facerec.dll for windows 8 x64, for EigenFaceRecognizer

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Hey,

I need to write a face recognition program in java but I can't seem to succesfully create the facerec.dll.

I already wrote the Java class:

public class EigenFaceRecognizer extends FaceRecognizer { static { System.loadLibrary("facerec"); }

private static native long createEigenFaceRecognizer_0();
private static native long createEigenFaceRecognizer_1(int num_components);
private static native long createEigenFaceRecognizer_2(int num_components, double threshold);

public EigenFaceRecognizer () {
    super(createEigenFaceRecognizer_0());
}
public EigenFaceRecognizer (int num_components) {
    super(createEigenFaceRecognizer_1(num_components));
}
public EigenFaceRecognizer (int num_components, double threshold) {
    super(createEigenFaceRecognizer_2(num_components, threshold));
}

}

But, as I said earlier, I can't create the facerec.dll for it and I'm trying for a couple of days and nothing is working.

I have opencv 2.4.8 extracted (C:\opencv), jdk 8_11 (C:\Program Files\Java\jdk1.8.0_11), mingw for windows 64 bits, windows 8 64 bits as operating system and netbeans 8.

Thx

If I try:

g++ facerec.cpp -I"C:\opencv\build\include" -I"C:\Program Files\Java\jdk1.8.0_11\include" -I"C:\Program Files\Java\jdk1.8.0_11\include\win32" -L"C:\opencv\build\x64\vc11\lib" -lopencv_contrib248 -lopencv_core248 -lopencv_ml248 -o facerec.dll

I get:

C:\Users\Robert\AppData\Local\Temp\ccVvdrS9.o:facerec.cpp:(.text+0x4c): undefine d reference to cv::createFisherFaceRecognizer(int, double)' C:\Users\Robert\AppData\Local\Temp\ccVvdrS9.o:facerec.cpp:(.text+0x101): undefin ed reference tocv::createFisherFaceRecognizer(int, double)' C:\Users\Robert\AppData\Local\Temp\ccVvdrS9.o:facerec.cpp:(.text+0x1b5): undefin ed reference to cv::createFisherFaceRecognizer(int, double)' C:/Program Files/mingw-w64/x86_64-4.9.1-win32-seh-rt_v3-rev0/mingw64/bin/../lib/ gcc/x86_64-w64-mingw32/4.9.1/../../../../x86_64-w64-mingw32/bin/ld.exe: C:\Users \Robert\AppData\Local\Temp\ccVvdrS9.o: bad reloc address 0x0 in section.pdata$ _ZN7JNIEnv_9FindClassEPKc' collect2.exe: error: ld returned 1 exit status