Java HotSpot Virtual Machine

I have a global JNIEnv and jobject in C++; I have those values in C++ class from JNI wraper. I used env->GetObjectClass in C++ to get jclass, but when I call env->GetMethodID, I got "unhandled exception in java.exe (JVM.dll):0xC0000005: Access Violation"

The code is running under VC++6.0 debug mode.

Here is what I am trying to do: Whenever the event occurs in C++ class, I need to call one of JNI wraper method.

Can anybody help? Or have any ideas about calling JNI wraper from C++ events class?

Thanks