This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
If you are using JDK 1.5 and your configuration file is only of type key value pair then you might want to use java.util.Properties which not only supports .properties file , but also a simple xml file.For more information you might want to refer the Javadoc for JDK1.5
Otherwise you can load the xml file into a DOM and then use XPath to fetch values from it.