I get this Error
The HTML form
The Servlet Code
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package SERVLET;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
*
* @author jc
*/
@WebServlet(name = "registrar", urlPatterns = {"/registrar"})
public class registrar extends HttpServlet {
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code>
* methods.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
try (PrintWriter out = response.getWriter()) {
/* TODO output your page here. You may use following sample code. */
out.println("<!DOCTYPE html>");
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet registrar</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Servlet registrar at " + request.getContextPath() + "</h1>");
out.println("</body>");
out.println("</html>");
}
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP <code>GET</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Handles the HTTP <code>POST</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String dni,nombre,apellido,fecha,direccion,distrito;
dni=request.getParameter("txtdni");
nombre=request.getParameter("txtnombre");
apellido=request.getParameter("txtapellido");
fecha=request.getParameter("txtfecha");
direccion=request.getParameter("txtdireccion");
distrito=request.getParameter("txtdistrito");
if (!dni.equalsIgnoreCase("") && !nombre.equalsIgnoreCase("") && !apellido.equalsIgnoreCase("") && !fecha.equalsIgnoreCase("") &&!direccion.equalsIgnoreCase("") && !distrito.equalsIgnoreCase(""))
{
DATOS.datospersona fun=new DATOS.datospersona();
ENTIDAD.ePersona ent=new ENTIDAD.ePersona(dni, nombre, apellido, fecha, direccion, distrito);
if (fun.RegistrarPersona(ent))
{
request.getRequestDispatcher("Hola.jsp");
}
else
{
request.getRequestDispatcher("index.jsp");
}
}
}
/**
* Returns a short description of the servlet.
*
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}THE HTML CODE
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" type="text/css" href="bootstrap/css/bootstrap.css"/>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Registro</title>
</head>
<body>
<div class="container">
<h1 class="center-block">Introduzca los Datos del nuevo Socio</h1>
<form action="registrar" method="post">
<div class="form-group">
Dni <input class="form-control" type="text" name="txtdni"/><br>
</div>
<div class="form-group">
NOMBRE <input class="form-control" type="text" name="txtnombre"/><br>
</div>
<div class="form-group">
APELLIDOS <input class="form-control" type="text" name="txtapellido"/><br>
</div>
<div class="form-group">
Fecha Nacimiento <input class="form-control" type="date" name="txtfecha"/><br>
</div>
<div class="form-group">
Direccion <input class="form-control" type="text" name="txtdireccion"/><br>
</div>
<div class="form-group">
Distrito <select class="form-control" type="text" NAME="txtdistrito" SIZE=1>
<OPTION>SJL</OPTION>
<OPTION >RIMAC</OPTION>
<OPTION >ATE</OPTION>
<OPTION >SANTA ANITA</OPTION>
</SELECT>
</div>
<div class="form-group">
<button class="btn btn-block btn-primary" type="submit" value="aceptar">Registrar</button>
</div>
</form>
</div>
</body>
</html>