request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");

con=DriverManager.getConnection("jdbc:mysql://localhost:3306/projectkkm?useUnicode=yes&characterEncoding=UTF-8","root","");

<%@page pageEncoding="UTF-8" %>

<filter>
    <filter-name>setCharacterEncodingFilter</filter-name>
    <filter-class>org.apache.catalina.filters.SetCharacterEncodingFilter</filter-class>
    <init-param>
        <param-name>encoding</param-name>
        <param-value>UTF-8</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>setCharacterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

SHOW VARIABLES LIKE 'char%';

character_set_client      utf8
character_set_connection   utf8
character_set_database      utf8
character_set_filesystem  binary
character_set_results        utf8
character_set_server         utf8
character_set_system       utf8

character-set-server = utf8
init-connect='SET NAMES utf8'
collation-server=utf8_general_ci

default-character-set=utf8

<Connector URIEncoding="utf-8" connectionTimeout="20000" port="8084" protocol="HTTP/1.1" redirectPort="8443"/>