JNI (Java Native Interface) tutorial for beginners

Introduction

This tutorial will brief explain to you how to create a simple resource access between your Java VM code and native OS

What you will learn:

• Create a shared library in C containing simple basic functions and simple resource to access your system
• Create your JNI library in C to access your shared library
• Compile JNI shared library, access your custom class, throw an Exception or Throwable through native code
• Integrate JNI to your Java or Kotlin
• Create a documentation for C using Doxygen
• Create a documentation for Java using Javadoc
• Integrate tests

Create a shared library in C containing simple basic functions

To create a native library in your OS system you need:

• Install a C compiler e.g.: gcc for unix system (Linux, Mac) or Visual Studio for Windows
• Install the latest version of Java 8 or 11 in your machine
• Clone this repository
• Run Make to compile this source code
• Run this example in your JVM

TODO ...

Compiling libraries

• Just type

cd <YOUR_PROJECT>/src/main/util && make

• To test your library

cd <YOUR_PROJECT>/src/main/util && make test

Cleaning compiled library

Just type in your src/main/util folder:

make clean

JNI and C library documentation

Sample example functions and used JNI functions are documented here

Contact

mailto: fabioegel@gmail.com

License

MIT