Question

When I try to add the data from a form to my DB it gives me an error as

exception

org.apache.jasper.JasperException: java.lang.NumberFormatException:
null
root cause

java.lang.NumberFormatException: null

This is my code

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@page import="java.sql.*" %>
<%@page import="java.util.*"%>
<%@page import="java.io.*" %>
<%
    String firstName = request.getParameter("firstName");
    String secondName = request.getParameter("secondName");
    String gender = request.getParameter("gender");
    String address = request.getParameter("address");
    String city = request.getParameter("city");
    String country = request.getParameter("country");
    int zip = Integer.parseInt(request.getParameter("zip"));
    int mobileNo = Integer.parseInt(request.getParameter("mobileNo"));
    int homePhone = Integer.parseInt(request.getParameter("homePhone"));
    String eMail = request.getParameter("eMail");

    try {
        Class.forName("com.mysql.jdbc.Driver").newInstance();
        Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/testproject", "root", "123456");
        Statement st = null;
        PreparedStatement ps = null;
        ResultSet rs = null;

        ps = con.prepareStatement("INSERT INTO studentregform (firstName, secondName, gender, address, city, country, zip, mobile, homePhone, email) VALUES ( ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)");

        ps.setString(1, firstName);
        ps.setString(2, secondName);
        ps.setString(3, gender);
        ps.setString(4, address);
        ps.setString(5, city);
        ps.setString(6, country);
        ps.setInt(7, zip);
        ps.setInt(8, mobileNo);
        ps.setInt(9, homePhone);
        ps.setString(10, eMail);

        int result = ps.executeUpdate();




    } catch (Exception e) {
        //out.println("Data not inserted");
        throw new Error(e);
    }

%>

Can anyone help me on this? Thank you.

Answer 1

It would seem that one of these 3 lines is giving you the problem;

int zip = Integer.parseInt(request.getParameter("zip"));
int mobileNo = Integer.parseInt(request.getParameter("mobileNo"));
int homePhone = Integer.parseInt(request.getParameter("homePhone"));

Are you sure they’re all entirely numeric? In case one of them is empty, null, unset or has any kind of separators like 1-800-123-4567, it can’t be stored as a number and Integer.ParseInt() will throw a NumberFormatException.

Edit: You say that your phone numbers are 10 digits and entirely numeric. Still, you’re going to have problems since a Java Integer doesn’t have that much precision. In fact, it cannot store any number larger than about 2 billion.