What is the best way to keep user session id or authentication data

[Nakataa Kokuyo]

Good day,

May i know what is the best way to keep user session id to validate user login and usage is valid.

Cookie , session or any other else ?

Thank you !

[Ken Blair]

Often stored as a cookie.

I highly encourage you to look at a framework such as Apache Shiro or Spring Security to manage authentication.