Spring MVC @RequestMapping change character of url in redirect

I have spring-mvc method that request mapping is like this:

@RequestMapping("/person/{personId}/**")

in jsp i set url like :

/person/2/اکبر اکبری

and it is no problem.

when in other method of controller , i am redirecting to this url the address bar of browser shows this:

/person/2/??? ???

What is wrong?what do i do?