JSP + JSON registration

// SERVLET
package servlets;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;

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

import model.User;
import model.UserRole;

import org.json.JSONException;
import org.json.JSONObject;

import DB.WebShop;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

public class RegisterServlet extends HttpServlet {

    /**
     *
     */
    private static final long serialVersionUID = -1451723899712538224L;

    public RegisterServlet()
    {
        super();
    }

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println("doso na REGSERVLET - GET");
        HttpSession session = request.getSession();
        User user = (User) session.getAttribute("user");

        response.setHeader("Cache-Control", "no-cache, max-age=0, must-revalidate, no-store");

        String refURL = (String) request.getHeader("Referer");
        session.setAttribute("refURL", refURL);

        System.out.println(new Date() + ": GET '/RegisterServlet' SessionID: "+ session.getId());

        if (user == null)
        {
            RequestDispatcher disp = request.getRequestDispatcher("pages/register.jsp");
            disp.forward(request, response);
        }
        else if (refURL != null && !refURL.isEmpty())
        {
            response.sendRedirect(refURL);
        }
        else
        {
            response.sendRedirect(request.getContextPath());
        }
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println("doso na REGSERVLET - POST");

         response.setHeader("Cache-Control", "no-cache, max-age=0, must-revalidate, no-store");
         getServletContext().removeAttribute("data");
         WebShop ws = (WebShop)this.getServletContext().getAttribute("webShop");


         String jsonData = request.getParameter("reg");
            System.out.println("jsonData: " + jsonData);

            ObjectMapper mapper = new ObjectMapper();

            JsonNode rootNode = mapper.readTree(jsonData);

            JsonNode actionNode = rootNode.path("action");
            JSONObject obj = new JSONObject();
            String message = "";
            Boolean err = false;

            System.out.println(actionNode.toString());
            if (actionNode.toString().replace("\"", "").equals("new"))
            {
                JsonNode dataNode = rootNode.path("data");
                User u = mapper.readValue(dataNode.toString(), User.class);
                u.setRole(UserRole.USER.getValue()); // We assume that reg'd user is a normal user..it can be later be promoted by an admin to a mod/admin.

                if (u.getUsername().isEmpty() || u.getEmail().isEmpty() || u.getLastName().isEmpty() || u.getName().isEmpty() || u.getPassword().isEmpty() || u.getPhone().isEmpty())
                {
                    System.out.println("ALL NULL");
                    err = true;
                    try {
                        genErr(response, request, obj, err, "All fields are required. Please try again.");
                    } catch (JSONException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                    return;
                }
                if (ws.getUsers().containsKey(u.getUsername()))
                {
                    err = true;
                    try {
                        genErr(response, request, obj, err, "Account with that username is already registered.<br />Please try again.");
                    } catch (JSONException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                    return;
                }

                if (!err)
                {
                    ws.addUser(u);
                    ws.saveData();

                    System.out.println("user: " + u.toString());
                    System.out.println("All users: " + ws.getUsers().toString());
                }

            }
            else if (actionNode.toString().replace("\"", "").equals("edit"))
            {
                // TODO: fixme
                // For editing user
            }
            else if (actionNode.toString().replace("\"", "").equals("delete"))
            {
                // TODO: fixme
                // Deleting a user
            }

            if (!err)
            {
                try {
                    genErr(response, request, obj, err, "User successfully registered.<br />You will be redirected to the main page in 5 seconds.");
                } catch (JSONException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
    }

    private void genErr(HttpServletResponse response, HttpServletRequest request, JSONObject obj, Boolean b, String m) throws JSONException, IOException
    {
        response.setContentType("application/json");
        obj.put("error", new Boolean(b));
        if (!b)
            obj.put("url", request.getContextPath());
        obj.put("message", m);
        PrintWriter pw = response.getWriter();
        pw.print(obj);
    }
}

// PAGE
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@page pageEncoding="UTF-8" %>
<jsp:include page="header.jsp"/>
<div class="content">
  <div class="container">
    <div class="row">
<script src="//ajax.aspnetcdn.com/ajax/jquery.validate/1.9/jquery.validate.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
    $("#register-form").validate({

        // RuleZ:
        rules: {
            username: {
                required: true,
                minlength: 3
            },
            password: {
                required: true,
                minlength: 6
            },
            confirm_password: {
                required: true,
                minlength: 6,
                equalTo: "#password"
            },
            name: "required",
            lastName: "required",
            email: {
                required: true,
                email: true
            },
            phone: {
                required: true,
                number: true
            },
            cbTos: "required"
        },

        // Validation msg:
        messages: {
            firstname: "Please enter your first name",
            lastname: "Please enter your last name",
            password: {
                required: "Please provide a password",
                minlength: "Your password must be at least 6 characters long"
            },
            confirm_password: {
                required: "Please provide a password",
                minlength: "Your password must be at least 6 characters long",
                equalTo: "Please enter the same password as above"
            },
            email: "Please enter a valid email address",
            phone: "Please enter a valid phone number",
            cbTos: "Please accept our Terms and Conditions"
        },

        // Using submitHandler to preform ajax calls only when form is validated!
        submitHandler: function(form) {
            var objectArray = $("#register-form :input").serializeArray(); // Make an array of input vals
            var data, objectData = {};
            action = 'new', name = null;

            for (var i in objectArray)
            {
                name = objectArray[i].value;
                objectData[objectArray[i].name] = objectArray[i].value;
            };

            // Delete stuff that's not needed for processing
            delete objectData.confirm_password;
            delete objectData.cbTos;

            data = { 'action' : action, 'data' : objectData };
            data =  JSON.stringify(data);
            data = "reg=" + data;

            $.ajax({
                type: "POST",
                url: "<%=request.getContextPath()%>/RegisterServlet",
                data: data,
                dataType: "json"
              }).
                success(function(res){
                    if(res.url != null)
                    {
                        $("#msgBox").modal('show');
                        $("#msg").html(res.message);
                        setTimeout(function() {
                              window.location.href = res.url;
                            }, 5000); // is k, 5sec
                    }

                    if (res.error) {
                        $("#err").html(res.message);
                        if ($("#err").is(":hidden"))
                            $("#err").toggle();

                    }

                }).
                error(function(res) {
                    if (res.error)
                        {
                            $("#err").text(res.message);
                            $("#err").toggle();
                        }
                });
            return false;
        }
    });

    // Let's propose a username for our user when onFocus() event happens...
    $("#username").focus(function()
    {
        var firstname = $("#name").val().toLowerCase();
        var lastname = $("#lastName").val().toLowerCase();

        if (firstname && lastname && !this.value)
        {
            this.value = firstname + "." + lastname;
        }
    });

    $('#register-form input').bind('oninput', function(){

        if ($('#register-form').valid())
            $('#reg_btn1').fadeIn();

    });
});
  </script>
<!-- Register form -->
                <div class="col-md-6">
                  <div class="formy well">
                     <h4 class="title">Register a new account</h4>
                                  <div class="form">
                                    <div id="err" class="alert alert-danger" hidden="true"></div>

                                    <form id="register-form" method="post" class="form-horizontal">

                                           <div class="form-group">
                                            <label class="control-label col-md-3" for="name">Name</label>
                                            <div class="col-md-6">
                                              <input type="text" class="form-control" id="name" name="name" />
                                            </div>
                                          </div>

                                          <div class="form-group">
                                            <label class="control-label col-md-3" for="lastname">Last name</label>
                                            <div class="col-md-6">
                                              <input type="text" class="form-control" id="lastName" name="lastName" />
                                            </div>
                                          </div>

                                             <div class="form-group">
                                            <label class="control-label col-md-3" for="username2">Username</label>
                                            <div class="col-md-6">
                                              <input type="text" class="form-control" id="username" name="username" />
                                            </div>
                                          </div>
                                          <!-- Password -->
                                          <div class="form-group">
                                            <label class="control-label col-md-3" for="password2">Password</label>
                                            <div class="controls col-md-6">
                                              <input type="password" class="form-control" id="password" name="password" />
                                            </div>
                                          </div>

                                            <div class="form-group">
                                            <label class="control-label col-md-3" for="password2">Confirm Password</label>
                                            <div class="controls col-md-6">
                                              <input type="password" class="form-control" id="confirm_password" name="confirm_password" />
                                            </div>
                                          </div>

                                          <div class="form-group">
                                            <label class="control-label col-md-3" for="phone">Phone</label>
                                            <div class="col-md-6">
                                              <input type="text" class="form-control" id="phone" name="phone" />
                                            </div>
                                          </div>

                                          <div class="form-group">
                                            <label class="control-label col-md-3" for="username2">E-mail</label>
                                            <div class="col-md-6">
                                              <input type="text" class="form-control" id="email" name="email" />
                                            </div>
                                          </div>

                                          <div class="form-group">
                                          <div class="col-md-9 col-md-offset-3">
                                             <div class="checkbox inline">
                                                <label>
                                                   <input type="checkbox" id="cbTos" name="cbTos" value="agree"> Agree with our Terms and Conditions
                                                </label>
                                             </div>
                                            </div>
                                          </div>

                                          <!-- Buttons -->
                                          <div class="form-group">
                                             <!-- Buttons -->
                                             <div class="col-md-6 col-md-offset-3">
                                                <button type="submit" id="reg_btn1" class="btn btn-default">Register</button>
                                                <button type="reset" class="btn btn-default">Reset</button>
                                             </div>
                                          </div>
                                      </form>
                                      <hr />
                                      <h5>Hint</h5>
                                           Register so you can fully explore our website.
                                    </div>
                                  </div>

                </div>
       </div>
  </div>
</div>
<div id="msgBox" class="modal fade">
<div class="modal-dialog">
        <div class="modal-content">
  <div class="modal-header">
    <button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
    <h4>Message:</h4>
  </div>
  <div class="modal-body">

    <div id="msg" class="form"></div>

  </div>
  <div class="modal-footer">
    <p id="cntRedirect"><a href="<%=request.getContextPath()%>/Index">Home</a></p>
    Note: Page will redirect automatically in 5 seconds.
  </div>
  </div>
  </div>
</div>

<jsp:include page="footer.jsp"/>