1 /*
   2  * Copyright (c) 2017, 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.
   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  * @test
  26  * @bug 8186092 8199852
  27  * @compile ../common/Foo.java
  28  *          ../common/J.java
  29  *          I.java
  30  *          ../common/C.jasm
  31  *          Task.java
  32  *          ../common/PreemptingClassLoader.java
  33  * @run main/othervm Test
  34  */
  35 
  36 public class Test {
  37 
  38     // Break expected error messages into 2 parts since the loader name includes its identity
  39     // hash which is unique and can't be compared against.
  40     static String expectedErrorMessage1_part1 =
  41         "loader constraint violation for class test.Task: " +
  42         "when selecting overriding method test.Task.m()Ltest/Foo; " +
  43         "the class loader PreemptingClassLoader @";
  44     static String expectedErrorMessage1_part2 =
  45         " (instance of PreemptingClassLoader, " +
  46         "child of 'app' jdk.internal.loader.ClassLoaders$AppClassLoader) " +
  47         "of the selected method's type test.Task, " +
  48         "and the class loader 'app' (instance of jdk.internal.loader.ClassLoaders$AppClassLoader) " +
  49         "for its super type test.J " +
  50         "have different Class objects for the type test.Foo used in the signature";
  51 
  52     static String expectedErrorMessage2_part1 =
  53         "loader constraint violation for class test.Task: " +
  54         "when selecting overriding method test.Task.m()Ltest/Foo; " +
  55         "the class loader 'VtableLdrCnstrnt_Test_Loader' @";
  56     static String expectedErrorMessage2_part2 =
  57         " (instance of PreemptingClassLoader, " +
  58         "child of 'app' jdk.internal.loader.ClassLoaders$AppClassLoader) " +
  59         "of the selected method's type test.Task, " +
  60         "and the class loader 'app' (instance of jdk.internal.loader.ClassLoaders$AppClassLoader) " +
  61         "for its super type test.J " +
  62         "have different Class objects for the type test.Foo used in the signature";
  63 
  64     // Test that the error message is correct when a loader constraint error is
  65     // detected during vtable creation.
  66     //
  67     // In this test, during vtable creation for class Task, method "Task.m()LFoo;"
  68     // overrides "J.m()LFoo;".  But, Task's class Foo and super type J's class Foo
  69     // are different.  So, a LinkageError exception should be thrown because the
  70     // loader constraint check will fail.
  71     public static void test(String loaderName,
  72                             String expectedErrorMessage_part1,
  73                             String expectedErrorMessage_part2) throws Exception {
  74         Class<?> c = test.Foo.class; // Forces standard class loader to load Foo.
  75         String[] classNames = {"test.Task", "test.Foo", "test.I"};
  76         ClassLoader l = new PreemptingClassLoader(loaderName, classNames);
  77         l.loadClass("test.Foo");
  78         try {
  79             l.loadClass("test.Task").newInstance();
  80             throw new RuntimeException("Expected LinkageError exception not thrown");
  81         } catch (LinkageError e) {
  82             String errorMsg = e.getMessage();
  83             if (!errorMsg.contains(expectedErrorMessage_part1) || 
  84                 !errorMsg.contains(expectedErrorMessage_part2)) {
  85                 System.out.println("Expected: " + expectedErrorMessage_part1 + "<id>" + expectedErrorMessage_part2 + "\n" +
  86                                    "but got:  " + errorMsg);
  87                 throw new RuntimeException("Wrong LinkageError exception thrown: " + errorMsg);
  88             }
  89             System.out.println("Passed with message: " + errorMsg);
  90         }
  91     }
  92 
  93     public static void main(String args[]) throws Exception {
  94         test(null, expectedErrorMessage1_part1, expectedErrorMessage1_part2);
  95         test("VtableLdrCnstrnt_Test_Loader", expectedErrorMessage2_part1, expectedErrorMessage2_part2);
  96     }
  97 }
  98