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/*
* 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();
}
}
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