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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

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 *

 * 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

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 * accompanied this code).

 *

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/*

 * @test

 * @bug 8196869

 * @summary Make sure we deal with internal Key data being cleared properly

 * @run main/othervm -Xms16m -Xmx16m -esa SoftKeys

 */

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();

    }

}