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