Twitter Bootstrap Typeahead doesn't process response
===

I have srping mvc controller:

    @Controller
    @RequestMapping(value = "/bla")
    public class TestController {	    
        @RequestMapping(value = "json", method = RequestMethod.POST)
    	public @ResponseBody String getJson(@ModelAttribute SearchQueryJson searchQueryJson) {
    		System.out.println("hih");
    		System.out.println(searchQueryJson.getQuery());		
    		return new String("{'asd','asdd'}");
    	}
    }

and js:

    <script>
		$("#searchbox").typeahead({
			source: function (typeahead, query) {
		        return $.post("bla/json", { query: query }, function (data) {
		            return typeahead.process(data);
		        });
		    }
	    });
	</script>
at google chrome debugger i see response {'asd','asdd'}, but nothing happens (dropdown at search box doesn't appears)! i'm using http://stackoverflow.com/questions/11235644/twitter-bootstrap-typeahead-method-tolowercase-of-undefined and https://gist.github.com/2712048