1 /*

     2  * Copyright (c) 2001, 2010, 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 /* @test

    25  * @bug 4463036

    26  * @summary Check if file mapping extends beyond end of file

    27  * @run main/othervm MapOverEnd

    28  */

    29 

    30 import java.nio.*;

    31 import java.nio.channels.*;

    32 import java.io.*;

    33 

    34 public class MapOverEnd {

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

    36         File blah = File.createTempFile("blah", null);

    37         blah.deleteOnExit();

    38         RandomAccessFile raf = new RandomAccessFile (blah, "rw");

    39         FileChannel fc = raf.getChannel();

    40         MappedByteBuffer map = fc.map(FileChannel.MapMode.READ_WRITE, 0, 2048);

    41         fc.close();

    42         double current = map.getDouble (50);

    43         map.putDouble (50, current+0.1d);

    44         map.force();

    45     }

    46 }