@Temporal(TemporalType.DATE)
    private Date birthDay;

    public Date getBirthDay() {
        return birthDay;
    }

    public void setBirthDay(Date dt) {
        this.birthDay = dt;
    }

            <div class="control-group">
                <form:label cssClass="control-label" path="birthDay">Дата рождения:</form:label>

                <div class="controls">
                    <form:input path="birthDay"/>
                </div>
            </div>

ORA-01400: невозможно вставить NULL в ("EMPLOYEES"."BIRTHDAY")

birthDay	2015-04-01
name	Ivan
patronymic	Ivanovich
sex	M
surName	Ivanov
Исходный код
surName=Ivanov&name=Ivan&patronymic=Ivanovich&birthDay=2015-04-01&sex=M

    @RequestMapping(value = "/add", method = RequestMethod.POST)
    public String addEmployee(@ModelAttribute("employee") Employee employee, BindingResult result) {
        employeeRepository.save(employee);
        return "redirect:/";
    }

    @InitBinder
    public void binder(WebDataBinder binder) {
        binder.registerCustomEditor(Timestamp.class,
                new PropertyEditorSupport() {
                    public void setAsText(String value) {
                        try {
                            Date parsedDate = new SimpleDateFormat("dd.MM.yyyy").parse(value);
                            setValue(new Timestamp(parsedDate.getTime()));
                        } catch (ParseException e) {
                            setValue(null);
                        }
                    }
                });
    }