JWT Auth in Spring Boot 4: The Security 7 Way
Google “Spring Boot JWT tutorial” and the top results still hand you the 2019 recipe: a custom OncePerRequestFilter that parses the Authorization header by hand, a third-party JWT library, a UserDetailsService, and five config classes of glue. It works — the way a hand-rolled ORM works. On Spring Boot 4, Spring Security 7 has first-class JWT support through the built-in OAuth2 Resource Server. No custom filter. No third-party JWT library. Here’s the modern shape, including what Security 7 removed out from under the old tutorials. ...