javascript - jQuery ajax call not falling into success -


i new doing jquery ajax calls , trying test ajax call have attempted write today. here is.

var heartbeatinterval = 30000; var heartbeattimer = null; var retrycount = 0; var maxretries = 10;  $().ready(function () {      var url = $.url("/pollbulletin.htm");     heartbeattimer = setinterval(function () {         $.ajax({             url: url,             type: 'get',             error: function (data) {                  retrycount = retrycount + 1;                 if (heartbeattimer != null && retrycount >= maxretries) {                     clearinterval(heartbeattimer);                 }             },             success: function (bulletinbarmessage) {                  retrycount = 0;                 var respcontent = "";                 respcontent += bulletinbarmessage.messagelevel + " : ";                 respcontent += bulletinbarmessage.message;             }         });         // when communication server lost stop heartbeat.     }, heartbeatinterval); });

at moment code never falling success part of call. can confirm if looks ok? i'm not sure if have coded right. know server side code doing write thing. @ moment return null (server side).

server side...

public bulletinbarmessage getbulletinbarmessage() {     jdbctemplate select = this.getjdbctemplate();     list<bulletinbarmessage> messages = select.query(bulletin_lookup_sql, new bulletinbarmessagerowmapper());     bulletinbarmessage bulletinbarmessage = null;      if (messages != null && !messages.isempty()){         bulletinbarmessage = (bulletinbarmessage)messages.get(0);     }      return bulletinbarmessage; }


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