2.0 – Client, Resource Server, Authorization Server, JWT support spring-projects/spring-security Nextgen OAuth 2.0 – Client (since Spring Security 5.0), Resource Server (since Spring Security 5.1) spring-projects/spring-boot Auto-config for Legacy OAuth 2.0 & enhanced SSO support (in Spring Boot 1.x) Auto-config for Nextgen OAuth 2.0 (since Spring Boot 2.0) spring-projects/spring-security-oauth2-boot Auto-config for Legacy OAuth 2.0 & enhanced SSO support (for Spring Boot 2.0)