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.
These links should be good for help. I read it carefully and I got how it works. Also, at the end of the techtip article they recommend to look at LogRecord and Charset classes in the JDK API and I looked at their sources to see how they are using ThreadLocal..