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POLong polling freezes browser and block other ajax request
 

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    <p>I am trying to implement long polling in my <a href="http://static.springsource.org/spring/docs/2.0.x/reference/mvc.html">Spring-MVC Web App</a> but it freezes my browser and other request after 4-5 continues AJAX requests.I have no clue whats goin on here is my relevant code.</p> <p><strong>The controller method:(Server Side):-</strong></p> <pre><code>@Asynchronous @RequestMapping("/notify") public @ResponseBody Events notifyEvent(HttpServletRequest request) { Events events = null; try { events = (Events) request.getSession(false).getServletContext().getAttribute("events"); System.out.println("Request Came from" + ((com.hcdc.coedp.safe.domain.User) request.getSession(false).getAttribute(Constants.KEY_LOGGED_IN_USER)).getLoginId()); if (!events.getTypeOfEvents().isEmpty()) { System.out.println("Removing older entries"); events.getTypeOfEvents().clear(); } while (!events.isHappend()) { //Waiting for event to happen. } events = Events.getInstance(); events.setHappend(false); request.getSession(false).getServletContext().setAttribute("events", events); }catch (Exception e) { e.printStackTrace(); } return events; } </code></pre> <p><strong>The long-polling script(Client Side):-</strong></p> <pre><code>$(document).ready(function() { $.ajaxSetup({ async:true//set a global ajax requests as asynchronus }); alert('Handler for .onload() called.'); waitForMsg(); }); function waitForMsg(){ xhr= $.ajax({ type: "POST", url: '&lt;%=request.getContextPath()%&gt;/notification/notify', async: true, /* If set to non-async, browser shows page as "Loading.."*/ cache: false, timeout:50000, /* Timeout in ms */ global:false, success: function(data){ /* called when request to notifier completes */ /* Doing smthing with response **/ setTimeout( waitForMsg, /* Request next message */ 1000 /* ..after 1 seconds */ ); }, error: function(XMLHttpRequest, textStatus, errorThrown){ addmsg("error", textStatus + " (" + errorThrown + ")"); setTimeout( waitForMsg, /* Try again after.. */ 15000); /* milliseconds (15seconds) */ } }); }; </code></pre> <p><strong>UPDATE:</strong></p> <pre><code>function updateFeed(event, data) { var f=eval(data); alert(f.typeOfEvents.length); } function catchAll(event, data, type) { console.log(data); alert("error"); console.log(type); } $.comet.connect('&lt;%=request.getContextPath()%&gt;/notification/notify'); $(document).bind('feed.comet', updateFeed); $(document).bind('.comet', catchAll); </code></pre> <p>Neither alert box pops up..:(</p>
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    1. COi think you are using setTimeout instead of setInterval. Check [this](http://stackoverflow.com/questions/2696692/setinterval-vs-settimeout)
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    2. COi think its not the problem for freezing it is perfect because i want to call method only once not again and again(on sucess or error).
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    3. CODo you see any problem/error in your firebug. If the data coming from the server is huge, it could freeze the browser.
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