Weird GetFieldID return value

Question

Hi,
I have a problem where GetFieldID returns weird values, that is not NULL. Those values, when further used in Get<Type>Field, crashes my program.
Below my small test program.
#include <jni.h>
#include <jni_md.h>
#include <windows.h>
JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *vm, void *reserved)
    return JNI_VERSION_1_2;
JNIEXPORT void JNICALL JNI_OnUnload(JavaVM *vm, void *reserved)
    return;
void main()
    JavaVM *jvm=NULL;
    JavaVMInitArgs args;
    JNIEnv *env=NULL;
    int rc=0;
    jclass testClass;
     jfieldID field;
jvalue jv;
jobject obj;
jmethodID meth;
jbyte b;
         args.version = JNI_VERSION_1_2;
   //JNI_GetDefaultJavaVMInitArgs(&args);
    args.nOptions = 0;
    args.options = NULL;
    args.ignoreUnrecognized = JNI_FALSE;
     rc=JNI_CreateJavaVM(&jvm, (void**)&env,&args);
    if(rc != 0)
        printf( "JNI_CreateJavaVM failure");
        exit(1);
     testClass=(*env)->FindClass(env,"java/util/Vector");
    printf("FindClass java/util/Vector %p\n",testClass);
    field=(*env)->GetFieldID(env,testClass,"capacityIncrement","I");
    printf("GetFieldID %p\n",field);
     testClass=(*env)->FindClass(env,"java/lang/Byte");
    printf("FindClass java/lang/Byte %p\n",testClass);
    field=(*env)->GetFieldID(env,testClass,"value","B");
    printf("GetFieldID %p\n",field);
    field=(*env)->GetStaticFieldID(env,testClass,"MIN_VALUE","B");
    printf("GetStaticFieldID %p\n",field);
     jv.b=0x73;
     meth=(*env)->GetMethodID(env,testClass,"<init>","(B)V");
    printf("GetMethodID %p\n",meth);
     obj=(*env)->NewObjectA(env,testClass,meth,&jv);
    printf("obj %p\n",obj);
     b=(*env)->GetByteField(env,obj,field);
    printf("b= %x\n",b);
exit(0);
}I tested it on W2K, using Sun JSK 1.3.01 and 1.4b2. Althought the return value arent the same, here what is writtent to the console, befoire the crash that occurs xhen calling GetByteField :
FindClass java/util/Vector 00955D28
GetFieldID 00000016
FindClass java/lang/Byte 00955D2C
GetFieldID 0000000A
GetStaticFieldID 00AE7B50
GetMethodID 00AE7B78
obj 00955D30
You can see that fieldIDs does not look like pointer values, whereas other methodIDs and class/object refs are OK.
Any idea ???

Answer 1

Hey, guys !
Stop doing strange things !
Let's see your code:
field=(*env)->GetStaticFieldID(env,testClass,"MIN_VALUE","B");
b=(*env)->GetByteField(env,obj,field);
Anothere SEVERE ERROR - you try get STATIC FIELD by using wrong function !
Your function must be:
NativeType GetStatic<type>Field(JNIEnv *env, jclass clazz,
jfieldID fieldID);
STATIC !!!
Good luck!