Published onJune 12, 2026OAuth 2.0 and OIDC for Spring Boot APIs: Token Validation, Authorization, and Service CallsSpring-SecurityOAuth-2.0OpenID-ConnectJWTMicroservicesAuthorizationAPI-SecuritySecure Spring Boot resource servers without confusing OAuth authorization with OIDC login: validate issuer and audience, map scopes deliberately, choose user or workload identities, and test the failure paths.