Untitled

<!DOCTYPE html>
<html>
<head>
</head>
<body>
    <form action="./registration" method="get">
            Name:<input type="text" name="name"><br/>
    Father Name: <input type="text" name="fname"><br/>
    Mother Name: <input type="text" name="mname"><br/>
                 <input type="hidden" name="formd" value="1"/>
                 <input type="submit" value="Next>>>">
    </form>
</body>
</html>

form2.html
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<form action="./registration">
    Contact:<input type="text" name= "contact"><br/>
    Email: <input type= "text" name= "email"><br/>
    Address: <input type ="text" name= "address"><br/>
    <input type="hidden" name= "formd" value="2"/>
    <input type= "submit" value="Next>>>">
</form>
</body>
</html>

form3.html
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<form action="./registration">
    Qualification:<input type="text" name= "qualification"><br/>
    Percentage: <input type ="text" name= "percentage"><br/>
    <input type="hidden" name= "formd" value="3"/>
    <input type= "submit" value="Submit!">
</form>
</body>
</html>

package controller;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class AadharRegistration extends HttpServlet {
    private static final long serialVersionUID = 1L;

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        PrintWriter out = response.getWriter();

        HttpSession httpsession = request.getSession();
        String fno = request.getParameter("formd");

        if (fno.equals("1")) {
            String name = request.getParameter("name");
            String fname = request.getParameter("fname");
            String mname = request.getParameter("mname");

            httpsession.setAttribute("name", name);
            httpsession.setAttribute("fname", fname);
            httpsession.setAttribute("mname", mname);

            response.sendRedirect("./form2.html");
        }

        if (fno.equals("2")) {
            String contact = request.getParameter("contact");
            String email = request.getParameter("email");
            String address = request.getParameter("address");

            httpsession.setAttribute("contact", contact);
            httpsession.setAttribute("email", email);
            httpsession.setAttribute("address", address);

            response.sendRedirect("./form3.html");

        }

        if (fno.equals("3")) {

            String qualification = request.getParameter("qualification");
            String percentage = request.getParameter("percentage");

            String name = (String) httpsession.getAttribute("name");
            String fname = (String) httpsession.getAttribute("fname");
            String mname = (String) httpsession.getAttribute("mname");

            String contact = (String) httpsession.getAttribute("contact");
            String email = (String) httpsession.getAttribute("email");
            String address = (String) httpsession.getAttribute("address");

            try {
                Class.forName("oracle.jdbc.OracleDriver");
                Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:p1aor01", "system",
                        "sysdba");

                PreparedStatement ps = conn.prepareStatement("insert into aadhar values (?,?,?,?,?,?,?,?)");
                ps.setString(1, name);
                ps.setString(2, fname);
                ps.setString(3, mname);
                ps.setString(4, contact);
                ps.setString(5, email);
                ps.setString(6, address);
                ps.setString(7, qualification);
                ps.setString(8, percentage);

                int res = ps.executeUpdate();

                if (res != 0) {
                    out.println("<font color='green'><h1>Registered Successfully!</h1>");
                }

            } catch (SQLException e) {
                out.println("<font color='red'><h1>Registration exception Failed!</h1>");
                e.printStackTrace();
            } catch (ClassNotFoundException xe) {
                xe.printStackTrace();
            }
        }
    }

}

java.lang.NullPointerException
    controller.AadharRegistration.doGet(AadharRegistration.java:26)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)


Note The full stack trace of the root cause is available in the server logs.

From Console in eclipse:
SEVERE: Servlet.service() for servlet [AadharRegistration] in context with path [/TestAadharRegistration] threw exception
java.lang.NullPointerException
    at controller.AadharRegistration.doGet(AadharRegistration.java:26)