JSP encoding (set in web.xml)

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

Instead of repeating the pageEncoding over all JSP pages, you could also set it globally in web.xml as below:

web.xml :

<jsp-config>
    <jsp-property-group>
        <url-pattern>*.jsp</url-pattern>
        <page-encoding>UTF-8</page-encoding>
    </jsp-property-group>
</jsp-config>

https://stackoverflow.com/questions/33941751/html-form-does-not-send-utf-8-format-inputs