All code

DAOIMPL
    public boolean insertAnswer(Answer answer,User user,Question question) {
        boolean isUpdated = true;
        try
        {
            answer.setUser(user);
            answer.setQuestion(question);
            System.out.println(answer.getUser().getUser_id() + " DAOIMP user id");

            sessionFactory.getCurrentSession().saveOrUpdate(answer);

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

            isUpdated = false;
        }
ServiceImpl
public void insertAnswer(Answer answer,User user,Question question) {
        try {

            answerDao.insertAnswer(answer,user,question);


        } catch (Exception e) {
            e.printStackTrace();
            logger.debug(e.getMessage());
        }
    }
COntroller
    @RequestMapping(value = "QuestionAnswer.htm", method = RequestMethod.POST)
    public ModelAndView postAnswer(HttpServletRequest req, HttpSession session,Answer answer) {
        User objUser = (User) session.getAttribute("user");
        String answerdesc = req.getParameter("answerDesc");
        if(Validator.checkEmpty(answerdesc))
        {
        int qId = Integer.parseInt(req.getParameter("id"));
        Question question=questionService.getQuestionByQId(qId);
        System.out.println(question.getQuesId() + "is question id i ncontroller ");

        answerService.insertAnswer(answer,objUser,question);

        ModelAndView modelAndView = showQuestionAnswer(req);
        req.setAttribute("valuePara", 1);
        return modelAndView;
        }
        else
        {
            ModelAndView modelAndView = showQuestionAnswer(req);
        req.setAttribute("error", "Please post the answer");
            req.setAttribute("valuePara", 1);
            return modelAndView;

        }
    }