Problem in tracing a very simple code

i'm new in java programming and

specially in IntellijIDEA

i have a simple code , a simple form which is having two buttons

public class frmLogin extends SuperClass implements ActionListener   {
    private JTextField txtUsername;
    private JPasswordField txtPassword;
    private JButton btnLogin;
    private JButton btnSign;
    JFrame frame;

    public frmLogin() {

        frame = new JFrame("Login");
        frame.setContentPane(pnlMain);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);

        btnLogin.addActionListener(this);
        btnSign.addActionListener(this);

    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == btnLogin)  {
            RSAHandler rsaHandler = new RSAHandler();  .....

i wanna trace my code but after showing form and clicking on a button , the trace will not continue

the program goes in running mode and its like that i'm not tracing , it runs all instructions without having a pause on breakpoints

i do trace using F7 key , but still i lose trace chain after clicking on a button

where is my mistake?