1 /*
   2  * Copyright (c) 2016, 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 import java.lang.ref.Reference;
  25 import java.nio.ByteBuffer;
  26 import java.util.ArrayList;
  27 import java.util.List;
  28 
  29 /**
  30  * @test
  31  * @bug 8149925
  32  * @summary Test that DirectByteBuffer allocation throws OOME and doesn't block
  33  *          indefinitely when MaxDirectMemorySize is exhausted
  34  *
  35  * @run main/othervm -XX:MaxDirectMemorySize=128m DirectBufferAllocOOMETest
  36  */
  37 public class DirectBufferAllocOOMETest {
  38     static final int CAPACITY = 1024 * 1024; // bytes
  39     static volatile boolean wahr = true;
  40 
  41     static void allocUntilOOME() throws OutOfMemoryError {
  42         List<ByteBuffer> dbbs = new ArrayList<>();
  43         while (wahr) {
  44             dbbs.add(ByteBuffer.allocateDirect(CAPACITY));
  45         }
  46         Reference.reachabilityFence(dbbs);
  47     }
  48 
  49     public static void main(String[] args) {
  50         try {
  51             allocUntilOOME();
  52             throw new IllegalStateException("Unexpected code path");
  53         } catch (OutOfMemoryError x) {
  54             // expected
  55         }
  56 
  57         // should succeed now
  58         ByteBuffer.allocateDirect(CAPACITY);
  59 
  60         try {
  61             allocUntilOOME();
  62             throw new IllegalStateException("Unexpected code path");
  63         } catch (OutOfMemoryError x) {
  64             // expected
  65         }
  66 
  67         // should succeed now
  68         ByteBuffer.allocateDirect(CAPACITY);
  69     }
  70 }