Article with Chinese title can't be commented

[江岭]

I have installed roller 2.1,it sames everything is good except the article
with chinese title cannot be commented,and other URI problem with Chinese
charater.I have read the mailing list archive,and find this page:
http://www.cheblogs.com/roller/page/pangmao,has the same problem,all the
Chinese word display correctly,but cannot comment it.
I have set the URIEncoding to UTF-8 in tomcat's server.xml.
Who can tell me what's wrong with it,and how solve this problem?Does anyone
use roller use Chinese word completely success?
Thanks.