Gemalto TOP GX4 cards - does they support Shareable interface?

Question

Hello.
I am trying to implement SIO in my applet. There is an interface
package persistentStorage;
import javacard.framework.*;
public interface DataReadWriteInterface extends Shareable {
     public byte readByte(short address);
     public void writeByte(short address, byte value);
}and the class, that implements this interface
package persistentStorage;
import javacard.framework.APDU;
import javacard.framework.Applet;
import javacard.framework.ISO7816;
import javacard.framework.ISOException;
import javacard.framework.Util;
public class PersistentStorage extends Applet implements DataReadWriteInterface {
     private static final byte CLA_PERSISTENT_STORAGE = (byte) 0xD0;
     private static final byte INS_INITIALIZE_EEP = (byte) 0x01;
     private byte[] eeprom = new byte[200];
     private boolean initialized = false;
     protected PersistentStorage(byte[] bArray, short bOffset, byte bLength) {
          byte aidLen = bArray[bOffset];
          if (aidLen == (byte) 0) {
               register();
          } else {
               register(bArray, (short) (bOffset + 1), aidLen);
     public void process(APDU apdu) throws ISOException {
          byte[] buffer = apdu.getBuffer();
          if (this.selectingApplet()) {
               return;
          if (buffer[ISO7816.OFFSET_CLA] != CLA_PERSISTENT_STORAGE) {
               ISOException.throwIt(ISO7816.SW_CLA_NOT_SUPPORTED);
          switch (buffer[ISO7816.OFFSET_INS]) {
          case INS_INITIALIZE_EEP:
               processInitializeEEP(apdu, buffer);
               break;
          default:
               ISOException.throwIt(ISO7816.SW_INS_NOT_SUPPORTED);
               break;
     private void processInitializeEEP(APDU apdu, byte[] buffer) {
          if (initialized) {
               ISOException.throwIt(ISO7816.SW_INS_NOT_SUPPORTED);
          Util.arrayCopy(buffer, ISO7816.OFFSET_CDATA, eeprom, (short) 0,
                    buffer[ISO7816.OFFSET_LC]);
      * Applet installation
      * @param bArray
      * @param bOffset
      * @param bLength
      * @throws ISOException
     public static void install(byte bArray[], short bOffset, byte bLength)
               throws ISOException {
          new PersistentStorage(bArray, bOffset, bLength);
     public byte readByte(short address) {
          return eeprom[address];
     public void writeByte(short address, byte value) {
          eeprom[address] = value;
        public Shareable getShareableInterfaceObject(AID clientAID, byte parameter) {
          return this;
}Everything is succefully compiled and converted. But on one of subsequent LOAD APDU commands, card throws
Wrapped command --> 80E602001C09A04652414354414C0108A000000018434D000006EF04C6020FB00000
Response <-- 6985
install_for_load() returns 0x80206985 (6985: Command not allowed - Conditions of use not satisfied.)
Does TOP javacards support Shareable interface? Because if I remove it, card accepts applet without problems. Or may be I did something wrong?
UPD: I can see the same problem discussed here: http://forums.sun.com/thread.jspa?forumID=23&threadID=5362492
Edited by: FractalizeR on 15.07.2010 17:29
Edited by: FractalizeR on 15.07.2010 17:51

Answer 1

Oh sorry I forgot to mention this. That was obvious for me :(
Yes, the interface shall be in the card before the calling applet and defined in the "server" package. There is a direct dependency at link time (= when you load the cap file).
The "server" applet is classical, and just implements the interface. .java files produces .class files and conversion produces a .cap and a .exp for the package.
Then, to build the "client" applet, you compile using the server's classes, and convert using the EXP from the server.
The server cap must be loaded and instanciated before the client cap.
Regards
PS: you can instruct the converter to produce JCA files, which are disassembled CAP files. They contain important information about these packages dependencies in human readable format.