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Accessing Java Native Methods in WIndows and AIX environment

Posted on 2014-02-05
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Last Modified: 2014-02-13
I have logic written in Native Codes (C++) and I need to generate some file by which I can access those class methods in Java. The generated native file needs to run on windows and AIX environments.

What are the steps to do that?
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Question by:jgdvishnu
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Expert Comment

by:krakatoa
ID: 39836776
Why don't you Google JNI and JNA, and read up about it 'at source'?
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by:jkr
ID: 39836878
... a little bit more precise: http://www.codeproject.com/Articles/2876/JNI-Basics-1

This article and the follow-ups will introduce you on how to call native C/C++ code from Java via JNI. The prerequisites are that your C/C++ code are compiled into a DLL or shared library (for AIX), but that's pretty much it.

A little less brief is this document by IBM: http://www.carfield.com.hk/document/java/tutorial/jni_tutorial.pdf - quite an in-depth introduction into using JNI, will take quite more time to read that one compared to the other article.
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by:dpearson
ID: 39837940
JNI is certainly the right technology but it's very complex to build it by hand unless you have a very simple set of methods to support.  The complexity starts to come in when you wish to pass data back and forth between Java and C++, especially as they don't use the same memory allocation system.

For anything mildly complicated I'd suggest taking a good look at SWIG (http://www.swig.org/).  It's a toolkit designed to support interfacing C++ code to other languages - and Java is one of the supported ones.

If you look through the tutorials you can see how to use SWIG to generate the JNI code that you need.  Also using a tool like this has a huge advantage if you ever modify the C++ code that you are calling to because you can just press a button and regenerate the Java interface.

Hope that helps,

Doug
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Author Comment

by:jgdvishnu
ID: 39849066
Swig is the good tool but it has no user interface (Only command line).

I checked eclipse CPP but the problem is it does not have the libraries of C++ to run. To make this compile and run I installed MINGW(mingw-get-setup) but still the code did not recognise the compile.
MingW still fails to resolve the issue

Or Is there a free tool that has user interface and easy to make shared libraries/dll/exe)
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by:dpearson
ID: 39849305
I'm only familiar with SWIG, which as you say has no GUI.  It's command line only.

Doug
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Author Comment

by:jgdvishnu
ID: 39849823
Doug,

Is there a short step by step tutorial using swig to compile and run c++ code. I feel little rushed
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dpearson earned 500 total points
ID: 39850667
Have a go at:
http://swig.org/tutorial.html

It shows you how to get things running for a simple piece of C++ code that shouldn't take you more than a few minutes to try out.  (You can skip all of the other languages and just focus on the C++ and Java parts).

Doug
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by:jgdvishnu
ID: 39857017
thanks Doug,

I installed swig on windows however what additional software I need to run gcc commands.
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