1 /* 2 * Copyright (c) 2017, 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 // Test that the error message is correct when a loader constraint error is 39 // detected during vtable creation. 40 // 41 // In this test, during vtable creation for class Task, method "Task.m()LFoo;" 42 // overrides "J.m()LFoo;". But, Task's class Foo and super type J's class Foo 43 // are different. So, a LinkageError exception should be thrown because the 44 // loader constraint check will fail. 45 public static void main(String args[]) throws Exception { 46 Class<?> c = Foo.class; // forces standard class loader to load Foo 47 ClassLoader l = new PreemptingClassLoader("Task", "Foo", "I"); 48 l.loadClass("Foo"); 49 try { 50 l.loadClass("Task").newInstance(); 51 throw new RuntimeException("Expected LinkageError exception not thrown"); 52 } catch (LinkageError e) { 53 if (!e.getMessage().contains( 54 "loader constraint violation for class Task: when resolving overriding method") || 55 !e.getMessage().contains( 56 "for its super type J have different Class objects for the type Foo")) { 57 throw new RuntimeException("Wrong LinkageError exception thrown: " + e.getMessage()); 58 } 59 } 60 } 61 62 } 63