1 /*
 2  * Copyright (c) 2018, 2019, 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  * @requires vm.jvmti
29  * @library /test/lib
30  * @modules java.base/jdk.internal.misc
31  * @modules java.compiler
32  *          java.instrument
33  *          jdk.jartool/sun.tools.jar
34  * @run main RedefineClassHelper
35  * @run main/othervm -javaagent:redefineagent.jar -XX:+AllowRedefinitionToAddDeleteMethods -Xlog:redefine+class*=trace RedefineSubtractLambdaExpression
36  */
37 
38 interface MathOperation {
39     public int operation(int a, int b);
40 }
41 
42 class B {
43     public static int operate(int a, int b, MathOperation mathOperation) {
44         return mathOperation.operation(a, b);
45     }
46     static int test_math(String p) {
47         System.out.println(p + " from class B's test_math method");
48         MathOperation subtraction = (int a, int b) -> a - b;
49         MathOperation addition = (int a, int b) -> a + b;
50         return operate(10, 5, addition);
51     }
52 }
53 
54 public class RedefineSubtractLambdaExpression {
55 
56     public static String newB =
57         "class B {" +
58         "    public static int operate(int a, int b, MathOperation mathOperation) {" +
59         "        return mathOperation.operation(a, b);" +
60         "    }" +
61         "    static int test_math(String p) {" +
62         "        MathOperation subtraction = (int a, int b) -> a - b;" +
63         "        return operate(10, 5, subtraction);" +
64         "    }" +
65         "}";
66 
67     public static void main(String[] args) throws Exception {
68         int res = B.test_math("Hello");
69         System.out.println("Result = " + res);
70         if (res != 15) {
71             throw new Error("test_math returned " + res + " expected " + 15);
72         }
73         RedefineClassHelper.redefineClass(B.class, newB);
74 
75         res = B.test_math("Hello");
76         if (res != 5)
77             throw new Error("test_math returned " + res + " expected " + 5);
78     }
79 }