Problem in catching UserException

I have a problem in catching UserException in the JavaCard RMI demo of purse client from the Development Kit. The error that i'm getting is this, instead of catching the UserException:
Exception in thread "main" java.lang.UnsatisfiedLinkError: com.sun.javacard.impl.NativeMethods.getCurrentContext()B
     at com.sun.javacard.impl.NativeMethods.getCurrentContext(Native Method)
     at com.sun.javacard.impl.PrivAccess.getCurrentAppID(PrivAccess.java:454)
     at javacard.framework.CardException.<init>(CardException.java:46)
     at javacard.framework.UserException.<init>(UserException.java:49)
     at com.sun.javacard.javax.smartcard.rmiclient.CardObjectFactory.throwIt(Unknown Source)
     at com.sun.javacard.javax.smartcard.rmiclient.CardObjectFactory.throwException(Unknown Source)
     at com.sun.javacard.javax.smartcard.rmiclient.CardObjectFactory.getObject(Unknown Source)
     at com.sun.javacard.rmiclientlib.JCRemoteRefImpl.parseAPDU(Unknown Source)
     at com.sun.javacard.rmiclientlib.JCRemoteRefImpl.invoke(Unknown Source)
     at card.PurseImpl_Stub.setAccountNumber(Unknown Source)
     at client.PurseClient.main(PurseClient.java:88)The client aplication from the demo works fine, but at the end it was supposed to generate a UserException. The result that I get is this:
Receiving initial reference... OK
Getting the balance... Balance = 0
Crediting 20...
Debiting 15...
Getting the new balance... Balance = 5
Setting account number equal to 54321...
Getting the account number... 5 4 3 2 1
Trying to set incorrect (too long) account number. Expecting to get UserException with code=0x6002
Exception in thread "main" java.lang.UnsatisfiedLinkError: com.sun.javacard.impl.NativeMethods.getCurrentContext()B
     at com.sun.javacard.impl.NativeMethods.getCurrentContext(Native Method)
     at com.sun.javacard.impl.PrivAccess.getCurrentAppID(PrivAccess.java:454)
     at javacard.framework.CardException.<init>(CardException.java:46)
     at javacard.framework.UserException.<init>(UserException.java:49)
     at com.sun.javacard.javax.smartcard.rmiclient.CardObjectFactory.throwIt(Unknown Source)
     at com.sun.javacard.javax.smartcard.rmiclient.CardObjectFactory.throwException(Unknown Source)
     at com.sun.javacard.javax.smartcard.rmiclient.CardObjectFactory.getObject(Unknown Source)
     at com.sun.javacard.rmiclientlib.JCRemoteRefImpl.parseAPDU(Unknown Source)
     at com.sun.javacard.rmiclientlib.JCRemoteRefImpl.invoke(Unknown Source)
     at card.PurseImpl_Stub.setAccountNumber(Unknown Source)
     at client.PurseClient.main(PurseClient.java:88) Have anybody had this problem when running the RMI demo from the development kit?
Edited by: Traveller83 on Feb 19, 2009 3:11 PM
Update: I'm using JDK 1.6 and I already have tried 1.5, and still have this problem. Also, I get this problem by running either CREF and JCWDE.
It seems that when the runtime environment calls getCurrentContext() from the NativeMethods class it gives an error. The application runs well, and this only happens when a UserException is thrown by the card. All the samples in the javacard kit 2.2.2 gives this problem when the card throws an UserException. Please I need help on this problem, I can't find a solution anywhere...
Thanks in advance.
Edited by: Traveller83 on Feb 19, 2009 11:27 PM

Problem resolved.
I'm using Eclipse for the development of JavaCard applets and the host side. So, i had all the librabries from the JavaCard Kit all along in the same project. When the client application tried to catch an exception thrown by the card some conflicts surged.
To fix this,if you're using Eclipse for the development, you have to separate the necessary libraries for the card from those necessary for the host applications. Now I have two projects, one for the client applications and another for the card side.

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It may be a Problem of Catching the Echoes back from the Processes...I have a Program which Captures the Echoes..see if it works
import java.beans.PropertyChangeEvent;import java.beans.PropertyChangeListener;import java.beans.PropertyChangeSupport;import java.lang.ref.WeakReference;/** * Implements a proxy property change listener using a weak reference to avoid memory locking that would occur if it * was a strong reference. To understand this, we hve to understand that the property change listeners themselves are * hilding onto panels and other objects with strong java references. If the panel goes away while we are viewing an * object, we have a circular emory hold situation where the panel cant be collected because it has ahold of the * property and the property cannot because it has ahold of the pane. If we use weak references instead, then the hard * link between the listener and the producer is softened to almost nothing. */public class WeakPropertyChangeListener implements PropertyChangeListener { /**   * A poperty change support object is included here so that the listener can remove   * himself from the listeners if the reference internally goes to null.   */ private PropertyChangeSupport pcs = null; /** Holds the weak reference to the real listener. */ private WeakReference weakRef = null; /**   * Constructs a new Proxy object for the given support and listener.   * @param pcs The property change support that this object will be using.   * @param pcl The real listener.   */ public WeakPropertyChangeListener(PropertyChangeSupport pcs, PropertyChangeListener pcl) {    if (pcs == null) throw new NullPointerException("pcs");    if (pcl == null) throw new NullPointerException("pcl");    this.pcs = pcs;    weakRef = new WeakReference(pcl); } /** @see <{PropertyChangeListener}> */ public void propertyChange(PropertyChangeEvent changeEvent) {    Object referrant = weakRef.get();    if (referrant == null) {      pcs.removePropertyChangeListener(this);    } else {      ((PropertyChangeListener)referrant).propertyChange(changeEvent);    } } /** Returns true for comparison to referrant or this. */ public boolean equals(Object obj) {    if (obj instanceof WeakPropertyChangeListener) return super.equals(obj);    else if (obj != null)return obj.equals(weakRef.get());    else return false; }}// snipet public void addPropertyChangeListener(PropertyChangeListener listener) {    this.propertyChangeSupport.addPropertyChangeListener(      new WeakPropertyChangeListener(this.propertyChangeSupport, listener)); } public void removePropertyChangeListener(PropertyChangeListener listener) {    this.propertyChangeSupport.removePropertyChangeListener(listener); }

A small problem in DES

I am a beginner to write an encrypt program
I write a simple program to choose a file and use DES to encrypt.
It can' t decrypt
I don't know why
The following is my program
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.filechooser.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.security.*;
import java.security.spec.*;
import java.util.*;
public class encrypt_test extends JFrame
private File openfile;
private KeyGenerator kg;
private SecretKey secretKey,secretKey2;
private Cipher desCipher;
public encrypt_test()
super("encrypt_homework");
Container c = getContentPane();
final JTextArea readmearea = new JTextArea(15,30);
readmearea.setEditable(false);
JScrollPane scroll = new JScrollPane(readmearea);
JPanel buttonpanel = new JPanel();
JButton open = new JButton("Open");
final JFileChooser fc = new JFileChooser();
open.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent evt)
     int n = fc.showOpenDialog(encrypt_test.this);
     if( n == JFileChooser.APPROVE_OPTION)
     openfile = fc.getSelectedFile();
     readmearea.append("OpenFileis: "+openfile.getName()+"\n");
     else
     eadmearea.append("To cancel open file");
buttonpanel.add(open);
JButton encrypt = new JButton("Encrypt");
encrypt.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent evt)
     try
     kg = KeyGenerator.getInstance("DES");
     secretKey = kg.generateKey();
     secretKey2 = secretKey;
     desCipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
     desCipher.init(Cipher.ENCRYPT_MODE, secretKey);
     FileOutputStream fos = new FileOutputStream(openfile);
     BufferedOutputStream bos = new BufferedOutputStream(fos);
     CipherOutputStream cos = new CipherOutputStream(bos,desCipher);
     ObjectOutputStream oos = new ObjectOutputStream(cos);
     oos.writeObject(openfile);
     oos.flush();
     oos.close();
     readmearea.append("Encrypt Success"+"\n");
     catch(NoSuchAlgorithmException e)
     System.err.println("Invalid algorithm: " + e);
     catch(NoSuchPaddingException e)
     System.err.println("Padding problem: " + e);
     catch(InvalidKeyException e)
     System.err.println("Invalid key: " + e);
     catch(IOException e)
     System.err.println("I/O Problem: " + e);
buttonpanel.add(encrypt);
JButton decrypt = new JButton("Decrypt");
decrypt.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent evt)
     try
     desCipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
     desCipher.init(Cipher.DECRYPT_MODE, secretKey2);
     FileOutputStream fos = new FileOutputStream(openfile);
     BufferedOutputStream bos = new BufferedOutputStream(fos);
     CipherOutputStream cos = new CipherOutputStream(bos,desCipher);
     ObjectOutputStream oos = new ObjectOutputStream(cos);
     oos.writeObject(openfile);
     oos.flush();
     oos.close();
     readmearea.append("Decrypt Success"+"\n");
     catch(NoSuchAlgorithmException e)
     System.err.println("Invalid algorithm: " + e);
     catch(NoSuchPaddingException e)
     System.err.println("Padding problem: " + e);
     catch(InvalidKeyException e)
     System.err.println("Invalid key: " + e);
     catch(IOException e)
     System.err.println("I/O Problem: " + e);
buttonpanel.add(decrypt);
c.add(scroll,BorderLayout.CENTER);
c.add(buttonpanel,BorderLayout.SOUTH);
public static void main(String[] args )
encrypt_test app = new encrypt_test();
app.addWindowListener(new WindowAdapter()
public void windowClosing(WindowEvent evt)
System.exit(0);
app.setSize(300,200);
app.setVisible(true);
}

this is my decrypt body
the result is that plaintext is null
I don't know why
desCipher2 = Cipher.getInstance("DES/ECB/PKCS5Padding");
desCipher2.init(Cipher.DECRYPT_MODE,key2);
FileInputStream in = new FileInputStream(openfile);
File testfile = new File("test100.txt");
FileOutputStream fileout = new FileOutputStream(testfile);
CipherOutputStream out = new CipherOutputStream(fileout,desCipher2);
ObjectOutputStream oos = new ObjectOutputStream(out);
byte[] buffer = new byte[kBufferSize];
int length;
while((length = in.read(buffer)) != -1)
oos.write(buffer,0,length);
oos.flush();
in.close();
oos.close();

Problem inputting a SecretKey object into a KeyStore

i am having some problem storing my secretkey object in a key store, i keep getting the error shown below
cannot resolve symbol - class SecretKeyEntry.
the whole class is shown below. i have tried to import the SecretKeyEntry class but i still get an error. can anybody help.
import java.io.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.security.*;
import java.security.KeyStore.*;
//import java.security.KeyStore.SecretKeyEntry;
import java.security.spec.*;
import java.util.*;
public class Encrypt {
public static void main(String args[]) {
File desFile = new File("Saving a text document as an image file.doc");
// Create data to encrypt
Map map = new TreeMap(System.getProperties());
int number = map.size();
try {
// Create Key
KeyGenerator kg = KeyGenerator.getInstance("DES");
SecretKey secretKey = kg.generateKey();
// key store code start
KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
char[] password = {'f','r','a','n','k'};
System.out.println("my password" + password.toString());
ks.load(null, password);
// save my secret key
KeyStore.SecretKeyEntry skEntry = new KeyStore.SecretKeyEntry(mySecretKey);
ks.setEntry("secretKeyAlias", skEntry, password);
//keystore code end
// Create Cipher
Cipher desCipher =
Cipher.getInstance("DES/ECB/PKCS5Padding");
desCipher.init(Cipher.ENCRYPT_MODE, secretKey);
// Create stream
FileOutputStream fos = new FileOutputStream(desFile);
BufferedOutputStream bos = new BufferedOutputStream(fos);
CipherOutputStream cos = new CipherOutputStream(bos,
desCipher);
ObjectOutputStream oos = new ObjectOutputStream(cos);
// Write objects
oos.writeObject(map);
oos.writeInt(number);
oos.flush();
oos.close();
} catch (NoSuchPaddingException e) {
System.err.println("Padding problem: " + e);
} catch (NoSuchAlgorithmException e) {
System.err.println("Invalid algorithm: " + e);
} catch (InvalidKeyException e) {
System.err.println("Invalid key: " + e);
} catch (KeyStoreException e) {
System.err.println("Problem getting Keystore instance" + e);
} catch (IOException e) {
System.err.println("I/O Problem: " + e);
} catch (Exception e) {
System.err.println("All other exceptions" + e);
} finally {
if (desFile.exists()) {
//desFile.delete();
}

You need to change your setEntry() line to this:ks.setEntry("secretKeyAlias", skEntry, new KeyStore.PasswordProtection(password));You also need to insure that you're running under 1.5 - this API didn't exist before that. If you're picking up a 1.4 JVM/libs, it would explain your compilation error.
Grant

FPGA module unzip problem

I downloaded the FPGA module into a controler of a PXI, running XP. When I tried to unzip it, the upzip operation would fail everytime. What is causing this? Is there some kind of requirement to unzip this? Harddrive size requirement?
Kudos and Accepted as Solution are welcome!
Solved!
Go to Solution.

Thanks for helping. I found out what was the problem. I downloaded the FPGA module through the link below. When I tried to unzip it, I would use the default path. Apparently, the default path has a space at the end of its 2nd folder, counting from the end of the path. This is a small bug from NI, but it needs to be fixed. It is a hard problem to catch, since I didn't expect something like that to happen.
https://lumen.ni.com/nicif/us/evallvuser/content.xhtml
Kudos and Accepted as Solution are welcome!

Problem in catching UserException

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