title: Java error in my code Exception in thread "AWT-EventQueue-0"
body: <p>I am building a Student Manager and learned everything from YouTube. Now I am stuck in this. The code is given below and the error is given below too.</p>
  
  <p>This is code:</p>
  
  <pre><code>public class RegisterStart extends JFrame {
  
  private JPanel contentPane;
  private static JTextField uid, fname, lname, sa;
  private static JPasswordField pass;
  private static JComboBox sq;
  
  private static Connection Conn;
  private static ResultSet Rs;
  static Properties prop;
  static InputStream input;
  
  /**
   * Launch the application.
   */
  public static void main(String[] args) {
      EventQueue.invokeLater(new Runnable() {
          public void run() {
              try 
              {
                  RegisterStart frame = new RegisterStart();
                  frame.setVisible(true);
                  Randomize();
  
                  input = new FileInputStream("/Users/rajat/Programming/EclipseJava/Student Manager/src/config.properties");
                  prop.load(input);
  
                  DriverManager.registerDriver(new com.mysql.cj.jdbc.Driver());
                  Conn = DriverManager.getConnection(prop.getProperty("database"), prop.getProperty("dbuser"), prop.getProperty("dbpassword"));
                  Randomize();
              } 
              catch (Exception e) 
              {
                  e.printStackTrace();
              }
          }
      });
  }
  
  
  public RegisterStart() {
      setResizable(false);
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      setBounds(100, 100, 600, 440);
      contentPane = new JPanel();
      contentPane.setBackground(new Color(255, 204, 153));
      contentPane.setBorder(null);
      contentPane.setLayout(new BorderLayout(0, 0));
      setContentPane(contentPane);
  
      JPanel panel = new JPanel();
      panel.setBorder(new EmptyBorder(20, 0, 0, 0));
      panel.setBackground(new Color(255, 204, 153));
      contentPane.add(panel, BorderLayout.NORTH);
  
      JLabel lblAdminRegistration = new JLabel("ADMIN REGISTRATION");
      lblAdminRegistration.setFont(new Font("Lucida Grande", Font.PLAIN, 20));
      lblAdminRegistration.setBackground(new Color(255, 204, 153));
      panel.add(lblAdminRegistration);
  
      JPanel panel_1 = new JPanel();
      panel_1.setBackground(new Color(255, 204, 153));
      contentPane.add(panel_1, BorderLayout.CENTER);
      panel_1.setLayout(null);
  
      JLabel lblNewLabel = new JLabel("USER ID                          :");
      lblNewLabel.setBounds(62, 45, 180, 16);
      panel_1.add(lblNewLabel);
  
      JLabel lblNewLabel_1 = new JLabel("FIRST NAME                    :");
      lblNewLabel_1.setBounds(62, 83, 180, 16);
      panel_1.add(lblNewLabel_1);
  
      JLabel lblNewLabel_2 = new JLabel("LAST NAME                     :");
      lblNewLabel_2.setBounds(62, 122, 180, 16);
      panel_1.add(lblNewLabel_2);
  
      JLabel lblPassworf = new JLabel("PASSWORD                      :");
      lblPassworf.setBounds(62, 164, 180, 16);
      panel_1.add(lblPassworf);
  
      JLabel lblSecurityQuestions = new JLabel("SECURITY QUESTION        :  ");
      lblSecurityQuestions.setBounds(62, 207, 180, 16);
      panel_1.add(lblSecurityQuestions);
  
      uid = new JTextField();
      uid.setHorizontalAlignment(SwingConstants.CENTER);
      uid.setBackground(Color.WHITE);
      uid.setEditable(false);
      uid.setBounds(249, 40, 278, 26);
      panel_1.add(uid);
      uid.setColumns(10);
  
      fname = new JTextField();
      fname.setBounds(249, 78, 278, 26);
      panel_1.add(fname);
      fname.setColumns(10);
  
      lname = new JTextField();
      lname.setBounds(249, 117, 278, 26);
      panel_1.add(lname);
      lname.setColumns(10);
  
      sa = new JTextField();
      sa.setBounds(249, 246, 278, 26);
      panel_1.add(sa);
      sa.setColumns(10);
  
      JLabel lblSecurityAnswer = new JLabel("SECURITY ANSWER            :  ");
      lblSecurityAnswer.setBounds(62, 251, 180, 16);
      panel_1.add(lblSecurityAnswer);
  
      sq = new JComboBox();
      sq.setModel(new DefaultComboBoxModel(new String[] {"Which is your favorite animal?", "Who is your favorite Actor or Actress?", "Who is your first childhood friend?", "What is your hobby?", "Which is your dream Bike/Car?"}));
      sq.setBounds(249, 203, 283, 27);
      panel_1.add(sq);
  
      JButton regbutt = new JButton("REGISTER");
      regbutt.addActionListener(new ActionListener() {
          public void actionPerformed(ActionEvent e) {
              Register();
          }
      });
      regbutt.setBounds(257, 300, 117, 29);
      panel_1.add(regbutt);
  
      pass = new JPasswordField();
      pass.setBounds(254, 159, 273, 26);
      panel_1.add(pass);
  }
  
  private static void Randomize ()
  {
      Random r = new Random (); 
      int a =  r.nextInt(1000000+1);
      uid.setText(a+"");  
  }
  
  private static void Register ()
  {
      char[] pswrd = pass.getPassword();
      String pass2 = String.valueOf(pswrd);
      Calendar cal1 = new GregorianCalendar();
  
      java.util.Date CurrDate = cal1.getTime();
      cal1.setTime(CurrDate);
      cal1.add(Calendar.MONTH, 1);
  
      java.sql.Date SqlDate3 = new java.sql.Date(CurrDate.getTime());
      SimpleDateFormat DMY = new SimpleDateFormat("yyyy-mm-dd");
      DMY.format(SqlDate3);
  
      try 
      {
          int x=0;
          System.out.println(x++);
          PreparedStatement ps = Conn.prepareStatement("insert into admin_database values (?,?,?,?,?,?,?)");
          System.out.println(x++);
          ps.setInt(1, Integer.parseInt(uid.getText()));
          System.out.println(x++);
          ps.setString(2, fname.getText());
          System.out.println(x++);
          ps.setString(3, lname.getText());
          System.out.println(x++);
          ps.setString(4, pswrd.toString());
          System.out.println(x++);
          ps.setString(5, sq.getSelectedItem().toString());
          System.out.println(x++);
          ps.setString(6, sa.getText());
          System.out.println(x++);
          ps.setDate(7, SqlDate3);
          System.out.println(x++);
  
          int i = ps.executeUpdate();
          JOptionPane.showMessageDialog(null, "Thanks for Registering your UserID is "+uid.getText());
      } 
      catch (SQLException e) 
      {
          e.printStackTrace();
      }
  }
  }
  </code></pre>
  
  <p>This is the error I am getting:</p>
  
  <blockquote>
    <p>java.lang.NullPointerException    at
    frames.RegisterStart$1.run(RegisterStart.java:58)     at
    java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
      at
    java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770)
      at java.desktop/java.awt.EventQueue.access$600(EventQueue.java:97)
      at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)  at
    java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)   at
    java.base/java.security.AccessController.doPrivileged(Native Method)
      at
    java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
      at
    java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740)
      at
    java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
      at
    java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
      at
    java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
      at
    java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
      at
    java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
      at
    java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
    0Exception in thread "AWT-EventQueue-0" 
    java.lang.NullPointerException    at
    frames.RegisterStart.Register(RegisterStart.java:190)     at
    frames.RegisterStart.access$2(RegisterStart.java:171)     at
    frames.RegisterStart$2.actionPerformed(RegisterStart.java:153)    at
    java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1967)
      at
    java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2308)
      at
    java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:405)
      at
    java.desktop/javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:262)
      at
    java.desktop/javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:270)
      at
    java.desktop/java.awt.Component.processMouseEvent(Component.java:6589)
      at
    java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3342)
      at java.desktop/java.awt.Component.processEvent(Component.java:6354)
      at java.desktop/java.awt.Container.processEvent(Container.java:2261)
      at
    java.desktop/java.awt.Component.dispatchEventImpl(Component.java:4966)
      at
    java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2319)
      at java.desktop/java.awt.Component.dispatchEvent(Component.java:4798)
      at
    java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4914)
      at
    java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4543)
      at
    java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4484)
      at
    java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2305)
      at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2772)
      at java.desktop/java.awt.Component.dispatchEvent(Component.java:4798)
      at
    java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:772)
      at java.desktop/java.awt.EventQueue.access$600(EventQueue.java:97)
      at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)  at
    java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)   at
    java.base/java.security.AccessController.doPrivileged(Native Method)
      at
    java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
      at
    java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:97)
      at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:745)  at
    java.desktop/java.awt.EventQueue$5.run(EventQueue.java:743)   at
    java.base/java.security.AccessController.doPrivileged(Native Method)
      at
    java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
      at
    java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742)
      at
    java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
      at
    java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
      at
    java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
      at
    java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
      at
    java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
      at
    java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
    2018-08-15 22:28:31.367 java[699:58449] Lookup: Unhandled exception
    'JavaNativeException' caught in +[LULookupDefinitionModule
    _focusTermUsingQueue:handler:]</p>
  </blockquote>