Hi,
 
I am doing a project on content-based image retrieval. I wonder if you could answer an urgent question which bothered me for weeks on JNI.
 
Right now, I am trying to call openCV facedetection function to my original Java program. The C code can be built successfully to a dll file, and the Java program is able to deal with the simple function given by the C code. But when the Java file encounters the lines like:  
"IplImage* image = cvLoadImage( filename, 1 );"
or  
" faces = cvHaarDetectObjects( image, cascade, storage, 1.1, 2, CV_HAAR_DO_CANNY_PRUNING, cvSize(40, 40) );",  
JVM will output an error like this:  
 
# An unexpected error has been detected by Java Runtime Environment:
#
#  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x0000955c, pid=3164, tid=2344
#
# Java VM: Java HotSpot(TM) Client VM (1.6.0_02-b06 mixed mode)
# Problematic frame:
# C  0x0000955c
 
I suppose the problem could be the cvLoadImage and cvHaarDetectObjects returned a null C pointer which JVM cannot accept. But can I get rid of the null pointer like this?
 
I am truly looking foward to your reply.