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JNI using Tomcat 5.5 under Mac OS X 10.4.9 on an intel mac.

Posted on 2007-03-20
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Last Modified: 2013-11-23
Does anybody have experience with JNI with tomcat under mac os (intel)? Probably not... :-) Anyway, I thought I'd give it a shot here...

I'm doing some web-development and just switched to a macbook pro from pc.  I've installed tomcat 5.5, and eclipse 3.2. The web application I'm building is using a native library written in c++, the library is compiled into a universal binary (libMyWrapper.jnilib) and works with a stand-alone java application on the same machine. When trying to load the library from tomcat i get an unsatisfied link error: java.lang.UnsatisfiedLinkError: no MyWrapper in java.library.path. So i printed the java.library.path to the console and put the required jnilib on all those places but it still didn't work. I've also tried to load the library using System.load() and the absolute path to the jnilib without result.

I hope anyone out there can help me!
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Question by:kveasana
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Expert Comment

by:Mayank S
ID: 18757210
>> So i printed the java.library.path to the console and put the required jnilib on all those places but it still didn't work.

Did you restart Tomcat after that? You need to....
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Author Comment

by:kveasana
ID: 18762462
Yes, I even restarted the machine...
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Author Comment

by:kveasana
ID: 18762697
It's working! Well kinda... I moved the jnilib to /usr/lib and loaded it with an absolute path using System.load("/usr/lib/libMyWrapper.jnilib");. (this only works if the jnilib is in /usr/lib and nowhere else)

The jnilib is dependent on a few other libraries, using otool i get the following output:

libMyWrapper.jnilib:
        libMyWrapper.jnilib (compatibility version 0.0.0, current version 0.0.0)
        /usr/lib/libiconv.2.dylib (compatibility version 5.0.0, current version 5.0.0)
        libxerces-c.dylib (compatibility version 0.0.0, current version 0.0.0)
        /usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version 7.4.0)
        /usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0)
        /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 88.3.4)

Even if I copy all these libraries to the java.class.path it doesn't work, could it be because of "recursive" dependency, i.e. the libSystem.B.dylib is dependent on a library outside the java.class.path?

On the other hand I added /usr/lib to the java.class.path and still it wouldn't load...

Any ideas?

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Mayank S earned 500 total points
ID: 18768876
You don't need to add it to java.class.path - you need to add it to java.library.path
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