1 /*

     2  * Copyright (c) 2013, 2015, 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.

     8  *

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

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

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

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

    13  * accompanied this code).

    14  *

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

    16  * 2 along with this work; if not, write to the Free Software Foundation,

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

    18  *

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

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

    21  * questions.

    22  */

    23 

    24 import sun.hotspot.WhiteBox;

    25 

    26 // This class is used by the test SharedStrings.java

    27 // It should be launched in CDS mode

    28 public class SharedStringsWb {

    29     public static void main(String[] args) throws Exception {

    30         WhiteBox wb = WhiteBox.getWhiteBox();

    31 

    32         if (wb.areSharedStringsIgnored()) {

    33             System.out.println("Shared strings are ignored, assuming PASS");

    34             return;

    35         }

    36 

    37         // The string below is known to be added to CDS archive

    38         String s = "<init>";

    39         String internedS = s.intern();

    40 

    41         // Check that it's a valid string

    42         if (s.getClass() != String.class || !(s instanceof String)) {

    43             throw new RuntimeException("Shared string is not a valid String: FAIL");

    44         }

    45 

    46         if (wb.isShared(internedS)) {

    47             System.out.println("Found shared string, result: PASS");

    48         } else {

    49             throw new RuntimeException("String is not shared, result: FAIL");

    50         }

    51     }

    52 }

    53 

    54