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 3 parts since the loader name includes its identity
  39     // hash which is unique and can't be compared against.
  40     static String expectedErrorMessage1_part1 = "loader constraint violation for class test.Task: when " +
  41                                                 "selecting overriding method 'test.Foo test.Task.m()' the " +
  42                                                 "class loader PreemptingClassLoader @";
  43     static String expectedErrorMessage1_part2 = " of the selected method's type test.Task, and the class " +
  44                                                 "loader 'app' for its super type test.J have different Class objects " +
  45                                                 "for the type test.Foo used in the signature (test.Task is in unnamed " +
  46                                                 "module of loader PreemptingClassLoader @";
  47     static String expectedErrorMessage1_part3 = ", parent loader 'app'; test.J is in unnamed module of loader 'app')";
  48 
  49     static String expectedErrorMessage2_part1 = "loader constraint violation for class test.Task: when " +
  50                                                 "selecting overriding method 'test.Foo test.Task.m()' the " +
  51                                                 "class loader 'VtableLdrCnstrnt_Test_Loader' @";
  52     static String expectedErrorMessage2_part2 = " of the selected method's type test.Task, and the class " +
  53                                                 "loader 'app' for its super type test.J have different Class objects " +
  54                                                 "for the type test.Foo used in the signature (test.Task is in unnamed " +
  55                                                 "module of loader 'VtableLdrCnstrnt_Test_Loader' @";
  56     static String expectedErrorMessage2_part3 = ", parent loader 'app'; test.J is in unnamed module of loader 'app')";
  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,
  66                             String expectedErrorMessage_part1,
  67                             String expectedErrorMessage_part2,
  68                             String expectedErrorMessage_part3) throws Exception {
  69         Class<?> c = test.Foo.class; // Forces standard class loader to load Foo.
  70         String[] classNames = {"test.Task", "test.Foo", "test.I"};
  71         ClassLoader l = new PreemptingClassLoader(loaderName, classNames);
  72         l.loadClass("test.Foo");
  73         try {
  74             l.loadClass("test.Task").newInstance();
  75             throw new RuntimeException("Expected LinkageError exception not thrown");
  76         } catch (LinkageError e) {
  77             String errorMsg = e.getMessage();
  78             if (!errorMsg.contains(expectedErrorMessage_part1) ||
  79                 !errorMsg.contains(expectedErrorMessage_part2) ||
  80                 !errorMsg.contains(expectedErrorMessage_part3)) {
  81                 System.out.println("Expected: " + expectedErrorMessage_part1 + "<id>" + expectedErrorMessage_part2 + "\n" +
  82                                    "but got:  " + errorMsg);
  83                 throw new RuntimeException("Wrong LinkageError exception thrown: " + errorMsg);
  84             }
  85             System.out.println("Passed with message: " + errorMsg);
  86         }
  87     }
  88 
  89     public static void main(String args[]) throws Exception {
  90         test(null, expectedErrorMessage1_part1,
  91              expectedErrorMessage1_part2, expectedErrorMessage1_part3);
  92         test("VtableLdrCnstrnt_Test_Loader", expectedErrorMessage2_part1,
  93              expectedErrorMessage2_part2, expectedErrorMessage2_part3);
  94     }
  95 }