This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
That sounds like an error created while parsing one of the xml configuration files, probably web.xml - you need to find a way to check that file for correct formatting. Personally, I use XML SPY, a commercial product that now has some free example applications.