For more information, you can refer to these links:
- RESTful Java Web Services Security, René Enríquez, Andrés Salazar C, Packt Publishing: https://www.packtpub.com/application-development/restful-java-web-services-security
- Spring Security [Video], Packt Publishing: https://www.packtpub.com/application-development/spring-security-video
- The OAuth 2.0 Authorization Framework: https://tools.ietf.org/html/rfc6749
- Spring Security: http://projects.spring.io/spring-security
- Spring OAuth2: http://projects.spring.io/spring-security-oauth/