1 /*

     2  * Copyright (c) 2014, 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  * @test

    26  * @bug 8043508

    27  * @summary Drawing a very long string crashes VM

    28  */

    29 

    30 import java.awt.*;

    31 import java.awt.image.*;

    32 

    33 public class DrawStringCrash {

    34 

    35     public static void main(String[] args) {

    36         StringBuffer sb = new StringBuffer();

    37         String s = "abcdefghijklmnopqrstuzwxyz";

    38         for (int x = 0; x < 100000 ; x++) {

    39            sb.append(s);

    40         }

    41         // Now have a string which uses approx 5Mb memory

    42         // Loop again drawing doubling each time until

    43         // we reach 8 billion chars or get OOME which means we can't

    44         // go any further.

    45         // Often there is no crash because Java OOM happens

    46         // long before native heap runs out.

    47         long maxLen = 8L * 1024 * 1024 * 1024;

    48         int len = sb.length();

    49 

    50         BufferedImage bi =

    51             new BufferedImage(100, 100, BufferedImage.TYPE_INT_RGB);

    52         Graphics2D g2d = bi.createGraphics();

    53         while (len < maxLen) {

    54             try {

    55                 g2d.drawString(s, 20, 20);

    56             } catch (OutOfMemoryError e) {

    57                 return;

    58             }

    59             sb.append(sb);

    60             len *= 2;

    61         }

    62         return;

    63     }

    64 }