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.
It's not an error; it's a warning. You can safely ignore it, but it's telling you that there's a better way to do something that you're doing. It's also telling you how to find out more about what specifically the problem is: add "-deprecation" to your "javac" command line, and it will tell you specifically what deprecated API you're overriding.
"Deprecated" basically just means "being replaced by something better."