Spring Boot - Part 4 (Spring Security & JWT, Lombok, Actuators)
Spring Security + JWT Spring Security adds a gatekeeper in front of your entire application. Every request passes through it befor e reaching your controllers. You define rules — which endpoints are open to everyone and which require the caller to prove their identity first. JWT is how users prove their identity on every request. Instead of sending email and password on every request the user logs in once, gets a token, and sends that token with every subsequent request. The server reads the token and knows exactly who the user is. Together they work like a concert venue: Spring Security = the security system of the venue JWT = the wristband you get at the entrance You prove your identity once at the entrance (login), get a wristband (JWT token), and use that wristband to access different areas (protected endpoints) without proving your identity again. # How JWT Authentication Works in Spring Boot Step 1 — User sends email and password to PO...