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 // Break each expectedErrorMessage into 2 parts due to the class loader name containing 41 // the unique @<id> identity hash which cannot be compared against. 42 static String expectedErrorMessage1_part1 = "loader PreemptingClassLoader @"; 43 static String expectedErrorMessage1_part2 = 44 " (instance of PreemptingClassLoader, " + 45 "child of 'app' jdk.internal.loader.ClassLoaders$AppClassLoader) " + 46 "attempted duplicate class definition for test.Foo."; 47 48 49 // Check that all names have external formatting ('.' and not '/' in package names). 50 // Check for name and parent of class loader. 51 static String expectedErrorMessage2_part1 = "loader 'DuplicateLE_Test_Loader' @"; 52 static String expectedErrorMessage2_part2 = 53 " (instance of PreemptingClassLoader, " + 54 "child of 'app' jdk.internal.loader.ClassLoaders$AppClassLoader) " + 55 "attempted duplicate class definition for test.Foo."; 56 57 58 // Check that all names have external formatting ('.' and not '/' in package names). 59 // Check for name and parent of class loader. Type should be mentioned as 'interface'. 60 static String expectedErrorMessage3_part1 = "loader 'DuplicateLE_Test_Loader_IF' @"; 61 static String expectedErrorMessage3_part2 = 62 " (instance of PreemptingClassLoader, " + 63 "child of 'app' jdk.internal.loader.ClassLoaders$AppClassLoader) " + 64 "attempted duplicate interface definition for test.J."; 65 66 // Test that the error message is correct when a loader constraint error is 67 // detected during vtable creation. 68 // 69 // In this test, during vtable creation for class Task, method "Task.m()LFoo;" 70 // overrides "J.m()LFoo;". But, Task's class Foo and super type J's class Foo 71 // are different. So, a LinkageError exception should be thrown because the 72 // loader constraint check will fail. 73 public static void test(String loaderName, String expectedErrorMessage_part1, 74 String expectedErrorMessage_part2, String testType) throws Exception { 75 String[] classNames = {testType}; 76 ClassLoader l = new PreemptingClassLoader(loaderName, classNames, false); 77 l.loadClass(testType); 78 try { 79 l.loadClass(testType).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, "test.Foo"); 95 test("DuplicateLE_Test_Loader", expectedErrorMessage2_part1, expectedErrorMessage2_part2, "test.Foo"); 96 test("DuplicateLE_Test_Loader_IF", expectedErrorMessage3_part1, expectedErrorMessage3_part2, "test.J"); 97 } 98 } 99