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jdbc:mysql://${OPENSHIFT_MYSQL_DB_HOST}:${OPENSHIFT_MYSQL_DB_PORT}/jbossews?useUnicode=yes&characterEncoding=UTF-8

<%@ page contentType="text/html;charset=UTF-8" language="java" pageEncoding="UTF-8" %>

 <form action="addMessage" method="get" accept-charset="utf-8">
            <textarea maxlength="600" name="message"></textarea><br/>
            <input type="submit" id="button" value="отправить сообщение"/>
        </form>

create database jbossews default character set = "UTF8" default collate = "utf8_general_ci"

filter>
    <filter-name>encoding-filter</filter-name>
    <filter-class> org.springframework.web.filter.CharacterEncodingFilter </filter-class>
    <init-param>
        <param-name>encoding</param-name>
        <param-value>UTF-8</param-value>
    </init-param>
    <init-param>
        <param-name>forceEncoding</param-name>
        <param-value>true</param-value>
    </init-param>
</filter>

<filter-mapping>
    <filter-name>encoding-filter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

mysql> SHOW VARIABLES LIKE'character%';
 Variable_name             Value
 character_set_client      utf8
 character_set_connection  utf8
 character_set_database    latin1
 character_set_filesystem  binary
 character_set_results     utf8
 character_set_server      latin1
 character_set_system      utf8
 character_sets_dir        /opt/rh/mysql55/root/usr/share/mysql/charsets/


SHOW VARIABLES LIKE 'collation%';
 Variable_name         Value
 collation_connection  utf8_general_ci
 collation_database    latin1_swedish_ci
 collation_server      latin1_swedish_ci