Will actionListener work in 1.4?

I have the following code written in 1.2.2. It works fine. But when I tried this in 1.4.1, it is not working. This is where the user enter the userid and password and push the "Login" button.
class SISHandler implements ActionListener
public void actionPerformed(ActionEvent e)
if (e.getSource() == JButtonLogin)
String userId=JTextFieldUserName.getText();
String pword=password.getText();
JTextFieldUserName.setText("");
password.setText("");
LoginHandler lh=new LoginHandler();
boolean re=lh.validateUser(userId,pword);
if(re)
          BottomPanel.setVisible(true);
          LoginPanel.setVisible(false);
else
          JOptionPane.showMessageDialog(null, "Please Input correct User Name " + "and Password to login.", "Login error", JOptionPane.ERROR_MESSAGE);
Do anyone know if I have to make any changes to my code to make it work in 1.4.1. Please let me know.
Thanks
James

maybe showMessageDialog won't accept null as an argument?

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