Running native code in Java

Uses JNI to call a library that implements code that runs on the native platform.

Based on http://mrjoelkemp.com/2012/01/getting-started-with-jni-and-c-on-osx-lion/.

See https://github.com/abauman-7signal/jni-basic for source code that more closely matches the above example.

This project takes the above example and goes further by

• Packaging the HelloWorld JNI code into a JAR
• Creating the native interface to be part of Java package Note: The signature of the C++ methods must reflect the name of the Java package that wraps the C++ library.

Prerequisites

• JDK is installed
• GNU g++ is installed. This was already the case since I was developing on a Mac.

Building the source

$ ./build.sh

Running the functional test

$ cd build
$ java -cp .:helloworld.jar -Djava.library.path=lib com.sevensignal.mosfunctionaltester.TestJni

should print the following to standard out: Oh JNI, how cumbersome you are!

Note: Java needs to know the location of the JAR file and the path to the library.