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(sb.toString(), 20, 20);


  56             } catch (OutOfMemoryError e) {
  57                 return;
  58             }
  59             sb.append(sb);
  60             len *= 2;
  61         }
  62         return;
  63     }
  64 }

   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 8080084
  27  * @summary Drawing a very long string crashes VM
  28  * @run main/othervm DrawStringCrash
  29  */
  30 
  31 import java.awt.*;
  32 import java.awt.image.*;
  33 
  34 public class DrawStringCrash {
  35 
  36     public static void main(String[] args) {
  37         StringBuffer sb = new StringBuffer();
  38         String s = "abcdefghijklmnopqrstuzwxyz";
  39         for (int x = 0; x < 100000 ; x++) {
  40            sb.append(s);
  41         }
  42         // Now have a string which uses approx 5Mb memory
  43         // Loop again drawing doubling each time until
  44         // we reach 8 billion chars or get OOME which means we can't
  45         // go any further.
  46         // Often there is no crash because Java OOM happens
  47         // long before native heap runs out.
  48         long maxLen = 8L * 1024 * 1024 * 1024;
  49         int len = sb.length();
  50 
  51         BufferedImage bi =
  52             new BufferedImage(100, 100, BufferedImage.TYPE_INT_RGB);
  53         Graphics2D g2d = bi.createGraphics();
  54         while (len < maxLen) {
  55             try {
  56                 g2d.drawString(sb.toString(), 20, 20);
  57                 sb.append(sb);
  58                 len *= 2;
  59             } catch (OutOfMemoryError e) {
  60                 return;
  61             }


  62         }
  63         return;
  64     }
  65 }