Why XMLEncoder behave like this

Question

following is my code, can someone check this and tell me whats wrong in this, because if use any inner class / outter class as a object for my JComboBox, this will not encode with giving panel.
//===================================================================
package com.ju.pdfpad;
import javax.swing.*;
import java.io.*;
import java.awt.event.*;
import java.beans.XMLEncoder;
import java.beans.XMLDecoder;
public class Test extends JFrame implements Serializable {
  public JComboBox c;
  public JPanel p;
  //============================================================================
  public Test() {
    setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
    p = getJPanel();
    if( p == null ){
      System.out.println( "null" );
      p = new JPanel();
      Object[] data = { new Integer(1), new Integer(2), new Integer(3) }; // if i use this, encoding fine
      //Item[] data = { new Item(1,"a"), new Item(2,"b"), new Item(3,"c") }; //but if i use this, then inner class will not encode
      c = new JComboBox( data );
      p.add( c );
    getContentPane().setLayout( new java.awt.FlowLayout() );
    getContentPane().add( p );
    addWindowListener( new WindowAdapter(){
      public void windowClosing( WindowEvent we ){
        encodePanel();
    pack();
  //============================================================================
public class Item implements java.io.Serializable {
  public int x;
  public String str;
  public Item(){}
  public Item( int x, String str ){
    this.x = x;
    this.str = str;
  public void setX( int x ){
    this.x = x;
  public int getX(){
    return this.x;
  public void setStr(){
    this.str = str;
  public String getStr(){
    return this.str;
  public String toString(){
    return this.str;
  //============================================================================
  private JPanel getJPanel(){
    try{
      XMLDecoder d = new XMLDecoder( new BufferedInputStream(new FileInputStream("panel.xml")) );
      Object pBox = d.readObject();
      if( pBox != null ){
        p = ( JPanel )pBox;
      d.close();
      return p;
    }catch( FileNotFoundException fnfe ){
      fnfe.printStackTrace();
    }catch( NullPointerException npe ){
      npe.printStackTrace();
    }catch( Exception e ){
      e.printStackTrace();
    return null;
  //============================================================================
  private void encodePanel(){
    try{
      XMLEncoder e = new XMLEncoder( new BufferedOutputStream(new FileOutputStream("panel.xml")) );
      e.writeObject( p );
      e.close();
    }catch( FileNotFoundException fnfe ){
      fnfe.printStackTrace();
    }catch( Exception e ){
      e.printStackTrace();
  //============================================================================
  public static void main(String[] args) {
    new Test().setVisible( true );
  //============================================================================
}

Answer 1

Try the following steps,
Sign into your computer and removal of credit card information. Here are the steps:
1) Open iTunes and sign in to the iTunes Store.
2) Select "View My Account" from the Store menu.
3) Enter your password and click the View Account button.
4) Click the Edit Payment Information button.
5) Select "None" as the payment type.
6) Click the Done button at the bottom of the page.
Reset your account password from the following link:
http://iforgot.apple.com
Phase 3:
Download a free content on to get recognized in iTunes.
To ensure your account is functioning, try downloading a free item from the iTunes Store. To do this, navigate to the iTunes Store main page by clicking the Home icon near the upper-left corner of the window. Scroll down and click the "FREE ON iTunes" link near the bottom of the main page, then select an item to download.
After you are able to download the free App try updating the billing information as usual.