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.lang.instrument.ClassDefinition;

    26 import java.lang.instrument.Instrumentation;

    27 import java.lang.instrument.UnmodifiableClassException;

    28 import java.net.URL;

    29 import java.net.URLClassLoader;

    30 import java.io.File;

    31 import java.security.CodeSigner;

    32 import java.security.CodeSource;

    33 import java.security.ProtectionDomain;

    34 import sun.hotspot.WhiteBox;

    35 

    36 public class RedefineClassApp {

    37     static WhiteBox wb = WhiteBox.getWhiteBox();

    38 

    39     public static interface Intf {            // Loaded from Boot class loader (-Xbootclasspath/a).

    40         public String get();

    41     }

    42     public static class Bar implements Intf { // Loaded from Boot class loader.

    43         public String get() {

    44             return "buzz";

    45         }

    46     }

    47     public static class Foo implements Intf { // Loaded from AppClassLoader

    48         public String get() {

    49             return "buzz";

    50         }

    51     }

    52 

    53     static int numTests = 0;

    54     static int failed = 0;

    55     static Instrumentation instrumentation;

    56 

    57     public static void main(String args[]) throws Throwable {

    58         if (wb.areSharedStringsIgnored()) {

    59           System.out.println("Shared strings are ignored.");

    60           return;

    61         }

    62 

    63         File bootJar = new File(args[0]);

    64         File appJar  = new File(args[1]);

    65 

    66         instrumentation = InstrumentationRegisterClassFileTransformer.getInstrumentation();

    67         System.out.println("INFO: instrumentation = " + instrumentation);

    68 

    69         testBootstrapCDS("Bootstrap Loader", bootJar);

    70         testAppCDSv1("Application Loader", appJar);

    71 

    72         if (failed > 0) {

    73             throw new RuntimeException("FINAL RESULT: " + failed + " out of " + numTests + " test case(s) have failed");

    74         } else {

    75             System.out.println("FINAL RESULT: All " + numTests + " test case(s) have passed!");

    76         }

    77 

    78         // Full GC. The cached objects in adjustable archive heap regions are

    79         // scanned. The archive regions are verified. No error should be

    80         // reported.

    81         wb.fullGC();

    82     }

    83 

    84     static void testBootstrapCDS(String group, File jar) throws Throwable {

    85         doTest(group, new Bar(), jar);

    86     }

    87 

    88     static void testAppCDSv1(String group, File jar) throws Throwable {

    89         doTest(group, new Foo(), jar);

    90     }

    91 

    92     static void doTest(String group, Intf object, File jar) throws Throwable {

    93         numTests ++;

    94 

    95         Class klass = object.getClass();

    96         System.out.println();

    97         System.out.println("++++++++++++++++++++++++++");

    98         System.out.println("Test group: " + group);

    99         System.out.println("Testing with classloader = " + klass.getClassLoader());

   100         System.out.println("Testing with class       = " + klass);

   101         System.out.println("Test is shared           = " + wb.isSharedClass(klass));

   102         System.out.println("++++++++++++++++++++++++++");

   103 

   104         // Call get() before redefine. All strings in archived classes are shared.

   105         String res = object.get();

   106         System.out.println("get() returns " + res);

   107         if (res.equals("buzz") && wb.isShared(res)) {

   108             System.out.println("get() returns " + res + ", string is shared");

   109         } else {

   110             if (!res.equals("buzz")) {

   111                 System.out.println("FAILED. buzz is expected but got " + res);

   112             } else {

   113                 System.out.println("FAILED. " + res + " is not shared");

   114             }

   115             failed ++;

   116             return;

   117         }

   118         res = null; // release the local reference to the string

   119 

   120         // Run GC

   121         System.gc();

   122         System.gc();

   123         System.gc();

   124 

   125         // Redefine the shared class

   126         byte[] buff = Util.getClassFileFromJar(jar, klass.getName());

   127         Util.replace(buff, "buzz", "huzz");

   128         String f = "(failed)";

   129         try {

   130             instrumentation.redefineClasses(new ClassDefinition(klass, buff));

   131             f = object.get();

   132         } catch (UnmodifiableClassException|UnsupportedOperationException e) {

   133             e.printStackTrace();

   134         }

   135         if (f.equals("huzz")) {

   136             System.out.println("PASSED: object.get() after redefinition returns " + f);

   137         } else {

   138             System.out.println("FAILED: object.get() after redefinition returns " + f);

   139             failed ++;

   140         }

   141 

   142         // Run GC. Should not crash.

   143         System.gc();

   144         System.gc();

   145         System.gc();

   146 

   147         System.out.println("++++++++++++++++++++++++++++++++++++++++++++++++ (done)\n\n");

   148     }

   149 }