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  * @test

    26  * @bug 8193524

    27  * @summary Redefine a class' public static method that contains a lambda expression

    28  * @library /test/lib

    29  * @modules java.base/jdk.internal.misc

    30  * @modules java.compiler

    31  *          java.instrument

    32  *          jdk.jartool/sun.tools.jar

    33  * @run main RedefineClassHelper

    34  * @run main/othervm -javaagent:redefineagent.jar -Xlog:redefine+class*=trace RedefineSubtractLambdaExpression

    35  */

    36 

    37 interface MathOperation {

    38     public int operation(int a, int b);

    39 }

    40 

    41 class B {

    42     public static int operate(int a, int b, MathOperation mathOperation) {

    43         return mathOperation.operation(a, b);

    44     }

    45     static int test_math(String p) {

    46         System.out.println(p + " from class B's test_math method");

    47         MathOperation subtraction = (int a, int b) -> a - b;

    48         MathOperation addition = (int a, int b) -> a + b;

    49         return operate(10, 5, addition);

    50     }

    51 }

    52 

    53 public class RedefineSubtractLambdaExpression {

    54 

    55     public static String newB =

    56         "class B {" +

    57         "    public static int operate(int a, int b, MathOperation mathOperation) {" +

    58         "        return mathOperation.operation(a, b);" +

    59         "    }" +

    60         "    static int test_math(String p) {" +

    61         "        MathOperation subtraction = (int a, int b) -> a - b;" +

    62         "        return operate(10, 5, subtraction);" +

    63         "    }" +

    64         "}";

    65 

    66     public static void main(String[] args) throws Exception {

    67         int res = B.test_math("Hello");

    68         System.out.println("Result = " + res);

    69         if (res != 15) {

    70             throw new Error("test_math returned " + res + " expected " + 15);

    71         }

    72         RedefineClassHelper.redefineClass(B.class, newB);

    73 

    74         res = B.test_math("Hello");

    75         if (res != 5)

    76             throw new Error("test_math returned " + res + " expected " + 5);

    77     }

    78 }