web-fragment.xml

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
	 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	 xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
	 version="3.1">
     <context-param>
        <param-name>preference</param-name>
        <param-value>first</param-value>
    </context-param>

</web-app>