Code Mill Hub | Backend Engineering https://code-mill-hub.com/blog/ Deep dives into Java, Spring Boot, and high-performance backend architecture. en-us shflzp12@gmail.com (Maria) shflzp12@gmail.com (Maria) Fri, 12 Jun 2026 00:00:00 GMT https://code-mill-hub.com/blog/spring-boot/2026-06-12-mastering-microservice-security-oauth2-oidc-spring-boot/ OAuth 2.0 and OIDC for Spring Boot APIs: Token Validation, Authorization, and Service Calls https://code-mill-hub.com/blog/spring-boot/2026-06-12-mastering-microservice-security-oauth2-oidc-spring-boot/ Secure 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. Fri, 12 Jun 2026 00:00:00 GMT shflzp12@gmail.com (Maria) Spring SecurityOAuth 2.0OpenID ConnectJWTMicroservicesAuthorizationAPI Security