Alimenter JComboBox ERREUR

Bonjour a tous,
Debutant en Java Swing (Visual class de websphere)... quand je rempli le comboBox je reçoi une erreur, mais mon code fonctionne bien. voici le code
Code:
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package day1;
 
import javax.swing.*;
import javax.swing.border.Border;
 
import java.util.*;
import java.sql.*;
 
 
public class Test3 extends JFrame {
 
	private JPanel jContentPane = null;
	//	JComboBox jComboBox = new JComboBox();
	private JComboBox jComboBox = null;
	private JButton jButton = null;
 
	public ArrayList countryTab = new ArrayList();
	public String[] country = new String[136];
 
	private javax.swing.JLabel jLabel = null;
	public static void main(String[] args) {
		Test3 ts = new Test3();
	}
	/**
         * This is the default constructor
         */
	public Test3() {
		super("World");
		initialize();
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
		//getDataCombo();		// set up the combo country
 
		JComboBox jcb = new JComboBox();
		jContentPane.add(jcb);
 
		setVisible(true);
	}
	/**
         * This method initializes this
         * 
         * @return void
         */
	private void initialize() {
		this.setContentPane(getJContentPane());
		this.setSize(548, 349);
		this.setTitle("My Swing");
	}
	/**
         * This method initializes jContentPane
         * 
         * @return javax.swing.JPanel
         */
	private JPanel getJContentPane() {
		if (jContentPane == null) {
			jContentPane = new JPanel();
			jContentPane.setLayout(null);
			jContentPane.add(getJComboBox(), null);
			jContentPane.add(getJButton(), null);
 
			jContentPane.add(getJLabel(), null);
		}
		return jContentPane;
	}
	/**
         * This method initializes jComboBox
         * 
         * @return javax.swing.JComboBox
         */
	private JComboBox getJComboBox() {
 
		getDataCombo(); // set up the combo country
		//JComboBox jComboBox = new JComboBox(country);
			if (jComboBox == null) {
			jComboBox = new JComboBox(country);
 
			jComboBox.setBounds(256, 44, 182, 24);
			jComboBox.addActionListener(new java.awt.event.ActionListener() {
				public void actionPerformed(java.awt.event.ActionEvent e) {
					System.out.println(
						jComboBox.getItemCount()
							+ "/"
							+ jComboBox.getSelectedItem()
							+ "/"
							+ jComboBox.getSelectedIndex());
					String ns = (String) jComboBox.getSelectedItem();
					if (jComboBox.getSelectedItem().equals("Canada")) {
						jButton.setEnabled(false);
						jButton.setText("Ok");
					} else {
						jButton.setEnabled(true);
						jButton.setText("Oui");
					}
				}
			});
			System.out.println("Null");
		}
 
		return jComboBox;
	}
	/**
         * This method initializes jButton
         * 
         * @return javax.swing.JButton
         */
	private JButton getJButton() {
		if (jButton == null) {
			jButton = new JButton();
			jButton.setBounds(446, 10, 69, 58);
			jButton.setText("Go");
			jButton.setIcon(
				new ImageIcon(getClass().getResource("/images/pc.gif")));
			jButton.setHorizontalTextPosition(
				javax.swing.SwingConstants.CENTER);
		}
		return jButton;
	}
 
	public void getDataCombo() {
		int i = 0;
		String data = "jdbc:odbc:WorldEnergy";
		try {
			Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
			Connection conn = DriverManager.getConnection(data, "", "");
			Statement st = conn.createStatement();
			ResultSet rec =
				st.executeQuery("SELECT DISTINCT Country " + "FROM Coal  " +
				//"WHERE " + 	"(Country='" + arguments[0] + "') " +
	"ORDER BY Country");
			while (rec.next()) {
				String str = rec.getString(1);
				//country[i] = rec.getString(1);
				country[i] = str;
				countryTab.add(rec);
				i++;
			}
			//	jComboBox = new JComboBox(country);
			st.close();
		} catch (SQLException s) {
			System.out.println(
				"SQL Error: "
					+ s.toString()
					+ " "
					+ s.getErrorCode()
					+ " "
					+ s.getSQLState());
		} catch (Exception e) {
			System.out.println("Error: " + e.toString() + e.getMessage());
		}
	}
 
	/**
         * This method initializes jLabel
         * 
         * @return javax.swing.JLabel
         */
	private JLabel getJLabel() {
		if(jLabel == null) {
			jLabel = new JLabel();
			jLabel.setBounds(405, 12, 36, 22);
			jLabel.setText("");
			jLabel.setIcon(new ImageIcon(getClass().getResource("/images/icon_cry.gif")));
			jLabel.setHorizontalAlignment(SwingConstants.CENTER);
			jLabel.setHorizontalTextPosition(SwingConstants.CENTER);
		}
		return jLabel;
	}
}  //  @jve:visual-info  decl-index=0 visual-constraint="18,8"
et voici ce a quoi ressemble l'erreur sur l'image attachée...