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 

    24 import java.awt.EventQueue;

    25 

    26 import javax.swing.JFrame;

    27 import javax.swing.JScrollPane;

    28 import javax.swing.JTextArea;

    29 

    30 /**

    31  * @test

    32  * @bug 8072775

    33  * @run main/othervm -Xmx80m TextViewOOM

    34  */

    35 public class TextViewOOM {

    36 

    37     private static JFrame frame;

    38     private static JTextArea ta;

    39     private static final String STRING = "\uDC00\uD802\uDFFF";

    40     private static final int N = 5000;

    41 

    42     private static void createAndShowGUI() {

    43         frame = new JFrame();

    44         final JScrollPane jScrollPane1 = new JScrollPane();

    45         ta = new JTextArea();

    46 

    47         ta.setEditable(false);

    48         ta.setColumns(20);

    49         ta.setRows(5);

    50         jScrollPane1.setViewportView(ta);

    51         frame.add(ta);

    52 

    53         frame.pack();

    54         frame.setLocationRelativeTo(null);

    55         frame.setVisible(true);

    56     }

    57 

    58     public static void main(final String[] args) throws Exception {

    59         /* Create and display the form */

    60         EventQueue.invokeAndWait(TextViewOOM::createAndShowGUI);

    61         for (int i = 0; i < 10; i++) {

    62             System.gc();

    63             Thread.sleep(1000);

    64         }

    65         long mem = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();

    66         System.err.println("Memory before creating the text: "+mem);

    67         final StringBuilder sb = new StringBuilder(N * STRING.length());

    68         for (int i = 0; i < N; i++) {

    69             sb.append(STRING);

    70         }

    71         for (int i = 0; i < 10; i++) {

    72             System.gc();

    73             Thread.sleep(1000);

    74         }

    75         mem = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();

    76         System.err.println("Memory after  creating the text: "+mem);

    77 

    78         EventQueue.invokeAndWait(() -> {

    79             ta.setText(sb.toString());

    80             for (int i = 0; i < 10; i++) {

    81                 System.gc();

    82                 try {Thread.sleep(200);} catch (InterruptedException iex) {}

    83             }

    84             long mem1 = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();

    85             System.err.println("Memory after  setting the text: " + mem1);

    86         });

    87         for (int i = 0; i < 10; i++) {

    88             System.gc();

    89             Thread.sleep(1000);

    90         }

    91         mem = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();

    92         System.err.println("Final memory  after everything: " + mem);

    93         EventQueue.invokeAndWait(frame::dispose);

    94     }

    95 }