Problema com SplashScreen

package controle;

import controle.utils.Utils;
import java.awt.*;
import javax.swing.*;

public class SplashScreen extends JWindow {

    private int duration;

    public SplashScreen(int d) {
        duration = d;
    }

    public void showSplash() {
        JPanel content = (JPanel) getContentPane();
        content.setBackground(Color.white);


        int width = 474;//474

        int height = 370;//200

        Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();
        int x = (screen.width - width) / 2;//2

        int y = (screen.height - height) / 2;//2

        setBounds(x, y, width, height);


        Utils u = new Utils();
        u.getApplicationPath();
        String caminho = u.getApplicationPath() + "/splash_guj.jpg";

        System.out.println(caminho.replace("\", "/"));
        JLabel label = new JLabel(new ImageIcon(caminho));
        JLabel copyrt = new JLabel("JAVA TECNOLOGIA,TODOS OS DIREITOS RESERVADOS", JLabel.CENTER);
        copyrt.setFont(new Font("Sans-Serif", Font.BOLD, 12));
        content.add(label, BorderLayout.CENTER);
        content.add(copyrt, BorderLayout.SOUTH);

        setVisible(true);


        try {
            Thread.sleep(duration);
        } catch (Exception e) {
        }
        setVisible(false);
    }

    public void showSplashAndExit() {
        showSplash();
        System.exit(0);
    }

    @SuppressWarnings("deprecation")
    public static void main(String[] args) {
        SplashScreen splash = new SplashScreen(2000);
        splash.showSplash();

        new menu().setVisible(true);

    }
}

public String getApplicationPath() {
        //u.getApplicationPath());  


        String url = getClass().getResource(getClass().getSimpleName() + ".class").getPath();
        
        File dir = new File(url).getParentFile();
        String path = null;

        if (dir.getPath().contains(".jar")) {
            path = findJarParentPath(dir);
        } else {
            path = dir.getPath();
        }
        try {
            return URLDecoder.decode(path, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            return path.replace("%20", " ");
        }
    }

    private String findJarParentPath(File jarFile) {
        while (jarFile.getPath().contains(".jar")) {
            jarFile = jarFile.getParentFile();
        }
        return jarFile.getPath().substring(6);
    }
}