Created attachment 1066322 [details]
The jsf-bug-reproducer.zip/jboss-welcome-bug-1.0-SNAPSHOT.war can be used to reproduce the issue in a plain JBoss EAP 6.4.2(latest)

Description of problem:

welcome files in web.xml don't work for *.jsf


Version-Release number of selected component (if applicable):


How reproducible:
Every Time

Steps to Reproduce:
1) deploy a JSF Application with the following in web.xml:-
   ...

    <servlet>
        <servlet-name>Faces Servlet</servlet-name>
        <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.jsf</url-pattern>
    </servlet-mapping>

    ...

    <welcome-file-list>
        <welcome-file>index.jsf</welcome-file>
    </welcome-file-list> 

2) go to /yourcontext/ 
--> jboss show you a 404 page: JBWEB000065: HTTP Status 404 - /yourcontext/

3) go to /yourcontext/index.jsf
--> it displays the page.

Actual results:

404 page: JBWEB000065: HTTP Status 404

Expected results:

To display the *.jsf welcome page

Additional info:

The reproducer is attached.
The issue is fixed in WILDFLY 8.1.0 CR1 and FINAL.

Workaroud exists:-

Yes, create a dummy(and plain or empty) *.jsf (index.jsf for example) inside the war which allows to have the welcome-root as index.jsf and works as expected.