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.
The Web Services FAQ, which is linked in my signature, has links to articles on how to use JAX-RPC handlers. Whether the handler performs logging or something else makes no difference (the details on how to log would of course differ on the client and the server).