UnsatisfiedLinkError -- Missing underscore in _Java prefix?

[John Kelty]

Hi All,

I'm getting the familiar JNI error UnsatisfiedLinkError. In my particular case, the code works fine on Linux, but I get that dreaded error on Windows. I suspect its something to do with the build options. I'm using MinGW to build.

I compile with options like this:
g++ -ggdb -c -U_WIN32 -D_JNI_IMPLEMENTATION_ -Wall TestUtilities.cpp

and link like this:
g++ -shared -D_JNI_IMPLEMENTATION_ -Wl --kill-at --add-stdcall-alias -o JNI_API.dll TestUtilities.o Manager.o -lstdc++ -lws2_32

Finally, a DLL export viewer shows my function names beginning with "Java_", but I believe when I used to build this under VisualStudio, the names began with "_Java".

Any ideas?

[John Kelty]

Well, it seems like this may have been a stumper. I found a hack around it, by defining this macro:

#ifdef  WIN32
#define JNI_PREFIX( x ) _ ## x
#else
#define JNI_PREFIX( x ) x
#endif

and using it like this:

JNIEXPORT void JNICALL JNI_PREFIX(Java_package_class_Method)(JNIEnv *env, jobject obj, jstring foo) {
}

--John