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.
in most cases, don't restart the application server. instead, you can start the related application context as bill said.
If you don't want to restart that application context, you may jump to the work directory and delete the correspondent servlet code. Next time if the servlet is accessed, the servlet will be recompiled and re-instantiated.