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  * @key headful
  33  * @bug 8072775
  34  * @run main/othervm -Xmx80m TextViewOOM
  35  */
  36 public 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 }