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@ WebServlet ("/ LoginAction")
public class LoginAction extends HttpServlet {
    protected void doGet (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {}

    protected void doPost (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        HttpSession session = request.getSession ();

        String login = request.getParameter ("emp_id");
        String password = request.getParameter ("emp_pass");
        List<Bean>bean = Login.search (login, password);← An error occurs here
        request.setAttribute ("bean", bean);
        RequestDispatcher dispatcher =
                request.getRequestDispatcher ("index.jsp");
        dispatcher.forward (request, response);
public static List<Bean>search (String empId, String empPass) throws Exception {
        Connection connection = null;
        PreparedStatement preparedStatement = null;
        ResultSet resultSet = null;
        Bean bean = null;
        List<Bean>beanList = new ArrayList<>();
        try {
            connection = DBManager.getConnection ();
            String sql = "SELECT * FROM employee WHERE emp_id =? AND emp_pass =?";
            preparedStatement = connection.prepareStatement (sql);
            preparedStatement.setString (1, empId);
            preparedStatement.setString (2, empPass);
            resultSet = preparedStatement.executeQuery ();
            while (resultSet.next ()) {
                Bean empBean = new Bean ();
                empBean.setEmpId (resultSet.getString ("emp_id"));
                empBean.setEmpName (resultSet.getString ("emp_name"));
                empBean.setEmpPass (resultSet.getString ("emp_pass"));
                beanList.add (empBean);
            }
        } catch (Exception e) {
            e.printStackTrace ();
        } finally {
            DBManager.close (resultSet);
            DBManager.close (preparedStatement);
            DBManager.close (connection);
        }
        return beanList;
    }
}

`` `###

Management system using Servlet, DAO, DB and JSP
I make it with Eclipse.
I want to create a screen where I can log in with the ID and PASSWORD stored in the DB.
I want to use a session at that time.

I referred to various websites, but I can't make them.

If i have any advice, thank you