Packages and returned objects

Question

Hello,
I have several packages, one of which (call it package A) has three classes that are basically just structure classes(call them classes x, y, and z). Then in another package (package B), i have a function that creates and returns an object that is of class x type. this works just fine.
my problem comes when i have to use JNI to retrieve the object of type x. the following function call works fine (i think, doesnt return null):
jobject jPRData = env->CallObjectMethod(obj, mid, toTN);
now, i want to get the fields from this object. my problem is that ive tried to read it and it crashes.
     jobject jPRData = env->CallObjectMethod(obj, mid, toTN);
     if(jPRData == NULL){
          cout << "jPRData== null" << endl;
          killJVM();
     else
          cout << "found object method" << endl;
     jclass myClss = env->GetObjectClass(jPRData);
     if(env == NULL)
          cout << "env == NULL " << endl;
     else
          cout << "env okay" << endl;
     if(myClss == NULL)
          cout << "myclss is NULL" << endl;
     else {
          cout << "calling getfield" << endl;
          jfieldID myFid = env->GetFieldID(myClss, "clli", "com/intec/plantrecords/PairData");
          //CRASHES BEFORE RETURNING HERE
          cout << "back from getfieldid" << endl;
          if(myFid == NULL) {
               cout << "couldnt find field" << endl;
     }the error i get is:
Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object.
at getPairData(SByte* )
at main(Int32 argc, SByte** argv) in c:\documents and settings\..
but i have tested each item to see if they are null and they arent. just playing around i tried using the variable cls instead of myClss. and it just returns saying that it cant find the field. which is expected because its a different class reference. but i dont know why it is crashing w/ myClss.
uhmmm....help!? please... :)

Answer 1

just realized there was a mistake but even corrected it still crashed
jfieldID myFid = env->GetFieldID(myClss, "clli", "com/intec/plantrecords/PairData");
should be
jfieldID myFid = env->GetFieldID(myClss, "clli", "Ljava/lang/String;");
but i did change the way i found the class of the object. i used FindClass instead and it doesnt crash anymore. gotta convert data to c types and check values.