Re: GridBagLayout not beh

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.Insets;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

import net.miginfocom.swing.MigLayout;

public class GBTest extends JFrame {
    private JPanel panel = new JPanel();
    private JLabel userLabel = new JLabel("User:");
    private JLabel passwordLabel = new JLabel("Password:");
    private JLabel dbLabel = new JLabel("Database:");
    private JTextField userTextField = new JTextField(10);
    private JTextField dbTextField = new JTextField(14);
    private JPasswordField passwordField = new JPasswordField(8);
    private JButton dbButton = new JButton("...");

    public GBTest() {
        setLayout(new BorderLayout());
        panel.setLayout(new MigLayout("wrap 4"));

        panel.add(userLabel);
        panel.add(userTextField);
        panel.add(passwordLabel);
        panel.add(passwordField, "span 2");
        panel.add(dbLabel);
        panel.add(dbTextField, "span 3");
        panel.add(dbButton);

        add(panel, BorderLayout.CENTER);

        pack();
        setPreferredSize(new Dimension(400, 250));
        setSize(new Dimension(400, 250));
        setLocationRelativeTo(null);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                new GBTest().setVisible(true);
            }
        });
    }
}