JAVA as a Service on WIN NT/Windows 2000

HI,
Has anyone tried to get a java class to run as a service on Windows 2000/WIN NT? I’ve been trying, and while the program starts (log file is updated), Windows 2000 doesn’t seem to realize it has started, and kills it after giving a ‘did not respond’ error. I’m thinking that if I want the program to run as a service, I need to alert the Service Manager that the program is up and running, but have never done this before. Any ideas?