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.
Of course there's no exception or output on the server side. Have you checked the Java console to see if the applet is throwing an exception yet? If not, then that is the first thing you should do next.
subject: Hit A Servlet From an Applet with values in the URL for the Servlet