1 /*

     2  * Copyright (c) 2018, 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.  Oracle designates this

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

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 /*

    26  * @test

    27  * @bug 8196869

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

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

    30  */

    31 import java.util.*;

    32 

    33 public class SoftKeys {

    34 

    35     private static final char[] CHARS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };

    36 

    37     public static void main(String[] args) {

    38         // With 4 characters in "language", we'll fill up a 16M heap quickly,

    39         // causing full GCs and SoftReference reclamation. Repeat at least two

    40         // times to verify no NPEs appear when looking up Locale's whose

    41         // softly referenced data in sun.util.locale.BaseLocale$Key might have

    42         // been cleared.

    43         for (int i = 0; i < 2; i++) {

    44             for (int j = 0; j < 512*1024; j++) {

    45                 new Locale(langForInt(j), "", "");

    46             }

    47         }

    48     }

    49 

    50     private static String langForInt(int val) {

    51         StringBuilder buf = new StringBuilder(4);

    52         buf.append(CHARS[(val >> 12) & 0xF]);

    53         buf.append(CHARS[(val >>  8) & 0xF]);

    54         buf.append(CHARS[(val >>  4) & 0xF]);

    55         buf.append(CHARS[(val >>  0) & 0xF]);

    56         return buf.toString();

    57     }

    58 }

    59