Servlet 4 web.xml schema: listener not found.
<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_4_0.xsd"
version="4.0">
....
</web-app>
The schema at http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd is not a complete schema. Trying to look for listener element.
