1 /*

     2  * Copyright (c) 2018, 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 8191416

    26  * @summary Verify no UnsupportedOperationException for cast subclass

    27  */

    28 

    29 import java.nio.ByteBuffer;

    30 import java.nio.MappedByteBuffer;

    31 

    32 public class SubclassCastUOE {

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

    34         ByteBuffer buf = ByteBuffer.allocateDirect(37);

    35 

    36         if (!(buf instanceof MappedByteBuffer)) {

    37             throw new RuntimeException("Direct buffer not a MappedByteBuffer");

    38         }

    39 

    40         if (((MappedByteBuffer)buf).load() != buf) {

    41             throw new RuntimeException("load() did not return same buffer");

    42         }

    43 

    44         if (!((MappedByteBuffer)buf).isLoaded()) {

    45             throw new RuntimeException("isLoaded() returned false");

    46         }

    47 

    48         if (((MappedByteBuffer)buf).force() != buf) {

    49             throw new RuntimeException("force() did not return same buffer");

    50         }

    51     }

    52 }