1 /*

     2  * Copyright (c) 2017, 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 

    25 import java.io.File;

    26 import java.net.URL;

    27 import java.net.URLClassLoader;

    28 import sun.hotspot.WhiteBox;

    29 

    30 public class CheckCachedResolvedReferencesApp {

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

    32         String path = args[0];

    33         URL url = new File(path).toURI().toURL();

    34         URL[] urls = new URL[] {url};

    35 

    36         URLClassLoader loader = new URLClassLoader(urls);

    37         Class hello = loader.loadClass("Hello");

    38         System.out.println("Loaded " + hello + " from " + url + " using loader " + loader);

    39 

    40         WhiteBox wb = WhiteBox.getWhiteBox();

    41 

    42         if (!wb.areOpenArchiveHeapObjectsMapped()) {

    43             System.out.println("Archived open_archive_heap objects are not mapped.");

    44             System.out.println("This may happen during normal operation. Test Skipped.");

    45             return;

    46         }

    47 

    48         // CheckCachedResolvedReferencesApp is shared class and loaded by the

    49         // AppClassLoader. It should have cached resolved_references.

    50         if (wb.isSharedClass(CheckCachedResolvedReferencesApp.class)) {

    51             Object refs1 = wb.getResolvedReferences(CheckCachedResolvedReferencesApp.class);

    52             if (refs1 != null && wb.isShared(refs1)) {

    53                 System.out.println(

    54                     "resolved references from CheckCachedResolvedReferencesApp is cached");

    55             } else {

    56                 throw new RuntimeException(

    57                     "FAILED. CheckCachedResolvedReferencesApp has no cached resolved references");

    58             }

    59         }

    60 

    61         // Hello is shared class and loaded by the 'loader' defined in current app.

    62         // It should not have cached resolved_references.

    63         if (wb.isSharedClass(hello)) {

    64             Object refs2 = wb.getResolvedReferences(hello);

    65             if (refs2 != null) {

    66                 if (!wb.isShared(refs2)) {

    67                     System.out.println("resolved references from hello is not cached");

    68                 } else {

    69                     throw new RuntimeException(

    70                         "FAILED. Hello has unexpected cached resolved references");

    71                 }

    72             } else {

    73                 throw new RuntimeException("FAILED. Hello has no resolved references");

    74             }

    75         }

    76     }

    77 }