correct your URL
jdbc:mysql://host/database?useUnicode=true&characterEncoding=UTF-8
and try again

set the respose's character encoding to utf-8

you must add unicode (utf) setting to your database  connection parameters.
check my sql documents there is a complete description about this

You can cross all characters from a filter and force them to use UTF8 character encoding.maybe using Filterchain solve your problem.

go to your mysql  and in mysql command prompt type

mysql> show varibles like '%char%';

and also

mysql> show global varibles like '%char%';

and see the results;
database, connection and system variables should be utf-8

if not, you can change this settings by adding
default-character-set=utf-8

in your my.cnf or my.ini below [mysql] and [client]

and restart mysql service.