probelm in submit button in shutdown Timer

hey guys, um working on shutdown timer and when I press on submit button illogical errors to me appear suddenly that's all the code

Code:

package shutdown.timer; import java.io.IOException; import java.text.DateFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.*; import java.util.logging.Level; import java.util.logging.Logger; import javax.swing.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.BorderLayout; import java.awt.FlowLayout; public class model extends JFrame { private boolean con = true; private JComboBox h; private JComboBox m; private JComboBox ap; private JLabel apaa; private JLabel hours; private JLabel minutes; private JRadioButton shutDownradio; private JRadioButton restartradio; private JLabel shutDownLabel; private JLabel resetLabel; private JButton submit; private JButton reset; private JPanel pan1; private JPanel pan2; private JPanel pan3; private Date d1; private Date d; private String[] hh = {"1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12"}; private String[] mm = {"1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "30", "31", "32", "33", "34", "35", "36", "37", "38", "39", "40", "41", "42", "43", "44", "45", "46", "47", "48", "49", "50", "51", "52", "53", "54", "55", "56", "57", "58", "59"}; private String[] apa = {"am", "pm"}; private ButtonGroup bg; public model() { setupGUI(); getTime(); addListeners(); } private void getTime() { try { d = new Date(); DateFormat df = new SimpleDateFormat("h:m a"); df.format(d); String x = (String) h.getSelectedItem() + (String) m.getSelectedItem() + (String) ap.getSelectedItem(); d1 = df.parse(x); System.out.println(d1); } catch (ParseException ex) { ex.getMessage(); } } private void addListeners() { submit.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { con = true; while (con) { if (shutDownradio.isSelected()) { if (d1.equals(d)) { try { Runtime runtime = Runtime.getRuntime(); Process proc = runtime.exec("shutdown.exe -s -t 0"); System.exit(0); } catch (IOException ex) { ex.getMessage(); } } } else if (restartradio.isSelected()) { if (d1.equals(d)) { try { Runtime runtime2 = Runtime.getRuntime(); Process proc = runtime2.exec("restart.exe -s -t 0"); System.exit(0); } catch (IOException ex) { ex.getMessage(); } } } } } }); reset.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { Thread t=new Thread(){ public void run(){ con=false; } }; t.start(); } }); } private void setupGUI() { // Panels pan1 = new JPanel(); pan2 = new JPanel(); pan3 = new JPanel(); // Labels resetLabel = new JLabel("Reset"); shutDownLabel = new JLabel("ShutDown "); hours = new JLabel("Hours"); minutes = new JLabel("Minutes"); apaa = new JLabel("am/pm"); // CheckBoxes shutDownradio = new JRadioButton(); restartradio = new JRadioButton(); bg = new ButtonGroup(); bg.add(shutDownradio); bg.add(restartradio); // Buttons submit = new JButton("Submit"); reset = new JButton("Reset"); // ComboBoxes h = new JComboBox(hh); m = new JComboBox(mm); ap = new JComboBox(apa); ap.setSize(20, 10); h.setSize(20, 10); m.setSize(20, 10); // panels configuration pan1.setLayout(new FlowLayout()); pan1.add(shutDownradio); pan1.add(shutDownLabel); pan1.add(restartradio); pan1.add(resetLabel); // --------------------------------------------------------- pan2.setLayout(new FlowLayout()); pan2.add(hours); pan2.add(h); pan2.add(minutes); pan2.add(m); pan2.add(apaa); pan2.add(ap); // --------------------------------------------------------- pan3.setLayout(new FlowLayout()); pan3.add(submit); pan3.add(reset); // Frame Layout setSize(350, 150); setVisible(true); add(pan2, BorderLayout.BEFORE_FIRST_LINE); add(pan1, BorderLayout.CENTER); add(pan3, BorderLayout.SOUTH); setDefaultCloseOperation(EXIT_ON_CLOSE); } public static void main(String[] args) { new model(); } }