Where to find a free web server to host my servlet program?

Hi,
I wish to enrich the functionality of my homepage by using servlet. Do you know any free web server on internet that can let me put my servlet program to it? BTW, if there's a one, do I need to put my servlet program in a special directory of the web server or just my own directory?
Thanx

look at http://www.mycgiserver.com
cheers
prabhakar.