| /* |
| * Copyright (c) 2018, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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. |
| */ |
| /* |
| * @test |
| * @bug 8196869 |
| * @summary Make sure we deal with internal Key data being cleared properly |
| * @run main/othervm -Xms16m -Xmx16m -esa SoftKeys |
| * @ignore This test aims to provoke NPEs, but due to the need to constrain |
| * memory usage it fails intermittently with OOME on various systems |
| * with no way to ignore such failures. |
| */ |
| import java.util.*; |
| |
| public class SoftKeys { |
| |
| private static final char[] CHARS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; |
| |
| public static void main(String[] args) { |
| try { |
| // With 4 characters in "language", we'll fill up a 16M heap quickly, |
| // causing full GCs and SoftReference reclamation. Repeat at least two |
| // times to verify no NPEs appear when looking up Locale's whose |
| // softly referenced data in sun.util.locale.BaseLocale$Key might have |
| // been cleared. |
| for (int i = 0; i < 2; i++) { |
| for (int j = 0; j < 512*1024; j++) { |
| new Locale(langForInt(j), "", ""); |
| } |
| } |
| } catch (OutOfMemoryError e) { |
| // Can happen on some system configurations, and while increasing heap |
| // size would allow GC to keep up, it also makes it impractically hard |
| // to reproduce NPE issues that could arise when references are being |
| // cleared. |
| |
| // Do a System.gc() to not throw an OOME again in the jtreg wrapper. |
| System.gc(); |
| } |
| } |
| |
| private static String langForInt(int val) { |
| StringBuilder buf = new StringBuilder(4); |
| buf.append(CHARS[(val >> 12) & 0xF]); |
| buf.append(CHARS[(val >> 8) & 0xF]); |
| buf.append(CHARS[(val >> 4) & 0xF]); |
| buf.append(CHARS[(val >> 0) & 0xF]); |
| return buf.toString(); |
| } |
| } |
| |