migration guide (http://docs.jboss.org/richfaces/latest_4_0_X/Migration_Guide/en-US/html/chap-Migration_Guide-Upgrading.html#sect-Migration_Guide-Upgrading-Before_upgrading) and readme-ui contains info that
I also will add that to "how to use with maven" wiki page.
Thank you very much.
It's my fault. Seems when I copy sources in generated project I overwrite "web.xml" too.
Shame on me