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 }