CalculatorJNI

A simple C++ sum calculator executed from Java through JNI.

Build and run using Docker

1. Change your local workspace directory

   $ cd your-clone-path/CalculatorJNI

2. Build Docker image from Dockerfile with tag calculatorjni-docker

   $ docker build --tag calculatorjni-docker .

3. Run Docker image and connect to bash

   $ docker run -it calculatorjni-docker

4. Start program in Docker shell

   $ sh run.sh "8.5" "1.5"

   Output:

   Execute program ...
   Sum (8.500000, 1.500000) = 10.000000
   

Build

1. Compile Java code - build.sh

$ javac src/com/ricgra/Calculator.java

$ javac -h . src/com/ricgra/Calculator.java

2. Compile C++ code and create .so - cpp/build.sh

$ mv com_ricgra_Calculator.h cpp/

$ export JAVA_INCLUDE_PATH=/your/jdk/include/folder/path/

$ g++ -std=c++11 -shared -fPIC -I$JAVA_INCLUDE_PATH -I$JAVA_INCLUDE_PATH/linux src/CalculatorImpl.cpp -o libcalculator.so

Run

Execute sum - run.sh

$ java -cp ./src/ -Djava.library.path=./cpp/ com/ricgra/Calculator "1" "2"