Tomcat server in Eclipse errors on web.xml

I'm new to JSP/JSF & Richfaces & Tomcat.

I currently have a project checkout out locally and have tomcat configured in my eclipse installation to run my project.

Now the following message seems to be randomly occurring when I start t开发者_JS百科omcat from eclipse:

"cvc-pattern-valid: Value 'head' is not facet-valid with respect to pattern '($||\p{L})(\p{L}|\p{Nd}||$)*' for type 'null'."

I originally thought it was when I was making changes to my web.xml file. Mainly because when I would go back and undo a change I made, the server would start up successfully.

But sometimes it seems that this error will be thrown, I will make no changes, come back 10 minutes later and start the server and it works fine!

I should also add that immediately after that error message I describe the following also is displayed:

SEVERE: Error listenerStart
20-Jan-2011 16:33:56 org.apache.catalina.core.StandardContext start
SEVERE: Context [/myApp] startup failed due to previous errors
20-Jan-2011 16:33:56 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/myApp] appears to have started a thread named [pool-2-thread-1] but has failed to stop it. This is very likely to create a memory leak.
20-Jan-2011 16:33:56 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads

Any ideas?

If you know that your app can be deployed on a tomcat instance without this problem then it should be an issue with the way tomcat has been setup from eclipse. Also is tomcat shutting down without a problem? I would suggest create a new tomcat server (quickly by right clicking on the servers panel > New > Server) and redeploy there in order to eliminate the one-off case.