Tentei usar o SIO (Shareable Interface Objects) para dois pacotes diferentes para atualizar a lógica comercial do meu applet no futuro. Estou usando o eclipse e inicio dois aplicativos JavaCard diferentes, ClientSIOApplet e ServerSIOApplet. Há um pacote chamado appClient no ClientSIOApplet e um pacote appServer no ServerSIOApplet. Além disso, ClientApplet.java e ServerAppBankInterface.java são classes em appClient e ServerAppBankInterface.java e ServerApplet.java estão em appServer. Você pode ver o código fonte abaixo:

ClientApplet.java no appClient

package appClient;

import javacard.framework.AID;
import javacard.framework.APDU;
import javacard.framework.Applet;
import javacard.framework.ISO7816;
import javacard.framework.ISOException;
import javacard.framework.JCSystem;
import javacard.framework.Shareable;
import javacard.framework.Util;

public class ClientApplet extends Applet {

    Shareable  sio;

    byte[] serverAID = {(byte)0x01, (byte)0x02, (byte)0x03, (byte)0x04, (byte)0x05, (byte)0x01};

    public ClientApplet() {
        // TODO Auto-generated constructor stub

    }

    public static void install(byte[] bArray, short bOffset, byte bLength) {
        // GP-compliant JavaCard applet registration
        new ClientApplet().register(bArray, (short) (bOffset + 1),
                bArray[bOffset]);       
    }

    public void process(APDU apdu) {
        // Good practice: Return 9000 on SELECT
        if (selectingApplet()) {
            return;
        }
        byte[] buf = apdu.getBuffer();      
        byte cla = buf[ISO7816.OFFSET_CLA];

        if (( cla != ISO7816.CLA_ISO7816) && (cla != (byte) 0x10))
            ISOException.throwIt(ISO7816.SW_CLA_NOT_SUPPORTED);

        switch (buf[ISO7816.OFFSET_INS]) {
        case (byte) 0x00:


             AID svrAid = JCSystem.lookupAID(serverAID, 
                                     (short)0, 
                                     (byte)serverAID.length);

            if(svrAid == null) {
                // Cannot find the serverAID AID
                ISOException.throwIt((short)0x0010);
            }

            /*sio = JCSystem.getAppletShareableInterfaceObject(svrAid, (byte)0);
            if (sio == null) ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
            if (! (sio instanceof SharedArray))
                ISOException.throwIt(ISO7816.SW_INS_NOT_SUPPORTED);
            SharedArray theSharedArray = (SharedArray) sio;
            final byte[] sa = theSharedArray.getSharedArray();*/

            //ISOException.throwIt(ISO7816.SW_COMMAND_NOT_ALLOWED);

            sio = JCSystem.getAppletShareableInterfaceObject(svrAid, (byte)0);


            if(sio == null){
                ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
            }


            /*if (! (sio instanceof ServerAppBankInterface))
                ISOException.throwIt(ISO7816.SW_FILE_INVALID);*/

           , try{
                ServerAppBankInterface bankInterface = (ServerAppBankInterface) sio;
            }catch(Exception ex){
                ISOException.throwIt(ISO7816.SW_WRONG_P1P2);
            }


                        break;
        //default:
            // good practice: If you don't know the INStruction, say so:
            //ISOException.throwIt(ISO7816.SW_INS_NOT_SUPPORTED);
        }
    }

}

ServerAppBankInterface.java no appClient

package appClient;

import javacard.framework.Shareable;

public interface ServerAppBankInterface extends Shareable{
    //public void saveMoneyInBank(short amount);
    public short getSavedMoneyInBank();
}

ServerApplet.java no appServer

package appServer;

import javacard.framework.AID;
import javacard.framework.APDU;
import javacard.framework.Applet;
import javacard.framework.ISO7816;
import javacard.framework.ISOException;
import javacard.framework.Shareable;


public class ServerApplet extends Applet implements ServerAppBankInterface{



    public ServerApplet(byte[] bArray, short bOffset, byte bLength){

        register(bArray, (short) (bOffset + 1), bArray[bOffset]);

        /*final byte[] sa = new byte[] { 'm' };
        sharedArray = new SharedArrayImpl(sa);*/
    }

    public Shareable getShareableInterfaceObject(AID clientID, byte parameter){

        byte[] tempAID = {(byte)0x05, (byte)0x04, (byte)0x03, (byte)0x02, (byte)0x01, (byte)0x01};

        if((clientID.equals(tempAID,
                (short)0,
                (byte)tempAID.length)) == false)
            return  null;
        else
            return this;
            //return sharedArray;
            //return serverAppBankObject;
            //return (ServerAppBankInterface) this;
            //return (Shareable) this;

    }

    public boolean select()
    {
         return true;
    }

    public static void install(byte[] bArray, short bOffset, byte bLength) {
        // GP-compliant JavaCard applet registration
        new ServerApplet(bArray, bOffset, bLength);
    }

    public void process(APDU apdu) {
        // Good practice: Return 9000 on SELECT

        byte[] buf = apdu.getBuffer();
        switch (buf[ISO7816.OFFSET_INS]) {
        case (byte) 0x00:
            break;
        default:
            // good practice: If you don't know the INStruction, say so:
            ISOException.throwIt(ISO7816.SW_INS_NOT_SUPPORTED);
        }
    }

    public short getSavedMoneyInBank() {
        // TODO Auto-generated method stub
        return 0;
    }



}

ServerAppBankInterface.java em appServer

package appServer;

import javacard.framework.Shareable;

public interface ServerAppBankInterface extends Shareable{
    //public void saveMoneyInBank(short amount);
    public short getSavedMoneyInBank();
}

O problema é:

Estou com problemas de interface de conversão na linha:

ServerAppBankInterface bankInterface = (ServerAppBankInterface) sio;

em ClientApplet.java

Se eu excluir o Try-Catch nessa linha, recebo o erro 0x6F00,