Please help to fix this code. It will not run and has compile errors.

package net.codejava.swing.mail;

import java.awt.Font;

import java.awt.GridBagConstraints;

import java.awt.GridBagLayout;

import java.awt.Insets;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.io.File;

import java.util.Properties;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JMenu;

import javax.swing.JMenuBar;

import javax.swing.JMenuItem;

import javax.swing.JOptionPane;

import javax.swing.JScrollPane;

import javax.swing.JTextArea;

import javax.swing.JTextField;

import javax.swing.SwingUtilities;

import javax.swing.UIManager;

import net.codejava.swing.JFilePicker;

/**

* A Swing application that allows sending e-mail messages from a SMTP server.

* @author www.codejava.net

*

*/

public class SwingEmailSender extends JFrame {

private ConfigUtility configUtil = new ConfigUtility();

private JMenuBar menuBar = new JMenuBar();

private JMenu menuFile = new JMenu("File");

private JMenuItem menuItemSetting = new JMenuItem("Settings..");

private JLabel labelTo = new JLabel("To: ");

private JLabel labelSubject = new JLabel("Subject: ");

private JTextField fieldTo = new JTextField(30);

private JTextField fieldSubject = new JTextField(30);

private JButton buttonSend = new JButton("SEND");

private JFilePicker filePicker = new JFilePicker("Attached", "Attach File...");

private JTextArea textAreaMessage = new JTextArea(10, 30);

private GridBagConstraints constraints = new GridBagConstraints();

public SwingEmailSender() {

super("Swing E-mail Sender Program");

// set up layout

setLayout(new GridBagLayout());

constraints.anchor = GridBagConstraints.WEST;

constraints.insets = new Insets(5, 5, 5, 5);

setupMenu();

setupForm();

pack();

setLocationRelativeTo(null); // center on screen

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

private void setupMenu() {

menuItemSetting.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent event) {

SettingsDialog dialog = new SettingsDialog(SwingEmailSender.this, configUtil);

dialog.setVisible(true);

}

});

menuFile.add(menuItemSetting);

menuBar.add(menuFile);

setJMenuBar(menuBar);

}

private void setupForm() {

constraints.gridx = 0;

constraints.gridy = 0;

add(labelTo, constraints);

constraints.gridx = 1;

constraints.fill = GridBagConstraints.HORIZONTAL;

add(fieldTo, constraints);

constraints.gridx = 0;

constraints.gridy = 1;

add(labelSubject, constraints);

constraints.gridx = 1;

constraints.fill = GridBagConstraints.HORIZONTAL;

add(fieldSubject, constraints);

constraints.gridx = 2;

constraints.gridy = 0;

constraints.gridheight = 2;

constraints.fill = GridBagConstraints.BOTH;

buttonSend.setFont(new Font("Arial", Font.BOLD, 16));

add(buttonSend, constraints);

buttonSend.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent event) {

buttonSendActionPerformed(event);

}

});

constraints.gridx = 0;

constraints.gridy = 2;

constraints.gridheight = 1;

constraints.gridwidth = 3;

filePicker.setMode(JFilePicker.MODE_OPEN);

add(filePicker, constraints);

constraints.gridy = 3;

constraints.weightx = 1.0;

constraints.weighty = 1.0;

add(new JScrollPane(textAreaMessage), constraints);

}

private void buttonSendActionPerformed(ActionEvent event) {

if (!validateFields()) {

return;

}

String toAddress = fieldTo.getText();

String subject = fieldSubject.getText();

String message = textAreaMessage.getText();

File[] attachFiles = null;

if (!filePicker.getSelectedFilePath().equals("")) {

File selectedFile = new File(filePicker.getSelectedFilePath());

attachFiles = new File[] {selectedFile};

}

try {

Properties smtpProperties = configUtil.loadProperties();

EmailUtility.sendEmail(smtpProperties, toAddress, subject, message, attachFiles);

JOptionPane.showMessageDialog(this,

"The e-mail has been sent successfully!");

} catch (Exception ex) {

JOptionPane.showMessageDialog(this,

"Error while sending the e-mail: " + ex.getMessage(),

"Error", JOptionPane.ERROR_MESSAGE);

}

}

private boolean validateFields() {

if (fieldTo.getText().equals("")) {

JOptionPane.showMessageDialog(this,

"Please enter To address!",

"Error", JOptionPane.ERROR_MESSAGE);

fieldTo.requestFocus();

return false;

}

if (fieldSubject.getText().equals("")) {

JOptionPane.showMessageDialog(this,

"Please enter subject!",

"Error", JOptionPane.ERROR_MESSAGE);

fieldSubject.requestFocus();

return false;

}

if (textAreaMessage.getText().equals("")) {

JOptionPane.showMessageDialog(this,

"Please enter message!",

"Error", JOptionPane.ERROR_MESSAGE);

textAreaMessage.requestFocus();

return false;

}

return true;

}

public static void main(String[] args) {

// set look and feel to system dependent

try {

UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());

} catch (Exception ex) {

ex.printStackTrace();

}

SwingUtilities.invokeLater(new Runnable() {

@Override

public void run() {

new SwingEmailSender().setVisible(true);

}

});

}

}