Problem mit JFrame

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.Color;

import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JLabel;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class JMenuBarBeispiel implements ActionListener {
     
     JFrame applikation;
     Container container;
     JMenuBar menueLeiste;
     JMenu file;
     JMenu playlist;
     JMenuItem openplaylist;
	 JMenuItem saveplaylist;
     JMenuItem exit;
     JMenuItem checkplaylist;
	 JMenuItem createplaylist;
	 JMenuItem updateplaylist;
     JTextArea textarea;
	 JLabel dj;
	 TextArea displayPlaylist;


	
     
    public JMenuBarBeispiel() {
          applikation = new JFrame("JMenuBar Beispiel");
          container = applikation.getContentPane();
          applikation.setTitle("Jukebox");
		  applikation.setSize(485,550);
		 
		  // Menüleiste erzeugen
          menueLeiste = new JMenuBar();
		           dj = new JLabel(new ImageIcon("dj.gif"));
				   displayPlaylist = new TextArea(8,60);
         
          
          // Menüelemente erzeugen
          file = new JMenu("File");
          playlist = new JMenu("Playlist");
          
          // Untermenüelemente erzeugen
          openplaylist = new JMenuItem("Open Playlist");
          openplaylist.addActionListener(this);

		  saveplaylist = new JMenuItem("Save Playlist");
          saveplaylist.addActionListener(this);

          exit = new JMenuItem("Exit");
          exit.addActionListener(this);

          checkplaylist = new JMenuItem("Check Playlist");
          checkplaylist.addActionListener(this);

		  createplaylist = new JMenuItem("Create Playlist");
          createplaylist.addActionListener(this);

		  updateplaylist = new JMenuItem("Update Playlist");
          updateplaylist.addActionListener(this);
		   
          
          // Menüelemente hinzufügen
          menueLeiste.add(file);
          menueLeiste.add(playlist);
          
          // Untermenüelemente hinzufügen
          file.add(openplaylist);
		  file.add(saveplaylist);
          file.add(exit);

          playlist.add(checkplaylist);
		  playlist.add(createplaylist);
		  playlist.add(updateplaylist);

          // Textfeld erzeugen
          //textarea = new JTextArea();
		  //textarea.setBackground(Color.gray);
		  
          
          applikation.add(menueLeiste, BorderLayout.NORTH);
		  applikation.add(dj);
		  applikation.add(displayPlaylist);
    
          applikation.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          applikation.setVisible(true);
		  applikation.setResizable(false);
     }
     
	

     public void actionPerformed(ActionEvent object) {
        if (object.getSource() == openplaylist){
               System.out.println("öffnen wurde angeklickt");

          }
          if (object.getSource() == exit){
               System.exit(0);
          }

          
          if (object.getSource() == createplaylist){
               new CreatePlaylist();
          }
		  
		  
     }
     
     public static void main(String[] args) {
          new JMenuBarBeispiel();
     }
}

applikation.add(menueLeiste, BorderLayout.NORTH);
applikation.add(dj);
applikation.add(displayPlaylist);

applikation.add(menueLeiste, BorderLayout.NORTH);

applikation.setJMenuBar(menueLeiste);