--- /dev/null 2016-03-29 09:06:22.243762170 +0200 +++ new/test/java/nio/Buffer/DirectBufferAllocOOMETest.java 2016-04-01 16:47:29.273838593 +0200 @@ -0,0 +1,70 @@ +/* + * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ + +import java.lang.ref.Reference; +import java.nio.ByteBuffer; +import java.util.ArrayList; +import java.util.List; + +/** + * @test + * @bug 8149925 + * @summary Test that DirectByteBuffer allocation throws OOME and doesn't block + * indefinitely when MaxDirectMemorySize is exhausted + * + * @run main/othervm -XX:MaxDirectMemorySize=128m DirectBufferAllocOOMETest + */ +public class DirectBufferAllocOOMETest { + static final int CAPACITY = 1024 * 1024; // bytes + static volatile boolean wahr = true; + + static void allocUntilOOME() throws OutOfMemoryError { + List dbbs = new ArrayList<>(); + while (wahr) { + dbbs.add(ByteBuffer.allocateDirect(CAPACITY)); + } + Reference.reachabilityFence(dbbs); + } + + public static void main(String[] args) { + try { + allocUntilOOME(); + throw new IllegalStateException("Unexpected code path"); + } catch (OutOfMemoryError x) { + // expected + } + + // should succeed now + ByteBuffer.allocateDirect(CAPACITY); + + try { + allocUntilOOME(); + throw new IllegalStateException("Unexpected code path"); + } catch (OutOfMemoryError x) { + // expected + } + + // should succeed now + ByteBuffer.allocateDirect(CAPACITY); + } +}