Can't dispose my dialog after moving it using swing timer

[ComputerJy]

Finally got it to work

import java.awt.Frame;
import java.awt.GraphicsEnvironment;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.swing.AbstractAction;
import javax.swing.JDialog;
import javax.swing.SwingUtilities;
import javax.swing.Timer;

public class JDialogNotification extends JDialog {

	private static final long serialVersionUID = 9077763988467568226L;

	private static int getTrayheight() {
		return (Toolkit.getDefaultToolkit().getScreenSize().height - GraphicsEnvironment
				.getLocalGraphicsEnvironment().getMaximumWindowBounds().height);
	}

	public static void main(String args[]) {
		java.awt.EventQueue.invokeLater(new Runnable() {

			public void run() {
				JDialogNotification dialog = new JDialogNotification(
						new javax.swing.JFrame(), true);
				dialog.addWindowListener(new java.awt.event.WindowAdapter() {

					@Override
					public void windowClosing(java.awt.event.WindowEvent e) {
						System.exit(0);
					}
				});
				dialog.setVisible(true);
			}
		});
	}

	public JDialogNotification(Frame owner, boolean modal) {
		super(owner, modal);
		initComponents();
		setWindowLocation();
	}

	// Dialog motion
	private void dialogMotion(final JDialog mainDialog, final int x, final int y) {
		AbstractAction abAction = new AbstractAction() {

			private static final long serialVersionUID = -1005676924292901160L;

			public void actionPerformed(ActionEvent evnt) {
				mainDialog.setLocation(x, y);
			}
		};
		Timer motionTimer = new Timer(300, abAction);
		motionTimer.setRepeats(false);
		motionTimer.start();
	}

	private void initComponents() {

		setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);

		javax.swing.GroupLayout layout = new javax.swing.GroupLayout(
				getContentPane());
		getContentPane().setLayout(layout);
		layout.setHorizontalGroup(layout.createParallelGroup(
				javax.swing.GroupLayout.Alignment.LEADING).addGap(0, 138,
				Short.MAX_VALUE));
		layout.setVerticalGroup(layout.createParallelGroup(
				javax.swing.GroupLayout.Alignment.LEADING).addGap(0, 112,
				Short.MAX_VALUE));

		pack();
	}

	// Set the main window display location
	public void setWindowLocation() {
		try {
			int screenHeight = Toolkit.getDefaultToolkit().getScreenSize().height;
			int screenWidth = Toolkit.getDefaultToolkit().getScreenSize().width;

			int frameHeight = this.getHeight();
			int frameWidth = this.getWidth();

			int _xValue = screenWidth - frameWidth;
			int _yValue = screenHeight - getTrayheight();
			int _yEnd = screenHeight - frameHeight - getTrayheight();

			// this.setLocation((screenWidth - frameWidth), (screenHeight -
			// frameHeight - getTrayheight() - WINDOW_SPACE));
			this.setLocation(_xValue, _yValue);

			while (_yValue > _yEnd) {
				dialogMotion(this, _xValue, _yValue);
				_yValue -= 1;
			}
			Thread.sleep(1000);
			SwingUtilities.invokeLater(new Runnable() {

				public void run() {
					try {
						Thread.sleep(1500);
						System.exit(0);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
			});
		} catch (InterruptedException ex) {
			Logger.getLogger(JDialogNotification.class.getName()).log(
					Level.SEVERE, null, ex);
		}
	}
}