1 /*
2 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2018 SAP SE. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 */
24
25 /**
26 * @test
27 * @summary Test exception messages of LinkageError.
28 * @library /test/lib
29 * @compile D_ambgs.jasm
30 * @run driver ClassFileInstaller D_ambgs
31 * @compile ../common/PreemptingClassLoader.java
32 * D_ambgs.java Test.java B.java
33 * @run driver ClassFileInstaller B
34 * @run main/othervm Test
35 */
36
37 import java.io.ByteArrayOutputStream;
38 import java.io.InputStream;
39
40 import java.io.*;
41 import java.nio.file.Files;
42 import java.nio.file.Path;
43 import java.nio.file.Paths;
44
45 public class Test {
46
47 // Force LinkageError.
48 //
49 // Derived from test runtime/6626217.
50 //
51 // Uses the specialized class loader PreemptingClassLoader.
52 // PreemptingClassLoader only loads files with names passed to it in its
53 // constructor. If it does not find it, it delegates to the super class loader.
54 //
55 // A // interface
56 // |
57 // B // Compiled to the current working directory so that it is found by our
58 // // special class loader. B uses D, so that loading B triggers loading D.
59 //
60 // C // An abstract class.
61 // |
62 // D // Class with two different implementations D1 and D2. D2 is
63 // // compiled to the current working directory so that it is found by our
64 // // special class loader.
65 //
66 // First, the bootstrap loader will load D1. It already has loaded interface A.
67 // Then, the second class loader PreemptingClassLoader will load B. Recursive,
68 // it tries to load interface A. As it does not find it (there is no A.impl2),
69 // it asks the super classloader for A.
70 // Then it loads the D2 variant of D from the current working directory and it's
71 // superclass C. This fails as D1 is already loaded with the same superclass.
72
73 static String expectedErrorMessage =
74 "loader constraint violation: loader instance of PreemptingClassLoader " +
75 "(parent: \"app\" jdk.internal.loader.ClassLoaders$AppClassLoader) wants to load " +
76 "class D_ambgs. A different class with the same name was previously loaded " +
77 "by \"app\" (instance of jdk.internal.loader.ClassLoaders$AppClassLoader, " +
78 "parent: \"platform\" jdk.internal.loader.ClassLoaders$PlatformClassLoader).";
79
80 public static void test_access() throws Exception {
81 try {
82 // Make a Class 'D_ambgs' under the default loader.
83 // This uses the implementation from the .java file.
84 C c_1 = new D_ambgs();
85
86 // Some classes under a new Loader, loader2, including, indirectly,
87 // another version of 'D_ambgs'
88 String[] classNames = {"B", "D_ambgs"};
89
90 ClassLoader loader2 = new PreemptingClassLoader(null, classNames, false);
91 Class class2 = loader2.loadClass("B");
92 A iface = (A)class2.newInstance();
93
94 // Call D1.make() loaded by bootstrap loader with B loaded by Loader2.
95 D_ambgs[] x2 = c_1.make(iface);
96
97 throw new RuntimeException("Expected LinkageError was not thrown.");
98 } catch (LinkageError jle) {
99 String errorMsg = jle.getMessage();
100 if (!errorMsg.equals(expectedErrorMessage)) {
101 System.out.println("Expected: " + expectedErrorMessage + "\n" +
102 "but got: " + errorMsg);
103 throw new RuntimeException("Wrong error message of LinkageError.");
104 } else {
105 System.out.println("Passed with message: " + errorMsg);
106 }
107 }
108 }
109
110 public static void main(String[] args) throws Exception {
111 test_access();
112 }
113 }
114