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Spring Security

Boot 3.x · Security 6.x · jjwt

Interview prep + implementation reference — click any question to expand

Core ComponentsAuth Flow

Request FlowAuth Flow

Filter Chain OrderAuth Flow

JWT Structure & ClaimsJWT

JwtUtil ImplementationJWT

JwtAuthenticationFilterJWT

Auth Endpoint & Token StrategyJWT

OAuth2 TheoryOAuth2

Resource Server ImplementationOAuth2

Method SecurityAuthorization

Unit TestsTesting

Integration TestsTesting

CORS ConfigurationGotchas

Security Headers & HTTPSGotchas

Common MistakesGotchas

Production ChecklistGotchas

Spring Security 6.x · Spring Boot 3.x · Java 17+ · JWT (jjwt) · OAuth2 Resource Server