Spring Boot JWT Authentication: The Complete Setup Most Tutorials Get Wrong

I've read probably forty Spring Boot JWT tutorials over the years. They all show you the same thing: how to generate a token on login, how to validate it on each request, and how to wire up SecurityFilterChain . And they all stop right there. What they skip is everything that matters in production: refresh token rotation, token revocation, and not sending tokens in JavaScript-readable headers when you don't have to. I've inherited two codebases where a "working JWT implementation" turned out to