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 RedefineAddLambdaExpression
  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         MathOperation addition = (int a, int b) -> a + b;
  47         return operate(10, 5, addition);
  48     }
  49 }
  50 
  51 public class RedefineAddLambdaExpression {
  52 
  53     public static String newB =
  54         "class B {" +
  55         "    public static int operate(int a, int b, MathOperation mathOperation) {" +
  56         "        return mathOperation.operation(a, b);" +
  57         "    }" +
  58         "    static int test_math(String p) {" +
  59         "        MathOperation addition = (int a, int b) -> a + b;" +
  60         "        System.out.println(p + \" from class B's test_math method\");" +
  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 }