1 /*
   2  * Copyright (c) 2013, 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 /**
  25  * @bug 8015334
  26  * @summary Memory leak with kerning.
  27  */
  28 
  29 import java.awt.EventQueue;
  30 import java.awt.Font;
  31 import java.awt.FontMetrics;
  32 import java.awt.font.TextAttribute;
  33 import java.util.HashMap;
  34 import java.util.Map;
  35 import javax.swing.JLabel;
  36 import javax.swing.SwingUtilities;
  37 
  38 public class KerningLeak {
  39 
  40     public static void main(String[] args) {
  41         EventQueue.invokeLater(new Runnable() {
  42             @Override
  43             public void run() {
  44                 leak();
  45             }
  46         });
  47     }
  48     
  49     private static void leak() {
  50         Map<TextAttribute, Object> textAttributes = new HashMap<>();
  51         textAttributes.put(TextAttribute.FAMILY, "Sans Serif");
  52         textAttributes.put(TextAttribute.SIZE, 12);
  53         textAttributes.put(TextAttribute.KERNING, TextAttribute.KERNING_ON);
  54         Font font = Font.getFont(textAttributes);
  55         JLabel label = new JLabel();
  56         int dummy = 0;
  57         for (int i = 0; i < 500; i++) {
  58             if (i % 10 == 0) System.out.println("Starting iter " + (i+1));
  59             for (int j = 0; j <1000; j++) {
  60                 FontMetrics fm = label.getFontMetrics(font);
  61                 dummy += SwingUtilities.computeStringWidth(fm, Integer.toString(j));
  62             }
  63         }
  64         System.out.println("done " + dummy);
  65     }
  66 }