padding problem with AES(help)

[smart mody]

hello

i had problem with this code when i decrypt the text

    import java.security.*;
   import javax.crypto.*;
   import javax.crypto.spec.*;
   import java.io.*;
   
   import java.awt.event.*;
   import javax.swing.*;
   import java.awt.*;


   public class AES extends JFrame {
     
      JTextArea jtfEncrypt,jtfDecrypt;
   JButton Encrypt,Decrypt,clear,exit;
   
   
   private class ClickListener implements ActionListener
      {
         public void actionPerformed(ActionEvent e) 
       {
         if (e.getSource() == Encrypt)               
         {
         try {
            Enc();
         }
         catch (Exception ex) {
            ex.printStackTrace();
         }
            /////////////
          }
          else if (e.getSource() == Decrypt)               
         {     
         try {
            Dec();
         }
         catch (Exception ex) {
            ex.printStackTrace();
         }
         
          }
          else if (e.getSource() == clear)               
         {               
          	Clr();
          }
          else if (e.getSource() == exit)               
         {               
          System.exit(0);
          }
         }
     }
       
       
       
   private class Closer implements WindowListener
    {
       public void windowClosing(WindowEvent e)
       {
          /////////
       }
       public void windowActivated(WindowEvent e) {}
       public void windowClosed(WindowEvent e) {}
       public void windowDeactivated(WindowEvent e) {}
       public void windowDeiconified(WindowEvent e) {}
       public void windowIconified(WindowEvent e) {}
       public void windowOpened(WindowEvent e) {}
   
   }
   
     
   public AES()
   {
      jtfEncrypt=new JTextArea();
      jtfDecrypt=new JTextArea();
      Encrypt=new JButton("Encrypt");
      Decrypt=new JButton("Decrypt");
      clear=new JButton("clear");
      exit=new JButton("exit");
     
     
      JPanel panel =new JPanel();
      panel= (JPanel) getContentPane();
     
      panel.setLayout(new GridLayout(3,1));
     
      panel.add(jtfEncrypt);
      panel.add(Encrypt);
      panel.add(jtfDecrypt);
      panel.add(Decrypt);
      panel.add(clear);
      panel.add(exit);
     
     
      this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      this.setTitle("AES ...");
      this.setResizable(false);
      this.setSize(500,500);
      this.setLocation(350,350);
      this.show();
     
     
            ClickListener cl = new ClickListener();
                 
         Encrypt.addActionListener(cl);
         Decrypt.addActionListener(cl);
         clear.addActionListener(cl);
         exit.addActionListener(cl);

         this.addWindowListener(new Closer());//register Win(Frame)
         
   }
     
     public static String asHex (byte buf[]) {
      StringBuffer strbuf = new StringBuffer(buf.length * 2);
      int i;

      for (i = 0; i < buf.length; i++) {
       if (((int) buf[i] & 0xff) < 0x10)
       strbuf.append("0");

       strbuf.append(Long.toString((int) buf[i] & 0xff, 16));
      }

      return strbuf.toString();
     }

     public static void main(String[] args) throws Exception {
      skeySpec = generateKey();
      new AES();
     }
   
   public static SecretKeySpec generateKey ( ) throws Exception {
       // Get the KeyGenerator
       KeyGenerator kgen = KeyGenerator.getInstance("AES");
       kgen.init(128); // 192 and 256 bits may not be available

       // Generate the secret key specs.
       SecretKey skey = kgen.generateKey();
       byte[] raw = skey.getEncoded();

       SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
       
        return skeySpec ;
   }
   
   public void Enc () throws Exception {
      // Instantiate the cipher
       Cipher cipher = Cipher.getInstance("AES");
       cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
       byte[] encrypted =cipher.doFinal(jtfEncrypt.getText().trim().getBytes());
       jtfDecrypt.setText(asHex(encrypted));
   }
   
   public void Dec () throws Exception {
   	
       Cipher cipher = Cipher.getInstance("AES");
       cipher.init(Cipher.DECRYPT_MODE, skeySpec);
       byte[] decrypted =cipher.doFinal(jtfDecrypt.getText().trim().getBytes());
       jtfEncrypt.setText(asHex(decrypted));
   }
   
   public void Clr () {
   	
   	jtfDecrypt.setText("");
   	jtfEncrypt.setText("");
   }
   
   private static SecretKeySpec skeySpec ;
}   

please i want the solution please