NumberFormatException : null

Please help
Im not able to find wheres the problem and how to resolve

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import javax.sql.*;
import java.util.*;
import java.util.regex.*;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.*;
import javax.naming.*;

public class addEmp extends HttpServlet {
@Override
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        PrintWriter out = response.getWriter();
        boolean isMultipart = ServletFileUpload.isMultipartContent(request);
        System.out.println("request: " + request);
       
        int i=0;

if (!isMultipart) {
            System.out.println("File Not Uploaded");
        } else {
            FileItemFactory factory = new DiskFileItemFactory();
            ServletFileUpload upload = new ServletFileUpload(factory);
            List items = null;

try {
                items = upload.parseRequest(request);
                System.out.println("items: " + items);
            } catch (FileUploadException e) {
                e.printStackTrace();
            }
            Iterator itr = items.iterator();
            while (itr.hasNext()) {
                FileItem item = (FileItem) itr.next();
                if (item.isFormField()) {
                    String name = item.getFieldName();
                    System.out.println("name: " + name);
                    String value = item.getString();
                    System.out.println("value: " + value);

}

else {
                    String finalimage[] = new String[3];
                    try {

String itemName = item.getName();
                        Random generator = new Random();
                        int r = Math.abs(generator.nextInt());

String reg = "[.*]";
                        String replacingtext = "";
                        System.out.println("Text before replacing is:-" + itemName);
                        System.out.println("i  is:" + i);
                        Pattern pattern = Pattern.compile(reg);
                        Matcher matcher = pattern.matcher(itemName);
                        StringBuffer buffer = new StringBuffer();

while (matcher.find()) {
                            matcher.appendReplacement(buffer, replacingtext);
                        }
                        int IndexOf = itemName.indexOf(".");
                        String domainName = itemName.substring(IndexOf);
                        System.out.println("domainName: " + domainName);
                        
                        finalimage[i] = buffer.toString() + "_" + r + domainName;

if (i==0)
                        {
                        request.setAttribute("a", finalimage[i]);
                        }
                        else
                        {
                         request.setAttribute("b", finalimage[i]);
                        }

System.out.println("Final Image===" + finalimage[i]);
                        
                        File savedFile = new File("D:/abc/JAVA/WebApplication1/web/images/"+ finalimage[i]);
                        item.write(savedFile);
                        i++;
                        //Thread.sleep( 15000 );

out.println("<html>");
                        out.println("<body>");
                        out.println("<table><tr><td>");
                        out.println("<img src=\"images/" + finalimage + "\">");
                        out.println("</td></tr></table>");
                        out.println((String)request.getAttribute("a"));
                        Connection con = null;

try {
                            System.out.println("itemName::::: " + itemName);
                           
                           InitialContext context = new InitialContext();
                   
                         DataSource dataSource = (javax.sql.DataSource)context.lookup ("java:comp/env/jdbc/gaurav");
            
                            con = dataSource.getConnection();

PreparedStatement ps;

//get user inputs
                                 String name = request.getParameter("name");
                                 String email = request.getParameter("email");
                                 int day = Integer.parseInt(request.getParameter("day"));
                                 int month = Integer.parseInt(request.getParameter("month"));
                                 int year = Integer.parseInt(request.getParameter("year"));
                                 String designation = request.getParameter("designation");
                                 String abilities = request.getParameter("abilities");
                                 int phone1 = Integer.parseInt(request.getParameter("phone1"));
                                 int phone2 = Integer.parseInt(request.getParameter("phone2"));
                                 String address1 = request.getParameter("address1");
                                 String address2 = request.getParameter("address2");
                                 String city = request.getParameter("city");
                                 String state = request.getParameter("state");
                                 int zip = Integer.parseInt(request.getParameter("zip"));
                                 int doj_day = Integer.parseInt(request.getParameter("doj_day"));
                                 int doj_month = Integer.parseInt(request.getParameter("doj_month"));
                                 int doj_year = Integer.parseInt(request.getParameter("doj_year"));

int salary = Integer.parseInt(request.getParameter("salary"));
                                 int pf = Integer.parseInt(request.getParameter("pf"));
                                 int experience = Integer.parseInt(request.getParameter("experience"));
                                 String remarks = request.getParameter("remarks");
                                 int working = Integer.parseInt(request.getParameter("working"));

java.sql.Date date  = new java.sql.Date(year, month, day);
                                java.sql.Date doj_date  = new java.sql.Date(doj_year, doj_month, doj_day);
                            ps = con.prepareStatement("insert into employee (Emp_name,Birth_Date," +
                                    "Designation,Abilities,Phone_No_1, Phone_No_2,Address1,Address2," +
                                    "City,State,Zip_Code,D_O_Joining,Salary,PF,Photo,License,Email," +
                                    "Experience, Working_with_COMPANY,Remarks) values "+
                                    "(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)");
                          ps.setString(1, name);
                          ps.setDate(2, date);
                          ps.setString(3, designation);
                          ps.setString(4, abilities);
                          ps.setInt(5, phone1);
                          ps.setInt(6, phone2);
                          ps.setString(7, address1);
                          ps.setString(8, address2);
                          ps.setString(9, city);
                          ps.setString(10, state);
                          ps.setInt(11, zip);
                          ps.setDate(12, doj_date);
                          ps.setInt(13,salary);
                          ps.setInt(14, pf);
                          ps.setString(15, (String)request.getAttribute("a") );
                          ps.setString(16, (String)request.getAttribute("b"));
                          ps.setString(17, email);
                          ps.setInt(18,experience);
                          ps.setInt(19,working);
                          ps.setString(20, remarks);
                            
                            ps.executeUpdate();
                            System.out.println("Query Executed Successfully++++++++++++++");
                            out.println("image inserted successfully");

out.println("</body>");
                            out.println("</html>");
                        } catch (Exception e) {
                            e.printStackTrace();
                            e.getMessage();
                            
                        } finally {
                            con.close();

}
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }
        }
   }
}

The servlet is to upload 2 files and insert the data in the form.

So what's the problem? What line it is on?

Here's some helpful hints:

Just posting a bunch of code and asking "what's wrong with it?" isn't an effective way to get help on an issue.

Always provide the exact error message, not your paraphrasing of it.

Problem is the exception generated...its on line 115

It seems likely that one of the parameters you think is an integer isn't in fact an integer. If you want more than that you'll have to tell us where the error happens.

Edit: ah, there you go. What's the value of the day parameter?

Basic debugging step #1, what is the value returned by the call to getParameter()? That's something that should be checked long before you post the problem to a forum.

ok i checked....it returns null.

the form has a element with name "day". Then why the problem?

Use a tool such as HttpFox for Firebug to see the HTTP request for the form submission. Is the request parameter there as you expect?

you are right...
I tested using HttpFox, it doesnt return any value...

and if you notice 2 rows below it, then those the images i want to be uploaded. Method turns into GET....thats strange

Ok i found the solution....

Multipart/form is handled dependent on the API one uses. I used Apache's org.apache.commons.fileupload . for it this is the way to go...

request.getParameters() wont work...

if (item.isFormField()) {
                    String pname = item.getFieldName();

if (pname.equals("day"))
				{
					day = Integer.parseInt(item.getString());
				}
				else if (pname.equals("month"))
				{
					month = Integer.parseInt(item.getString());
				}
				else if (pname.equals("year"))
				{
					year = Integer.parseInt(item.getString());
				}
				else if (pname.equals("doj_day"))
				{
					doj_day = Integer.parseInt(item.getString());
				}
				else if (pname.equals("doj_month"))
				{
					doj_month = Integer.parseInt(item.getString());
				}
				else if (pname.equals("doj_year"))
				{
					doj_year = Integer.parseInt(item.getString());
				}

else if (pname.equals("phone1"))
				{
					phone1 = Integer.parseInt(item.getString());
				}
				else if (pname.equals("phone2"))
				{
					phone2 = Integer.parseInt(item.getString());
				}
				else if (pname.equals("zip"))
				{
					zip = Integer.parseInt(item.getString());
				}
				else if (pname.equals("salary"))
				{
					salary = Integer.parseInt(item.getString());
				}
				else if (pname.equals("experience"))
				{
					experience = Integer.parseInt(item.getString());
				}
				else if (pname.equals("working"))
				{
					working = Integer.parseInt(item.getString());
				}
				else if (pname.equals("pf"))
				{
					pf = Integer.parseInt(item.getString());
				}
				else if (pname.equals("name"))
				{
					name = item.getString();
				}
				else if (pname.equals("email"))
				{
					email = item.getString();
				}
				else if (pname.equals("designation"))
				{
					designation = item.getString();
				}
				else if (pname.equals("abilities"))
				{
					abilities = item.getString();
				}
				else if (pname.equals("state"))
				{
					state = item.getString();
				}
				else if (pname.equals("city"))
				{
					city = item.getString();
				}
				else if (pname.equals("address1"))
				{
					address1 = item.getString();
				}
				else if (pname.equals("address2"))
				{
					address2 = item.getString();
				}
				else if (pname.equals("remarks"))
				{
					remarks = item.getString();
				}