Spring MVC: @ModelAttribute decoded correctly but @RequestParam decoded wrongly

[truetime]

For @ModelAttribute scenario, the request is generated by browser.
Here is the request information

Request URL:http://localhost:8080/Azelea/register
Request Headersview source
Accept:text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Content-Type:application/x-www-form-urlencoded
Origin:http://localhost:8080
Referer:http://localhost:8080/Azelea/register
User-Agent:Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.89 Safari/537.1
Form Dataview URL encoded
email:sdf@mm.com
password:11
salutation:先生
fullName:组件
company.name:
company.id:
locale:zh_CN

thanks for filter org.springframework.web.filter.CharacterEncodingFi lter in web.xml, the chinese character in salutation and fullName are read correctly by ModelAttribute in controller.

For @RequestParam scenario, the request is generated by jQuery UI autocomplete.
Here is the request information

Request URL:http://localhost:8080/Azelea/company/search?term=%E4%BA%A4%E4%BA%92
Request Headersview source
Accept:application/json, text/javascript, */*; q=0.01
Referer:http://localhost:8080/Azelea/register
User-Agent:Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.89 Safari/537.1
X-Requested-With:XMLHttpRequest
Query String Parametersview URL encoded
term:交互

Notice the term is correctly encoded as %E4%BA%A4%E4%BA%92
but in this case, the controller get a wrong term: 交互
the signature of this controller is:

@RequestMapping(value = "/company/search", method = RequestMethod.GET)
@ResponseBody 
public List<Organization> findCompanyName(@RequestParam(required=false) String term) {

where is the problem? why CharacterEncodingFilter can't work on second scenario?