user authentication package

I need a quick 开发者_运维技巧and dirty way to authenticate user(GUI is also included) in java web start app, how/where can I find one?

if I need to make it a webapp (war file), that's fine too.

In which approach do you want to authenticate the user? Local authentication or third-party based authentication? Don't known any utilizable library for local authentication. However, openID or oAuth can be employed if you want trusty service provider help you complete.