The XSD at http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd is, I guess, buggy.
The element jsp-config is declared but never defined; not so happens for all other elements, for example "welcome-file-list" or "error-page".
Sounds familiar :
I had reported same kind of issue some time ago (http://nagoya.apache.org/eyebrowse/ReadMsg?listId=140&msgNo=7107)
and I found some other related messages in different forums too : http://forum.java.sun.com/thread.jsp?thread=533748&forum=45&message=2577320
Somebody (can't remember who) replied me directly to tell me it was a known Jetty parsing issue (org.mortbay.xml.XmlParser ?)
I did not find any time to dig into it since then, so I also would appreciate any answers in this thread ;)
Eric
