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 /*

    26  * @test

    27  * @compile pkg/Grand.java pkg/Parent.java pkg/ClassLoaderForParentFoo.java

    28  * @compile pkg/ClassLoaderForChildGrandFoo.java pkg/Child.jasm

    29  * @run main/othervm LdrCnstrFldMsgTest

    30  */

    31 

    32 import java.lang.reflect.Method;

    33 

    34 // Check that LinkageError loader constraint message for fields contains the

    35 // correct information.

    36 //

    37 // The test creates two class loaders.  The first class loader loads classes

    38 // Child, Foo, and Grand.  The second class loader loads Parent and Foo.  Class

    39 // Parent is a sub-class of Grand and class Child is a sub-class of Parent.

    40 // Class Child tries to load Parent._field1.  This should fail because type Foo

    41 // for Parent._field1 is a different type than Child's Foo.

    42 //

    43 public class LdrCnstrFldMsgTest {

    44     public static void main(String... args) throws Exception {

    45         ClassLoader l = new pkg.ClassLoaderForChildGrandFoo("pkg.Foo", "pkg.Child", "pkg.Grand");

    46         l.loadClass("pkg.Foo");

    47 

    48         // Try to call a public method in Grand.

    49         Runnable r = (Runnable) l.loadClass("pkg.Child").newInstance();

    50         try {

    51             r.run();

    52             throw new RuntimeException("Expected LinkageError exception not thrown");

    53         } catch (java.lang.LinkageError e) {

    54             if (!e.getMessage().contains("for the field's defining type, pkg.Parent,") ||

    55                 !e.getMessage().contains("have different Class objects for type pkg.Foo")) {

    56                 throw new RuntimeException("Wrong LinkageError exception thrown: " + e.toString());

    57             }

    58         }

    59     }

    60 }