1 /*
   2  * Copyright (c) 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 8199852
  27  * @summary Test exception messages of LinkageError. A class loader loads
  28  *          twice the same class. Should trigger exception in
  29  *          SystemDictionary::check_constraints().
  30  * @compile ../common/Foo.java
  31  * @compile ../common/J.java
  32  *          ../common/PreemptingClassLoader.java
  33  * @run main/othervm Test
  34  */
  35 
  36 public class Test {
  37 
  38     // Check that all names have external formatting ('.' and not '/' in package names).
  39     // Check for parent of class loader.
  40     static String expectedErrorMessage1 =
  41         "loader \"<unnamed>\" (instance of PreemptingClassLoader, " +
  42         "child of \"app\" jdk.internal.loader.ClassLoaders$AppClassLoader) " +
  43         "attempted duplicate class definition for test.Foo.";
  44 
  45     // Check that all names have external formatting ('.' and not '/' in package names).
  46     // Check for name and parent of class loader.
  47     static String expectedErrorMessage2 =
  48         "loader \"DuplicateLE_Test_Loader\" (instance of PreemptingClassLoader, " +
  49         "child of \"app\" jdk.internal.loader.ClassLoaders$AppClassLoader) " +
  50         "attempted duplicate class definition for test.Foo.";
  51 
  52     // Check that all names have external formatting ('.' and not '/' in package names).
  53     // Check for name and parent of class loader. Type should be mentioned as 'interface'.
  54     static String expectedErrorMessage3 =
  55         "loader \"DuplicateLE_Test_Loader_IF\" (instance of PreemptingClassLoader, " +
  56         "child of \"app\" jdk.internal.loader.ClassLoaders$AppClassLoader) " +
  57         "attempted duplicate interface definition for test.J.";
  58 
  59     // Test that the error message is correct when a loader constraint error is
  60     // detected during vtable creation.
  61     //
  62     // In this test, during vtable creation for class Task, method "Task.m()LFoo;"
  63     // overrides "J.m()LFoo;".  But, Task's class Foo and super type J's class Foo
  64     // are different.  So, a LinkageError exception should be thrown because the
  65     // loader constraint check will fail.
  66     public static void test(String loaderName, String expectedErrorMessage, String testType) throws Exception {
  67         String[] classNames = {testType};
  68         ClassLoader l = new PreemptingClassLoader(loaderName, classNames, false);
  69         l.loadClass(testType);
  70         try {
  71             l.loadClass(testType).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, "test.Foo");
  86         test("DuplicateLE_Test_Loader", expectedErrorMessage2, "test.Foo");
  87         test("DuplicateLE_Test_Loader_IF", expectedErrorMessage3, "test.J");
  88     }
  89 }
  90