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  *          I.java
  29  *          ../common/J.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 LinkageError exceptions are not thrown during itable creation,
  39     // for loader constraint errors, if the target method is an overpass method.
  40     //
  41     // In this test, during itable creation for class C, method "m()LFoo;" for
  42     // C's super interface I has a different class Foo than the selected method's
  43     // type J.  But, the selected method is an overpass method (that throws an
  44     // ICCE). So, no LinkageError exception should be thrown because the loader
  45     // constraint check that would cause the LinkageError should not be done.
  46     public static void main(String... args) throws Exception {
  47         Class<?> c = Foo.class; // forces standard class loader to load Foo
  48         ClassLoader l = new PreemptingClassLoader("Task", "Foo", "C", "I");
  49         Runnable r = (Runnable) l.loadClass("Task").newInstance();
  50         try {
  51             r.run(); // Cause an ICCE because both I and J define m()LFoo;
  52             throw new RuntimeException("Expected ICCE exception not thrown");
  53         } catch (IncompatibleClassChangeError e) {
  54             if (!e.getMessage().contains("Conflicting default methods: I.m J.m")) {
  55                 throw new RuntimeException("Wrong ICCE exception thrown: " + e.getMessage());
  56             }
  57         }
  58     }
  59 }