Calling a third-party library from JNI-enabled C++ code

Hi everyone,
I have some existing C++ application code that extracts data from a file in a special format (HDF5). This code uses a static library (third party) to decode the file format. I would like to wrap this application code in a JNI wrapper so that I can call the code from Java. So I have a situation like this:
Java front end -> application code (C++) -> static library (C++)
I have compiled JNI headers and modified the application code accordingly. I created a shared library by bundling the application code together with the static library (using gcc 3.2.2 on Red Hat Linux 9):
g++ -shared hdf5_jni.cc -o libhdf5_jni.so -I<include path> -L<static library path> -lhdf5
(the <static library path> contains the static library libhdf5.a). This creates a shared library which contains the application code and the relevant bits of the static library.
When I call the Java front end, the shared library (libhdf5_jni.so) is correctly found and accessed. However, I get an UnsatisfiedLinkError which I don't understand:
Exception in thread "main" java.lang.UnsatisfiedLinkError: <blah>/lib/libhdf5_jni.so: <blah>/lib/libhdf5_jni.so: undefined symbol: _Z4formPKcz
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1560)
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1485)
... etc
I have no idea what the undefined symbol "_Z4formPKcz" represents. It's not part of the application code or the static library.
Here's some more info that might help diagnosis:
1) The problem seems to be due to the approach of having a three-step process (Java code calling bespoke shared library which includes unmodified 3rd-party code). I get an identical error (including the mysterious "_Z4formPKcz" symbol) when trying to do something similar with a different 3rd-party static library.
2) When I simply have Java code calling C++ code which I have written myself (no calls to static library methods), I have no problems, i.e. there doesn't seem to be a problem with the way I set up the JNI wrappers or the application code, or in the way I create the shared library.
3) When I simply have C++ code calling the static libraries (i.e. no Java wrapper) I have no problems, i.e. there doesn't seem to be a problem with the application code or the static libraries.
4) The static libraries were compiled from source using the same compiler that I used to compile the application code.
5) I'm using J2SDK 1.4.2 on Red Hat Linux 9, although I've tried other versions of the SDK and had the same problem.
I've done a lot of web searches on the "_Z4formPKcz" symbol and have turned up absolutely nothing (zero Google hits!).
Any help would be very much appreciated.
Thanks, Jon

Thanks chrisswhite,
I should have mentioned that I tried this too and it didn't solve the problem. You're right though, I should be compiling with -fPIC anyway.
Jon

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