Modify the web.xml file.
For information about how to modify a file, see Modifying Configurations.
Add the following filter:
<filter>
<filter-name>EncodingFilter</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>EncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>IMPORTANT:This must be the first filter in the web.xml file.