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 static String expectedErrorMessage1 = 39 "loader constraint violation for class test.Task: " + 40 "when selecting overriding method test.Task.m()Ltest/Foo; " + 41 "the class loader \"<unnamed>\" (instance of PreemptingClassLoader, " + 42 "child of \"app\" jdk.internal.loader.ClassLoaders$AppClassLoader) " + 43 "of the selected method's type test.Task, " + 44 "and the class loader \"app\" (instance of jdk.internal.loader.ClassLoaders$AppClassLoader) " + 45 "for its super type test.J " + 46 "have different Class objects for the type test.Foo used in the signature"; 47 48 static String expectedErrorMessage2 = 49 "loader constraint violation for class test.Task: " + 50 "when selecting overriding method test.Task.m()Ltest/Foo; " + 51 "the class loader \"VtableLdrCnstrnt_Test_Loader\" (instance of PreemptingClassLoader, " + 52 "child of \"app\" jdk.internal.loader.ClassLoaders$AppClassLoader) " + 53 "of the selected method's type test.Task, " + 54 "and the class loader \"app\" (instance of jdk.internal.loader.ClassLoaders$AppClassLoader) " + 55 "for its super type test.J " + 56 "have different Class objects for the type test.Foo used in the signature"; 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, String expectedErrorMessage) throws Exception { 66 Class<?> c = test.Foo.class; // Forces standard class loader to load Foo. 67 String[] classNames = {"test.Task", "test.Foo", "test.I"}; 68 ClassLoader l = new PreemptingClassLoader(loaderName, classNames); 69 l.loadClass("test.Foo"); 70 try { 71 l.loadClass("test.Task").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); 86 test("VtableLdrCnstrnt_Test_Loader", expectedErrorMessage2); 87 } 88 } 89