spring-boot-security-jwt

JWT authentication in Spring Boot uses Spring Security 6.x to generate, validate, and refresh tokens for stateless API requests. Configure a UserDetails service, set up JWT signing with RSA/HMAC/ECDSA, and protect endpoints with @PreAuthorize annotations to enforce role-based access control without server-side session storage.

Yes, JWT supports OAuth2 resource server configurations and multi-tenant RBAC/ABAC scenarios. You can validate tokens issued by OAuth2 providers, enforce tenant isolation through claims, and apply attribute-based access control policies across microservices without maintaining centralized session state.

Token rotation and revocation in JWT systems use refresh token flows, token blacklisting with database backing, and short-lived access tokens. Spring Security 6.x integrates with database-backed stores to track revoked tokens, enabling secure token lifecycle management in RESTful services and microservices.

JWT enables stateless inter-service authentication by embedding cryptographically signed claims that each service validates independently. Use RSA public-key validation, service-specific claims, and Spring Security filters to authenticate requests between microservices without external token stores.

Yes, JWT supports both RBAC (role-based access control) and ABAC (attribute-based access control) through custom claims and @PreAuthorize expressions. Spring Security 6.x evaluates permissions and attributes from token claims to grant or deny access based on roles, groups, or dynamic attributes.

Spring Boot JWT implementations support RSA asymmetric signing, HMAC symmetric signing, and ECDSA elliptic-curve signing. Choose RSA for public-key distribution across services, HMAC for shared-secret environments, or ECDSA for compact, high-performance token validation.