How to ensure applet is written in java card?

Question

Hi all,
I have written a java card applet, in which i am using the Biometry API of java card to enroll a fingerprint template in java card. Code is attached below:
package classicapplet1;
import javacard.framework.*;
import javacardx.biometry.BioBuilder;
import javacardx.biometry.OwnerBioTemplate;
import javacardx.biometry.SharedBioTemplate;
import javacardx.biometry.BioException;
public class JavaBiometrics extends Applet implements SharedBioTemplate{
        public final static byte CLA = (byte)0xCF;
     public final static byte INS_ENROLL = (byte)0x10;
     public final static byte MATCH_TRY_LIMIT = (byte)3;
     public final static byte INVALID_DATA = (byte)0x77;
     public final static byte ERROR_MATCH_FAILED = (byte)0x9101;
     public static final byte CARD_ENROLL_SUCCESS = (byte)0x9000;
     public static final byte CARD_ENROL_FAILED = (byte)0x6900;
     private OwnerBioTemplate bio_temp;
     * Installs this applet.
     * @param bArray
     *            the array containing installation parameters
     * @param bOffset
     *            the starting offset in bArray
     * @param bLength
     *            the length in bytes of the parameter data in bArray
    public static void install(byte[] bArray, short bOffset, byte bLength) {
        new JavaBiometrics(bArray, bOffset, bLength);
     * Only this class's install method should create the applet object.
    protected JavaBiometrics(byte[] bArray, short bOffset, short bLength) {
    byte aidLen = bArray[bOffset];
          if(aidLen == (byte)0)
               register();
          else
               register(bArray, (short)(bOffset+1), aidLen);
          bio_temp = BioBuilder.buildBioTemplate(BioBuilder.FINGERPRINT, MATCH_TRY_LIMIT);
public boolean select()
return true;
     * Processes an incoming APDU.
     * @see APDU
     * @param apdu
     *            the incoming APDU
    public void process(APDU apdu) {
        //get the incoming APDU buffer
     byte []buffer = apdu.getBuffer();
     //Get the CLA; mask out the logical-channel info
     buffer[ISO7816.OFFSET_CLA] = (byte)(buffer[ISO7816.OFFSET_CLA] & (byte)0xFC);
     //If the INS Select, return -no need to process select
     if(buffer[ISO7816.OFFSET_CLA] == 0 && buffer[ISO7816.OFFSET_INS] == (byte)(0xA4))
          return;
     //If unrecognized class, return "Unsupported class."
     if(buffer[ISO7816.OFFSET_CLA] != CLA)
          ISOException.throwIt(ISO7816.SW_CLA_NOT_SUPPORTED);
     switch(buffer[ISO7816.OFFSET_INS])
     case INS_ENROLL:
          enroll(apdu);
          break;
     default:
          ISOException.throwIt(ISO7816.SW_INS_NOT_SUPPORTED);
public void enroll(APDU apdu)
        byte[] buffer = apdu.getBuffer();
        short bytesRead = apdu.setIncomingAndReceive();
        bio_temp.init(buffer, ISO7816.OFFSET_CDATA, bytesRead);
        bio_temp.doFinal();
    public Shareable getShareableInterfaceObject(AID clientAID, byte parameter) {
        return this;
///////////// These methods implemets the ShareableBio interface///////////////
public boolean isInitialized() {
        return bio_temp.isInitialized();
    public boolean isValidated() {
        return bio_temp.isValidated();
    public void reset() {
        bio_temp.reset();
    public byte getTriesRemaining() {
        return bio_temp.getTriesRemaining();
    public byte getBioType() {
        return bio_temp.getBioType();
    public short getVersion(byte[] dest, short offset) {
        return bio_temp.getVersion(dest, offset);
    public short getPublicTemplateData(short publicOffset, byte[] dest, short destOffset, short length)
            throws BioException {
        return bio_temp.getPublicTemplateData(publicOffset, dest, destOffset, length);
    public short initMatch(byte[] candidate, short offset, short length) throws BioException {
        return bio_temp.initMatch(candidate, offset, length);
    public short match(byte[] candidate, short offset, short length) throws BioException {
        return bio_temp.match(candidate, offset, length);
Problem :
I have developed this program in Netbeans using java card plug ins. when i am running this program, all the required CAP files and EXP files are generated.
Now, i have to write this applet on java card through a card reader. My card reader is installed in an embedded system GeoAmida with IP 192.133.133.2 and port number 6789.
I have used the following settings for my java card device in Netbeans:
Host : 192.133.133.2
Server URL: http://192.133.133.2:6789/
Card Manager URL: http://192.133.133.2:6789/cardmanager/
HTTP port: 6789
The output shows me that Instances of this program has been successfully has been created on java card.
But the problem is how can i ensure that my applet is been successfully installed on the java card?
The code of host application program, accessing the developed java card applet is given below (it is written in C):
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <smartcard.h>
int main()
     int ret, i, smartcard;
     unsigned char applet_id[100], apdu_len, apdu[300],response[300]={0};
     smartcard_info *context;
     smartcard=CONTACTLESS;
     //smartcard=CONTACT_BOT;
     if((context = smartcard_init(smartcard)) == NULL){
          printf("Smartcard Initi. Failed\n");
          return 0xBB;
     /* checking for smartcard */
     while (1){
          if(ret=smartcard_is_present(context, smartcard)!=0)
               sleep(1);
          else
               break;
     printf("Selecting Applet \n");
     i = 0;
     applet_id[i++]=0x00; applet_id[i++]=0xA4; applet_id[i++]=0x04; applet_id[i++]=0x00; applet_id[i++]=0x06;
     applet_id[i++]=0xA9; applet_id[i++]=0xBF; applet_id[i++]=0xA2; applet_id[i++]=0xB6; applet_id[i++]=0xB1; applet_id[i++]=0x3E; applet_id[i++]=0x7F;
     if ((ret=smartcard_select_applet(context, smartcard, applet_id, i))!=0){
          printf("select applet failed %02x\n",ret);
          return ;
     printf("Applet Selection Success \n");
#if 1
     i=0;
     apdu[i++]=0xCF; apdu[i++]=0x10; apdu[i++]=0x04; apdu[i++]=0x04; apdu[i++]=0x7F;
     //apdu[i++]=0x3F; apdu[i++]=0x00;
     apdu_len = i;
     printf("Sending APDU command\n");
     if ((ret=smartcard_apdu(context, smartcard, apdu, apdu_len, response))!=0){
          printf("apdu failed %d\n",ret);
          //return;
     }else
          printf("APDU Success\n");
     //printf("\n");
#endif
     smartcard_deinit(context);
     return 0;     
}The output of this program is showing me that applet is been successfully selected, but APDU selection failed. Please solve this problem as soon as possible, because my project is deadline is not very much far.
Thanks in advance.
Mukul Gupta

Answer 1

Hi Shane,
I am getting error 6a86 which means that value of P1 is less than 1 or more than 8, and we have to change its value to any in between 1 to 8. I did that also but error still remains :(
Please tell me what is reason behind this error. And, i'll try out your previous solution today, Thanks for it.