symfony2.4 ajax call update or set session issues

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PHP

Ajax

session

i have an issue with symfony2 when i use ajax to set session, hope u pro guys can help me.

here is my **controller code:**

//show month event list
    public function indexAction() {
        if ($this->getRequest()->isXmlHttpRequest()) {
            $paging = $this->getRequest()->get("nom");
            $session = $this->getRequest()->getSession();

            if ($paging) {
                //if $paging is set, then that's a click pager ajax event
                //(not 1st time load)
                $year = $paging;
                $session->set('year', $year);
            } else {
                //$paging is null, it's the first time page load
                $year = (new \DateTime())->format("Y");
                $session->set('year', $year);
            }
            $repository = $this
                    ->getDoctrine()
                    ->getManager()
                    ->getRepository('HycAccountBundle:MonthEvent');

            $annuallist = $repository->monthListByYear($year);
            $jsonlist = json_encode($annuallist);
            return new Response($jsonlist);
        }
        
        //this part is to return entity to twig for using after
        $em = $this->getDoctrine()->getManager();
        $allimages = $em->getRepository('HycAccountBundle:TypeImage')
                ->findAll();
        return $this->render('HycAccountBundle:Account:index.html.twig', array('allimages' => $allimages));
    }

here is my **twig code:**

<script type="text/javascript">
        $(function() {
            $(document).ready(function (){
             jQuery.ajax({
                    type: 'GET',
                    cache: false,
                    url: "{{ path('hyc_account_homepage') }}",
                    success: function(data, textStatus, jqXHR) {
                        alert({{app.session.get('year')}});
                        //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                        //!!!!!!!!! here i can get year 2014 !!!!!!!!!!!!!!
                        //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                    },
                    error:function (){
                    alert('error!');
                }
                });
                return false;
            });
        });
    <script>

but when i click pager part, for example, i click year 2013, then ajax call will return a number (data: 'nom=' + num) to controller, but there i reset session value to num normally, but i cant get alert correct session (it's always 2014 as the 1st time) here is the code ajax, almost same as above:

<script type="text/javascript">
       $(document).ready(function(){
           //after paging, reload month
           $('#page-selection').bootpag({
               total: 3000,
               page: 2014,
               maxVisible: 5
            }).on('page', function(event, num){
                jQuery.ajax({
                   type: 'GET',
                   url: "{{ path('hyc_account_homepage') }}",
                   data: 'nom=' + num,
                   success: function(data, textStatus, jqXHR) {
                       //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                       //here is the problem, it's always 2014, not set again !!
                       //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                       alert({{app.session.get('year')}});


                   },
                   error:function (){
                   alert('error!');
               }
               });
               return false;
            });
       });
   </script>

hope u guys help me, thanks in advance, i've tried for almost 1 day and looked for almost all in google but find nothing = =