70 lines
2.8 KiB
Java
70 lines
2.8 KiB
Java
/*
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* Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8196869
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* @summary Make sure we deal with internal Key data being cleared properly
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* @run main/othervm -Xms16m -Xmx16m -esa SoftKeys
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*/
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import java.util.*;
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public class SoftKeys {
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private static final char[] CHARS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
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public static void main(String[] args) {
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try {
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// With 4 characters in "language", we'll fill up a 16M heap quickly,
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// causing full GCs and SoftReference reclamation. Repeat at least two
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// times to verify no NPEs appear when looking up Locale's whose
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// softly referenced data in sun.util.locale.BaseLocale$Key might have
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// been cleared.
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for (int i = 0; i < 2; i++) {
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for (int j = 0; j < 512*1024; j++) {
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new Locale(langForInt(j), "", "");
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}
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}
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} catch (OutOfMemoryError e) {
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// Can happen on some system configurations, and while increasing heap
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// size would allow GC to keep up, it also makes it impractically hard
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// to reproduce NPE issues that could arise when references are being
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// cleared.
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// Do a System.gc() to not throw an OOME again in the jtreg wrapper.
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System.gc();
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}
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}
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private static String langForInt(int val) {
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StringBuilder buf = new StringBuilder(4);
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buf.append(CHARS[(val >> 12) & 0xF]);
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buf.append(CHARS[(val >> 8) & 0xF]);
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buf.append(CHARS[(val >> 4) & 0xF]);
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buf.append(CHARS[(val >> 0) & 0xF]);
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return buf.toString();
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}
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}
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