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     static String expectedErrorMessage1 =
  39         "loader constraint violation for class test.Task: " +
  40         "when selecting overriding method test.Task.m()Ltest/Foo; " +
  41         "the class loader \"<unnamed>\" (instance of PreemptingClassLoader, " +
  42         "child of \"app\" jdk.internal.loader.ClassLoaders$AppClassLoader) " +
  43         "of the selected method's type test.Task, " +
  44         "and the class loader \"app\" (instance of jdk.internal.loader.ClassLoaders$AppClassLoader) " +
  45         "for its super type test.J " +
  46         "have different Class objects for the type test.Foo used in the signature";
  47 
  48     static String expectedErrorMessage2 =
  49         "loader constraint violation for class test.Task: " +
  50         "when selecting overriding method test.Task.m()Ltest/Foo; " +
  51         "the class loader \"VtableLdrCnstrnt_Test_Loader\" (instance of PreemptingClassLoader, " +
  52         "child of \"app\" jdk.internal.loader.ClassLoaders$AppClassLoader) " +
  53         "of the selected method's type test.Task, " +
  54         "and the class loader \"app\" (instance of jdk.internal.loader.ClassLoaders$AppClassLoader) " +
  55         "for its super type test.J " +
  56         "have different Class objects for the type test.Foo used in the signature";
  57 
  58     // Test that the error message is correct when a loader constraint error is
  59     // detected during vtable creation.
  60     //
  61     // In this test, during vtable creation for class Task, method "Task.m()LFoo;"
  62     // overrides "J.m()LFoo;".  But, Task's class Foo and super type J's class Foo
  63     // are different.  So, a LinkageError exception should be thrown because the
  64     // loader constraint check will fail.
  65     public static void test(String loaderName, String expectedErrorMessage) throws Exception {
  66         Class<?> c = test.Foo.class; // Forces standard class loader to load Foo.
  67         String[] classNames = {"test.Task", "test.Foo", "test.I"};
  68         ClassLoader l = new PreemptingClassLoader(loaderName, classNames);
  69         l.loadClass("test.Foo");
  70         try {
  71             l.loadClass("test.Task").newInstance();
  72             throw new RuntimeException("Expected LinkageError exception not thrown");
  73         } catch (LinkageError e) {
  74             String errorMsg = e.getMessage();
  75             if (!errorMsg.equals(expectedErrorMessage)) {
  76                 System.out.println("Expected: " + expectedErrorMessage + "\n" +
  77                                    "but got:  " + errorMsg);
  78                 throw new RuntimeException("Wrong LinkageError exception thrown: " + errorMsg);
  79             }
  80             System.out.println("Passed with message: " + errorMsg);
  81         }
  82     }
  83 
  84     public static void main(String args[]) throws Exception {
  85         test(null, expectedErrorMessage1);
  86         test("VtableLdrCnstrnt_Test_Loader", expectedErrorMessage2);
  87     }
  88 }
  89