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 }