long int Traverser(const char * sTraversingRoot);

public native long Traverser (String path),

JNIEXPORT jlong JNICALL Java_ParallelIndexation_Traverser(JNIEnv* env, jobject obj, jstring path)
{
    long int result;
    const jbyte* path2 = env->GetStringUTFChars(path, nullptr);
    if (path2 == nullptr)
        return;

    result=Traverser(path2);

    env->ReleaseStringUTFChars(path, path2);
    return result;
}