spring framework:
http://repo.spring.io/libs-release-local/org/springframework/spring/
spring boot:
http://repo.spring.io/libs-release-local/org/springframework/boot/spring-boot/
spring cloud:
http://repo.spring.io/libs-release-local/org/springframework/cloud/spring-cloud/
spring security:
http://repo.spring.io/libs-release-local/org/springframework/security/spring-security/