.err.println("Final memory  after everything: " + mem);
94        EventQueue.invokeAndWait(frame::dispose);
95    }
96}
97