japanese characters in the uri when deployed to tomcat do not work

hi,

I have deployed my application to tomcat 5. 0.25 on a windows-xp japanese machine .
The context name has combination of english and japanese characters.
1.When i launch the application as follows it gives resourse not found exception(Http 404).
http://localhost:portno/applicationname.
The application name is combination of english and japanese characters.
I overcame the problem of http-404 error by setting the encoding to UTF-8 in web.xml and uri encoding  to UTF-8 in the connector tag of server.xml.

Now the request comes to my application but req.getsession fails because the context name in the request is not encoded.Even though i have set the encoding to UTF-8  through the following statement
req.setCharacterEncoding("UTF-8");

The following is the exception :
javax.servlet.ServletException: app.HServlet.service(): error while processing CMD=null<br>java.lang.IllegalArgumentException: /appname??

the question marks in '/appname??' are nothing but the japanese characters which are not encoded properly.

Thanks
Srinivas