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'm with Jeanne on this one--unless you have a compelling reason for not following one of the most common code conventions it's probably best to follow it.
That said, you can change the regex used for Checkstyle's naming rules in its config file. For instance, some places I've worked use leading and trailing underscores for members and parameters respectively, and we've configured Checkstyle appropriately.