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.
This page of Sun's Java Tutorial has a basic description of the search order. This article provides some additional detail. Although it is about the BootClasspath, I found the article available on this page very informative.