Spring Security with JWT (Custom Authentication Provider + Token Generation)

Today we combine our Custom AuthenticationProvider with JWT-based Security —
so once a user is authenticated using our own logic, we issue them a JWT token for stateless authentication.

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What You’ll Learn

✅ How to integrate AuthenticationProvider with JWT
✅ How to generate and validate JWT tokens
✅ How to protect REST endpoints using OncePerRequestFilter
✅ How to manage stateless sessions with JWT

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