1 /*

     2  * Copyright (c) 2015, 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 8046977 8065303

    27  * @summary ClassCastException: typing information needed for method reference bridging not preserved

    28  * @author Srikanth

    29  * @run main MethodReferenceGenericTarget

    30  */

    31 

    32 public class MethodReferenceGenericTarget {

    33     static String result = "";

    34 

    35     interface ISi { int m(Short a); }

    36 

    37     public static void main(String[] args) {

    38       (new MethodReferenceGenericTarget()).testUnboxObjectToNumberWiden();

    39       if (!result.equals("7775"))

    40           throw new AssertionError("Incorrect result");

    41         MethodReferenceTestPrivateTypeConversion.main(null);

    42         new InferenceHookTest().test();

    43     }

    44 

    45     void foo(ISi q) {

    46         result += q.m((short)75);

    47     }

    48 

    49     public void testUnboxObjectToNumberWiden() {

    50         ISi q = (new E<Short>())::xI;

    51         result += q.m((short)77);

    52         // Verify poly invocation context to confirm we handle

    53         // deferred/speculative attribution paths adequately.

    54         foo((new E<Short>())::xI);

    55     }

    56 

    57     class E<T> {

    58         private T xI(T t) { return t; }

    59     }

    60 }

    61 

    62 // snippet from https://bugs.openjdk.java.net/browse/JDK-8065303

    63 class MethodReferenceTestPrivateTypeConversion {

    64 

    65     class MethodReferenceTestTypeConversion_E<T> {

    66         private T xI(T t) { return t; }

    67     }

    68 

    69     interface ISi { int m(Short a); }

    70 

    71     interface ICc { char m(Character a); }

    72 

    73     public void testUnboxObjectToNumberWiden() {

    74         ISi q = (new MethodReferenceTestTypeConversion_E<Short>())::xI;

    75         if ((q.m((short)77) != (short)77))

    76             throw new AssertionError("Incorrect result");

    77     }

    78 

    79     public void testUnboxObjectToChar() {

    80         ICc q = (new MethodReferenceTestTypeConversion_E<Character>())::xI;

    81         if (q.m('@') != '@')

    82             throw new AssertionError("Incorrect result");

    83     }

    84 

    85     public static void main(String[] args) {

    86         new MethodReferenceTestPrivateTypeConversion().testUnboxObjectToNumberWiden();

    87         new MethodReferenceTestPrivateTypeConversion().testUnboxObjectToChar();

    88     }

    89 }

    90 

    91 class InferenceHookTestBase {

    92     <X> X m(Integer i) { return null; }

    93 }

    94 

    95 class InferenceHookTest extends InferenceHookTestBase {

    96     interface SAM1<R> {

    97         R m(Integer i);

    98     }

    99 

   100     <Z> Z g(SAM1<Z> o) { return null; }

   101 

   102     void test() {

   103         String s = g(super::m);

   104         if (s != null)

   105             throw new AssertionError("Incorrect result");

   106     }

   107 }