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.
I had a similar, but different problem with Tomcat 6. Each time it started it would create a new tomcat-users.xml file with no content between the <tomcat-users> and the </tomcat-users> tag. After much wailing and gnashing of teeth and I spotted that all the content that I *thought* was in there was in fact commented out in the default file.