1 /* 2 * Copyright (c) 1997, 1998, 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 4076283 26 * @summary java.lang.ref.SoftReference should reliably prevent 27 * OutOfMemoryErrors 28 * @author Peter Jones 29 * @author Mark Reinhold 30 */ 31 32 /* If this test fails, an OutOfMemoryError will be thrown */ 33 34 import java.lang.ref.SoftReference; 35 36 37 public class Bash { 38 39 static class TestReference extends SoftReference { 40 41 public static TestReference head; 42 public TestReference next; 43 TestReference(Object referent)44 public TestReference(Object referent) { 45 super(referent); 46 next = head; 47 head = this; 48 } 49 } 50 51 52 static final int NUM_BLOCKS = 2048; 53 static final int BLOCK_SIZE = 32768; 54 55 main(String[] args)56 public static void main(String[] args) throws Exception { 57 58 for (int i = 0; i < NUM_BLOCKS; ++ i) { 59 TestReference ref = new TestReference(new byte[BLOCK_SIZE]); 60 } 61 62 int emptyCount = 0; 63 int fullCount = 0; 64 for (TestReference r = TestReference.head; r != null; r = r.next) { 65 if (r.get() == null) emptyCount++; 66 else fullCount++; 67 } 68 69 System.err.println(fullCount + " full, " + emptyCount + " empty "); 70 71 } 72 73 } 74