JNI call to Intel or PPC arch jnilib function differs

Question

I am making a call from within Java to a jnilib function and get different logs on PPC and Intel. My function definitions are as follows:

private native int initHandler(long vendorID, long productID);

JNIEXPORT jint JNICALL Java_com_sue_protocol_SerialPortObserverThread_initHandler(
JNIEnv *env, jobject obj, jlong usbVendor, jlong usbProduct)

When initHandler() is called, the logs differ on the platforms:

Mac OS X/10.5.8/ppc, Java 1.5.0_22  
Looking for devices matching vendor ID=0 and product ID=7982.

Mac OS X/10.6.3/x86_64, Java 1.6.0_17
Looking for devices matching vendor ID=7982 and product ID=10.

The sample source for this project can be found on http://github.com/vinzenzweber/USBEventHandler

What do I need to do to get the JNI call right on ALL platforms?