Kwonkyu Kwonkyu

There is no such thing as stateless authentication

The big "make everything stateless" hype is just that: hype. Your server-side application code, should usually be stateless, because this makes your application more resilient to errors, easier to scale, and easier to reason about. But there are exceptions to even that, especially for stuff like video game servers.

Your services are almost always going to be stateful, and should be. If you have a database, files, or literally anything that affects the responses the server sends, then the service is not stateless.

So building "stateless" services is a lie. You shouldn't strive to make your services stateless, you should make sure you're putting your state in the correct place.

Where does my state go?

Stop using JWTs!

TLDR: JWTs should not be used for keeping your user logged in. They are not designed for this purpose, they are not secure, and there is a much better tool which is designed for it: regular cookie sessions.

If you've got a bit of time to watch a presentation on it, I highly recommend this talk: https://www.youtube.com/watch?v=pYeekwv3vC4 (Note that other topics are largely skimmed over, such as CSRF protection. You should learn about other topics from other sources. Also note that "valid" usecases for JWTs at the end of the video can also be easily handled by other, better, and more secure tools. Specifically, PASETO.)

A related topic: Don't use localStorage (or sessionStorage) for authentication credentials, including JWT tokens: https://www.rdegges.com/2018/please-stop-using-local-storage/

The reason to avoid JWTs comes down to a couple different points:

The JWT specification is specifically designed only for very short-live tokens (~5 minute or less). Sessions

Thread Pools

Thread pools on the JVM should usually be divided into the following three categories:

CPU-bound
Blocking IO
Non-blocking IO polling

Each of these categories has a different optimal configuration and usage pattern.

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