public Servers() { setLayout(new BorderLayout(0, 0)); tabbedPane = new JTabbedPane(JTabbedPane.TOP); tabbedPane.setBackground(Color.WHITE); this.setBackground(Color.WHITE); add(tabbedPane, BorderLayout.CENTER); ServerList list = new ServerList(this); tabbedPane.addTab("Server List", null, list, null); // tabbedPane.addTab("Server test", null, new Server(), null); list.retriveServerList(); }