Access a java card via two logical channels

Dear all;
I was wondering if someone managed to do following setup(because it doesn't work for me):
I have an android phone with a sd-card slot in which I've inserted a java card. I can open a logical channel from my android phone to the java card. Since the java card also suports T=CL, I'm also able to open a logical channel from a pc to the java card via a contactless interface (with a reader that is connected to the pc). But what seams to be impossible is opening the two logical channels simultaniously. So I can't open simultaniously a logical channel from the android phone to the java card and a logical channel via the contactless interface.
Did anyone have succes with this setup? (I made the applet multiselectable)
greets,
JT

If you are trying to connect to the card over both the NFC controller (card emulation) and the device interface from Android at the same time you will probably have a race condition. On the phones I have used, you can only have one active at time.
Shane

Similar Messages

Supplementary logical channels and R-MAC on JCOP cards

Hi,
please, do current models of JCOP cards support supplementary logical channels ? I have found on forums infos saying both yes and no.
So maybe in earlier years, there was no support, now there is some.
I have found this post, which may clarify it a little bit:
All JCOP products have by default only the basic logical channel enabled. The reason is that it shall be GP compliant, and GP spec says that the CardManager must be multiple selectable if multiple logical channels are supported. The CM in JCOP is not multi selectable. If you don't care about GP compliancy (at least on this issue), you can set up to 4 logical channels during pre-perso (JCRE_MODE, two lowest bits).
However I don't know how to set the JCRE_MODE flags and what they are. I couldn't find any info on them.
Where are they located and described ? Which APDU command should I use to set them, and with which parameters ?
And a short second question - are there any JCOP cards, which support R-MAC, when communicating with the card manager ?
Thanks a lot,
Peter

PeterCZ wrote:
please, do current models of JCOP cards support supplementary logical channels ? I have found on forums infos saying both yes and no.
So maybe in earlier years, there was no support, now there is some.
I have found this post, which may clarify it a little bit:
All JCOP products have by default only the basic logical channel enabled. The reason is that it shall be GP compliant, and GP spec says that the CardManager must be multiple selectable if multiple logical channels are supported. The CM in JCOP is not multi selectable. If you don't care about GP compliancy (at least on this issue), you can set up to 4 logical channels during pre-perso (JCRE_MODE, two lowest bits).
However I don't know how to set the JCRE_MODE flags and what they are. I couldn't find any info on them.
Where are they located and described ? Which APDU command should I use to set them, and with which parameters ?JCOP supports supplementary logical channels, but it is switched off by NXP during production and can be re-enabled during pre-personalization (JCOP proprietary process). In order to do that, you need unfused cards and the corresponding transport key from NXP.
And a short second question - are there any JCOP cards, which support R-MAC, when communicating with the card manager ?No, JCOP does not support RMAC. Tell me a good reason why it should. I cannot think of any GP commands which would be worth protecting the response.

Logical Channels and Opening An Application

Hello,
Upon sending an APDU to a Java Card (a GEM card) to open a channel, it works fine. But when I try to select an application on that new logical channel which is in the secured state, it always gives back an error, but I can select that same application from the basic channel. Do I need to do something else besides simply opening the new logical channel to let it be able to select applications in the secured state?
Thanks,
Mizax

Hello,
Thanks for your response.
Yes I'm sure the card supports multiple logical channels, I've checked the historical bytes, and am able to open the number of logical channels the historical bytes say I should.
I can select other applications on the new logical channel and send commands to them, that works fine. When selecting a secured application, it fails with error code. In particular, I'm trying to select the card manage application, and that fails. Although this shouldn't be necessary, I make sure the basic channel doesn't have the card manager selected also:
Log:
Warm Reset Card
Open Logical Channel 1
Command: 00 70 00 01
Response: 90 00
Select some other App on the Basic Channel:
Command: 00 A4 04 00 0F A0 00 00 00 18 50 21 00 00 00 00 00 57 49 42
Response: 90 00
Select card manager on Channel 1:
Command: 01 A4 04 00 07 A0 00 00 00 18 43 4D
Response: 6E 00
To sum up: Open a new logical channel, select some other app on the basic channel, try to select the card manager on the new logical channel, it fails. If I then reselect the card manager on the basic channel, it works fine. I can select other non-secured apps on the new logical channel, and that works fine too. In any of the cases I mention, I ensure that only one channel is trying to select an app, so that I'm not worrying about the issue of whether an app is multi-selectable.
I've been wrestling and googling this for hours with no luck. Any help would be greatly appreciated.
Thanks,
Mizax

Is it possible to simulate whole java card application on simulator?

Hello all,
currently i dont have any real java card yet,not either reader . I already made a simple applet and check its working by CJCRE (net beans simulator), it is working fine,
now i want to move to host application which will communicate with java card via card reader. Is this possible to simulate complete application ( host application + java card applets)?
I want to check it out that:- which line of java program would be helpful to know that:-
1-"how real host application will talk to reader"
2- how it connect and disconnect the reader
3- how it send apdu to java card by reader
and much more.
I am using netbeans 7.1 and it is using CJCRE as a simulator....

you mean to say this
http://askra.de/software/jcdocs/app-notes-2.2.2/apduio.html
I am quite confused now, i read this but still can not imagine the concept ,
an applet code is :-
public class GetName extends Applet
     final static byte CLASS     = (byte) 0x80; // Class of the APDU commands
     final static byte INS_READ = (byte) 0x02; // instruction for the READ APDU command
     final static byte INS_WRITE = (byte) 0x03; // instruction for the READ APDU command
     final static byte INS_DY_CO = (byte) 0x04; // instruction for the READ APDU command
     final static byte[] text    = {(byte) 'A', (byte) 'M', (byte) 'I', (byte) 'T'};
     public static byte[] holder;
     public static void install(byte[] bArray, short bOffset, byte bLength)
        new GetName();
    protected GetName()
        holder = new byte[5];// allocation of memory in runtime
        register();
    public void process(APDU apdu)
          if(selectingApplet())
               return;
        byte[] cmd_apdu = apdu.getBuffer();
         if (cmd_apdu[ISO7816.OFFSET_CLA] == CLASS)
               switch(cmd_apdu[ISO7816.OFFSET_INS])
                    case INS_READ:
                    if ((cmd_apdu[ISO7816.OFFSET_P1] != 0) || (cmd_apdu[ISO7816.OFFSET_P2] != 0))
                    ISOException.throwIt(ISO7816.SW_WRONG_P1P2);
                    short le = (short)(cmd_apdu[ISO7816.OFFSET_LC] & 0x00FF);
                    short len_text = (short)text.length;
                    if (le != len_text)
                    ISOException.throwIt((short)(ISO7816.SW_CORRECT_LENGTH_00 + len_text));
                    apdu.setOutgoing();
                    apdu.setOutgoingLength((short)len_text);
                    apdu.sendBytesLong(text, (short)0, (short)len_text);
                    break;
                // here we save data from apdu and will keep inside the data byte
                    case INS_WRITE:
                short lc = (short)(cmd_apdu[ISO7816.OFFSET_LC] & 0x00FF);
                Util.arrayCopy(cmd_apdu, (short) ((ISO7816.OFFSET_CDATA) & 0xff), holder, (short) 0, lc);
                    short len_holder_inside_write= (short) holder.length;
                   apdu.setOutgoing();
                apdu.setOutgoingLength((short)len_holder_inside_write);
                apdu.sendBytesLong(holder, (short) 0, (short) len_holder_inside_write);
                break;
                case INS_DY_CO:
                    short len_holder= (short) holder.length;
                apdu.setOutgoing();
                apdu.setOutgoingLength((short)len_holder);
                apdu.sendBytesLong(holder, (short) 0, (short) len_holder);
                break;
                    default :
                    ISOException.throwIt(ISO7816.SW_INS_NOT_SUPPORTED);
         else
                ISOException.throwIt(ISO7816.SW_CLA_NOT_SUPPORTED);
}now i think i need to make a another java file which would contain a main class, Is this both file would be inside a single java card project. and how these both would be connect to each other.
for manually run a applet- there were two steps 1-
C:\java_card_kit-2_2\samples\src\demo>jcwde jcwde-getname.app
Java Card 2.2 Workstation Development Environment (version 0.18).
Copyright 2002 Sun Microsystems, Inc. All rights reserved.
jcwde is listening for T=0 Apdu's on TCP/IP port 9,025.
and in second terminal we wrote-
C:\java_card_kit-2_2\samples\src\demo>apdutool -nobanner -noatr getname.scr > ge
tname.scr.jcwde.out
Here it is clear that, if i will use javacardio then no need to pass the apdu from a file .....but i am confuse about how it possible, ie. is both file lie in same project , because i m using simulator so i need to run these both file simoltaneously........give me some roughly steps to implement this.

JavaCard applications on SIM accessing personal Java applications

Are personal java applications also applets just like Java Card Applets.
Also i am programming the SIM of the mobile phone which is a Java Card.
How can a Personal java application on the phone communicate with a JavaCard application on the card or vice versa. Please Note that for the user they are similar.i.e. they exist side-by-side on the same menu of the phone with the user having no clue that the application resides on the phone ( a personal java application) or on the card( a javacard application).
Can anyone tell me of some way for one personal java application to access a JavaCard application?
Thanks
SKhan

At the moment there exist no way to access the Java Card / smartcard in a J2ME/personal Java device. Currently we are working in JSR177 on the problem.

Firewall - Java Card project with two packages.

My Java Card project has got two Java Card packages. One of them contains only the Java Card applet. The other package contains all other classes. We did the splitting because our application is large and if all the code is left inside the one package if debug mode was checked, the size of the cap file was more than 64 bytes and the CAP file with that size cannot be installed inside the simulator. That situation made the programming difficult. Therefore the splitting took place. What is my question? If we have two packages, is there a firewall between them or the packages are in the same group context.

A library package has different restrictions to an applet package. As for the firewall, the data created in your library package is owned by the applet instance that created it. That means any data or objects created by calling your library from your applet will be in the same context as your applet. Any other applet accessing this library will not be able to access instances from the original context. This is only a problem with static fields and methods etc that are shared between both applets.
Cheers,
Shane

Accessing Java System - Via SAPRouter

Hi,
Is it possible to access the NetWeaver component via SAPRouter.If yes please provide the settings to be done in saprouter and how to access BI java part in web browser.
Thanks,
Vignesh P

Hi,
>My Question is how to access http://192.168.xxx.xxx:50000/irj/index.html from out side network.
I don't think that it is possible for us, SAP customers, to use the saprouter as an HTTP gateway.
It is, of course, possible for SAP support but I don't know how they do it. I've never found a documentation about it.
There must be something special because a standard web browser does not know what to do whith a saprouter.
The official solution for external HTTP access is to use a reverse proxy like the SAP Web dispatcher or Apache.
This works perfectly for us. In one case, we have a saprouter (for sapgui access) and an Apache reverse proxy (for BSP browser access) on the same host in a DMZ.
Regards,
Olivier

Trying to access the java script files via jar file in WEB SERVER

hi all,
I am trying to access the java script files via jar file ,which is present in Apache webserver in order to minimise the number of hits to app server.some thing like cache ...
in jsp the code goes like this...
<script type="text/javascript" archive="http://localhost:14000/dojo.jar!" src="dojo.jar/parser.js" " ></script>{code}
But i am not able to access the js file which is put in jar file present in the webserver.

Hi,
You can use DWR (Direct Web remoting) for that. It is easy AJAX for java. ou can directly call the java script function from java class and also java class from javaScripts..
Regards,
Hardik

Does java api allow access the ethernet card directly

i m working on cluster computing. i like to code in java. i need to send object from one single machine to other machines in a university computer lab. i would like to send the objects very efficiently and fastly. i used java.net and also java.nio. but i think it would be fast more if i could directly access the ethernet card- read from and write to the network interface card directly.

does java api allow access the ethernet card directlyNo.

Java Card 2.2.2 draft is out for public review

A draft for the upcoming release of the Java Card Specification is available for public review.
The Java Card 2.2.2 Specification will provide numerous enhancements to the award-winning Java Card platform. In particular it will include specific support for contactless communication and ID cards :
* enhancements to ease the management and increase interoperability of contactless cards.
* additional cryptography and security features
* utility APIs for memory-efficient applet development
Java Card technology v2.2.2 is ready for the next generations of smart card standards, and is fully backward-compatible with previous versions.
New features in Java Card 2.2.2 :
* Utility APIs for TLV, BCD, short, int
* ISO7816-based Extended length APDU support
* Support for up to 20 logical channels
* External memory access API
* Multiple Interfaces management
* Additional cryptography algorithms : HMAC-MD5, HMAC-SHA1, SHA-256 and Korean Seed
* Signature with message recovery
* Partial message digest
* Standardized Biometrics API
Please direct your comments on this draft at [email protected] Feedback received before December 15th will be considered for the final version of the specification. For more information on the Java Card Platform Specification v2.2.2, Public Review Draft, refer to the release notes on http://java.sun.com/products/javacard/RELEASENOTES_jcspecsp.html

The Installer and the Applet Deletion Manager are implemented in the JCRE and GlobalPlatform. On-card the Card Manager manages the content management, communication and the related security. JCRE specifies how it has to handle installation and deletion, but leaves room for different implementations. To the outside world, on a GP card, the Installer/ADM is the Card Manager with a specific AID.
Installer and ADM are optional. For instance a Java Card Static product does not need an Installer/ADM.
JCOP cards have the Installer/ADM fully implemented. It uses the GP functionality. The CM has to be selected to install or delete a package/applet.

How to ensure applet is written in java card?

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

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.

Default applets on brand new java card and spec support

Hi,
I have got brand new java card reader and real java card.
I want to just access it using Java and see if I can access stuff on the java card before i go ahead with next things.
I was thinking of just doing select on some applet which is present on brand new java card by default.
1. Does anyone know if any default applet is present on java card?
2. If yes, AID of that?
3. Is there any APDU by which I can find out which java card spec that card supports?
Btw, I am using Java Card 2.2.2 and the card i have should also have same support.
Edited by: unic.man on Jul 12, 2008 2:11 AM

>
1. I know that any smart-card has a universally unique id which can be retrieved pro grammatically. Can you please tell me the APDU/API to retrieve it on Host app side? If not, card side at least?
I don't know much about unique IDs but basically you've got the ATR which is given to you every time the card is powered on. The ATR identifies a particular family of cards. If you want to identify each card you need to have a look at the GET DATA command (in Global Platform) and especially the CPLC (Card Production Life Cycle). Apparently you can get a unique ID by combining the IC batch identifier and the IC serial number.
2. I'm also struggling with deploying the app. It is not detecting the default installer applet via apdutool. I found some articles and netbeans plug-in talking about keys to download applet on card. Do you know standard keys/derivated keys to start secured channel?I don't think you can use the JCDK to install an applet on a real card. If you have a JCOP card I advise you to get the JCOP tools. And yes you will need the keys to establish a secure channel but I don't know what the default keys are on a JCOP card.

Java Card Manager NetBeans plug-in

Just to announce, I've uploaded a simple plug-in for NetBeans that provides basic functionality for Java Cards. Send APDU commands to card or simulator, browse content loaded on card, load & install & delete applets, open secure channel... Plug-in follows Open platform specification.
It has been used with GemXpresso cards (and works well) so there is no experience with other cards, but suppose that the card is OP compliant, it should work ok.
I have some ideas to improve and to extend it to support full OP/GP specs as well as plug-in for Java Card project type. However, I have no idea about what Sun prepares as tools with JC3.0 (I've noticed that it will be NB plug-ins too).
http://plugins.netbeans.org/PluginPortal/faces/PluginDetailPage.jsp?pluginid=10935

Hello, neinaggar1.
Well, on NetBeans plug-in portal, I've uploaded Java Card Manager plug-in. This plug-in brings to NetBeans the possibility to communicate (APDU commands, installing applets, etc.) with card or running simulator; no project types.
In comments on plug-in discussion, i.e. http://plugins.netbeans.org/PluginPortal/faces/PluginDetailPage.jsp?pluginid=10935 , I've put a link to second plug-in Java Card Project that provides the "project" functionality - new project type (new project type category "Java Card"), code completion, compiling, converting, starting simulator... However, this plug-in is in "beta" stage because it has some unsolved pitfalls - for example, you can provide just one export path for converting and there is a problem with plug-in depedency to internal NetBeans modules so it is strongly dependent on certain ide version (and probably even on its build).
Check the link above and discussion present there.
Just a note:
the access to the functionality Java Card Manager plug-in is from "Service" tab.
the access to the functionality Java Card Project plug-in is from properties (right click on the project name in project treeview) of existing java card project made by this plug-in or via new project wizard to make a new java card project.
Edited by: Vlasakcz on Aug 1, 2008 7:24 AM

Logical Channel problem

Hi, everybody in the forum, I'm a beginner in these fields.
While I'm using JCOP debugger simulating JCOP41v22, I found that Logical Channel 1,2,3 is opened by default In Java Card specs I found that only channel 0 must be open by default. Is there any rule that these 3 channels must be opened or closed on card reset, or is it depend on card manufacture?

Hi,
check thsi link, u can get an idea[http://help.sap.com/saphelp_nw70/helpdata/en/60/183d78163011d2953c0000e8353423/content.htm]

Is the Java Card Platform supports the unnamed package?

1.agree
Virtual Machine Specification for the Java Card� Platform, Version 2.2.1 chapter 2.2.2.1:
"packages in the Java Card platform are used exactly the way they are in the Java platform."
That means the Java Card platform also have two type package,named package and unnamed package.
2.against
Development Kit User�s Guide for the Java Card Platform, Version 2.2.1 chapter Running the Converter:
"Command line usage of the Converter is:
converter [ options] <package_name> < package_aid> < major_version>.
< minor_version>"
The above formula tells us that the <package_name> is a MUST Line Arguments of converter.But if we create a unnamed package,how should we express it?
3.against
first,How a real JCVM intall/organize the unnamed packages?
second,In a real JCVM run-time environment,all java items(include attribute,method and soon) refered by the suit of package+class+item.In this condition,the item in a nunamed package cannot offers the package and is never refered.
I have been botherd by the above 3 boresome and opposite points for some time and cannot give out the key of the question.
Can some one give me some ideas?
thx!

Sun's kit is free. There is a reference implementation of the JC Runtime environment with the kit.
You of course can't load that onto a card. And even if you had the RE, you won't be able to load onto a card because the RE is burned into the ROM which you don't have low level access to.
Read the JCRE specs that come with the kit

Access a java card via two logical channels

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