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 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: when selecting overriding method test.Task.m()Ltest/Foo; " + 40 "the class loader instance of PreemptingClassLoader " + 41 "(parent: \"app\" jdk.internal.loader.ClassLoaders$AppClassLoader) of the selected method's type test.Task, " + 42 "and the class loader \"app\" (instance of jdk.internal.loader.ClassLoaders$AppClassLoader, " + 43 "parent: \"platform\" jdk.internal.loader.ClassLoaders$PlatformClassLoader) for its super type test.J " + 44 "have different Class objects for the type test.Foo used in the signature"; 45 46 static String expectedErrorMessage2 = 47 "loader constraint violation for class test.Task: when selecting overriding method test.Task.m()Ltest/Foo; " + 48 "the class loader \"VtableLdrCnstrnt_Test_Loader\" (instance of PreemptingClassLoader, " + 49 "parent: \"app\" jdk.internal.loader.ClassLoaders$AppClassLoader) of the selected method's type test.Task, " + 50 "and the class loader \"app\" (instance of jdk.internal.loader.ClassLoaders$AppClassLoader, " + 51 "parent: \"platform\" jdk.internal.loader.ClassLoaders$PlatformClassLoader) for its super type test.J " + 52 "have different Class objects for the type test.Foo used in the signature"; 53 54 // Test that the error message is correct when a loader constraint error is 55 // detected during vtable creation. 56 // 57 // In this test, during vtable creation for class Task, method "Task.m()LFoo;" 58 // overrides "J.m()LFoo;". But, Task's class Foo and super type J's class Foo 59 // are different. So, a LinkageError exception should be thrown because the 60 // loader constraint check will fail. 61 public static void test(String loaderName, String expectedErrorMessage) throws Exception { 62 Class<?> c = test.Foo.class; // Forces standard class loader to load Foo. 63 String[] classNames = {"test.Task", "test.Foo", "test.I"}; 64 ClassLoader l = new PreemptingClassLoader(loaderName, classNames); 65 l.loadClass("test.Foo"); 66 try { 67 l.loadClass("test.Task").newInstance(); 68 throw new RuntimeException("Expected LinkageError exception not thrown"); 69 } catch (LinkageError e) { 70 String errorMsg = e.getMessage(); 71 if (!errorMsg.equals(expectedErrorMessage)) { 72 System.out.println("Expected: " + expectedErrorMessage + "\n" + 73 "but got: " + errorMsg); 74 throw new RuntimeException("Wrong LinkageError exception thrown: " + errorMsg); 75 } 76 System.out.println("Passed with message: " + errorMsg); 77 } 78 } 79 80 public static void main(String args[]) throws Exception { 81 test(null, expectedErrorMessage1); 82 test("VtableLdrCnstrnt_Test_Loader", expectedErrorMessage2); 83 } 84 } 85