Re: Debuggin JNI UnsatisfiedLinkError

Hi,

I'm looking for ideas / techniques to debug JNI UnsatisfiedLinkError on Mac OS X

I'm trying to use a huge package, OpenCASCADE, which is an Open Source Solid Modeling Package written in C++. It's pretty mature and has been compiled succesfully on various Linuxes ans Windows. The build process is pretty much standard GNU make. Can't say it has been easy, but with I have been able to compile it on Mac OS with minimal changes. When I say huge, I mean it has some +5000 source modules taking up 170 MB on my disk, it takes almost five hours to compile on my 2 GHz Dual Core, when compiled it produces about 130 dynamic libraries in my /usr/local/lib. So it is a major piece of software and thus trying to track a problem, any problem, is, well, problematic.

A Java port is, sort of, available. The make system for the Java bindings is not as mature as the rest of the package but I've managed to compile it.

But when I try to use the library I get UnsatisfiedLinkError.

My test program is simply:

public class Main {

public static void main(String[] args) {

System.loadLibrary("jcas");

}

}

I'm pretty confident that the loadLibrary() actually finds the file (named 'libjcas.jnilib') as if I change the name I get a different variant of the same exception.

I've set my DYLD_LIBRARY_PATH

/Users/nyholku/occ-java/Jni/Darwin,/usr/local/lib,/usr/lib

I've used otool -L on the 'libjcas.jnilib' to find out the dependencies and that file seems to refer almost all of the OpenCASCADE libries in the /usr/local/lib, but hey, no problem, they are there and they are on the library path.

I've set the following variables to see what happens:

DYLD_PRINT_BINDINGS,DYLD_PRINT_LIBRARIES,DYLD_PRINT_LIBRARIES_POST_LAUNCH

and a huge listing is produced indicating that most of the libries are loaded and a lot of binding does happen. But the final climax is missing, I still get the UnsatisfiedLinkError.

So now I'm a little at loss on how to dig deeper. Obviously the project is too large for trial and error unless I can prune to problem down somehow.

But how, that is the question?

How can I found out what is missing or if something else is the problem?

I may add that I've tried a simple hello/jni in an attempt to verify that my link compile process is ok. I've also tried to 'empty' the jcas library so that it does not refer to anything and in this case the library compiles and links, runs and loads ok. So I think my compile/link process is ok. The only suspect is  that I need to use -ObjCpp flag to compile as the one of the awt files is by necessity Objective C. But I trust this is not the problem? Or could it be?

br Kusti

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