MacOSX / jni / jvm fmk 1.4.2 / passive long to a native static mtd get 0 !

Question

I am on MacOSX 10.3.8 working with the java framework 1.4.2.
I have a problem with the JNI by passing long to a static native method (a class method). It is ok with a non static native method.
The method is in a OnX.Test class with a signature :
public static native void nativeTestStatic(long jarg1);
which is declared in C++ :
extern "C" {
JNIEXPORT void JNICALL Java_OnX_Test_nativeTestStatic(JNIEnv* aEnv,jclass jcls,jlong jarg1) {
printf("debug : %d\n",jarg1);
The printf shows always 0 !!!!
I have seen that in a big application in which some C++ code is wrapped for java by using SWIG. And C++ pointers being mapped to long, I let you imagine the disaster...
Is it a "well known problem" ????
Regards

Answer 1

Hello
Sure, I have verified that. I have done various System.print
before the calls and within the JNI functions.
Moreover, I have now a simple test environment (then a Test.java
and a TestJNI.c) in which I pass numbers explicitly.
I have tried to pass directly like nativeFunc(123456) or doing :
long i = 123456;
nativeFunc(l);
I tried to pass big long numbers to be sure that I am not in some
tricky byteswapping situation. (sizeof(jlong) says 8 bytes for me).
What is interesting is that it is related to static methods (then class methods).
I do not see that on object methods ; here the longs are passed correctly.
Cheers