HTTP status 406 - Please HELP!!! Spring+Ajax

[deathfrag]

Hi,

I'm using SpringMVC for my web application. In one of the JSPs I'm making an Ajax call using jQuery and retrieving a list of objects.

my jsp calls

<script type="text/javascript">
function getCities() {
	jq(function() {
		jq.post("getCities.html",
					{ 	stateSelect:  jq("#stateSelect").val()},
						function(data){
							jq("#cities").replaceWith('<span id="cities">Changed</span>');
					});
	});
}
</script>

The getCities is mapped to the following:

@RequestMapping(value = "/getCities", method = RequestMethod.POST)
    public @ResponseBody List<StateNames> getCities(@RequestParam(value="stateSelect", required=true) String stateName,
    							Model model) {
		// Delegate to service to do the actual adding
		List<StateNames> listStates = myService.listCityNames(stateName);
		
		// @ResponseBody will automatically convert the returned value into JSON format
		// You must have Jackson in your classpath
		return listStates;
	}

I get the following error when I run this.

406 Not Acceptable
    The requested resource is only capable of generating content not acceptable according to the Accept headers sent in the request.

Please guide me.
I used Firbug to see what's going on. Here's what i get:

Response Headers
Server	Apache-Coyote/1.1
Content-Type	text/html;charset=utf-8
Content-Length	1070
Date	Sat, 12 Feb 2011 13:09:44 GMT

Request Headers
Host	localhost:8080
User-Agent	Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13
Accept	*/*
Accept-Language	en-us,en;q=0.5
Accept-Encoding	gzip,deflate
Accept-Charset	ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive	115
Connection	keep-alive
Content-Type	application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With	XMLHttpRequest
Referer	http://localhost:8080/MyApplication/
Content-Length	17
Cookie	JSESSIONID=640868A479C40792F8AB3DE118AF12E0
Pragma	no-cache
Cache-Control	no-cache

Please guide me.

[robin]

I suppose you're using the wrong JQuery function since the accept header

Accept: application/json, text/javascript, */*

is missing, use postJSON() instead.

Robin.

[deathfrag]

I suppose you're using the wrong JQuery function since the accept header

Accept: application/json, text/javascript, */*

is missing, use postJSON() instead.

Robin.

I've also tried with postJSON, but I guess that's not the problem. I keep getting the same error.

I racked my brains for the whole day & came to realize that if i send String, Integer as replies from my controller back to the jsp, the whole thing works well.
But the time I start sending objects/List of Objects, the code breaks with HTTP 406?
Why is it so?
Please help.

[deathfrag]

I also tried the getJSON function and got the same HTTP 406 error:

Response Headers
Server	Apache-Coyote/1.1
Content-Type	text/html;charset=utf-8
Content-Length	1070
Date	Sun, 13 Feb 2011 14:38:16 GMT

Request Headers
Host	localhost:8080
User-Agent	Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13
Accept	application/json, text/javascript, */*; q=0.01
Accept-Language	en-us,en;q=0.5
Accept-Encoding	gzip,deflate
Accept-Charset	ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive	115
Connection	keep-alive
x-requested-with	XMLHttpRequest
Referer	http://localhost:8080/Auditions/
Cookie	JSESSIONID=62D82E42596B6C8E31EEC76AF28EA81E

[robin]

In order to isolate the problem I would start with allowing a GET request for that method and return a single StateNames instance. Then test the returned value by calling the URL using:

curl -X GET -H "Content-Type: application/json" http://localhost.../getCities

Do you see json content or not?
Then I would change the return value back to a list. I'm not sure whether this is supported out of the box, I'm am using a list of values but only wrapped in a return object, not in the return value itself. I can't remember if the reason was that it isn't supported or if this is just an coincendence.