please note these:
at first step you should try this in this url ./WEB-INF/web.xml,
for example :

    <servlet>
        <servlet-name>Logout Servlet</servlet-name>
<servlet-class>com.basamadco.opxi.manager.servlet.LogoutServlet</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>Logout Servlet</servlet-name>
        <url-pattern>/logoutServlet</url-pattern>
    </servlet-mapping>