spring form jsp binding reference bean

I was trying to bind POJO using spring form tag library. After binding reference class bean variables, I am getting "Bad Request Error- Http Status 400".

If I remove binding of reference class, My form is submitted successfully and values are also populated inside the class.

public class EmployeeTourPojo {

  private String empDisplayName;

  private List<TourDetailsPojo> tourDetails;

  //getter and setter

}

and

public class TourDetailsPojo {

    private Date departDate;

    private String departTime;

//getters and setters

}

JSP:

<td><form:input path="empDisplayName" class="form-control"/>    </td>

<form:input placeholder="Departure Date" path="tourDetails[${index}].departDate" required="required" class="datepicker form-control"/><br/>

I had got references from few articles but they are loading the list of reference bean at the get request while I am adding the rows before the submitting the JSP.

I found the issue lies in incrementing the index after Clicking "Add Row". Hence, I had added following JQuery code to increment index.

$("#addRow").click(function(){
                    //alert("The button was clicked.");
                    var addressRow = $('.repeat-address').last();
                    var addressRowLength = $('.repeat-address').length;

                    var newAddressRow = addressRow.clone(true).find("input").val("").end(); 

                    $(newAddressRow).find("td input,td select").each(function(index,item) {
                        item.name = item.name.replace(/[0-9]/g,addressRowLength);
                    });

                    newAddressRow.insertAfter(addressRow);


                }); 

HTML CODE

<c:set var="index" value="0"/>
                    <td><form:input path="empDisplayName" class="form-control"/>    </td>
                    <tr class="repeat-address">

                        <td>Departure Date</td>
                        <td><form:input placeholder="Departure Date" path="tourDetails[${index}].departDate" required="required" class="datepicker form-control"/></td>


                        <td>Pincode</td>
                        <td><input type="text" name="tourDetails[${index}].departDate"/></td>
                        <td><input type="file" name="tourDetails[${index}].tourTicket"/></td>
                    </tr>
                    <tr><td colspan="3"><input id="addRow" type="button" value="Add Row"></td></tr>

Since, I also need to bind input type file with POJO. I had also Added one Multipart field (in TourDetailsPojo Bean) as

private Date departDate;

private Multipart tourTicket;

//getters and setters