To properly clone this repository, use the --recursive option to clone so that the sso submodule is checked out fully:
[Obsidian 547]$ git clone --recursive https://github.com/snowdrop/spring-boot-http-secured-booster
Cloning into 'spring-boot-http-secured-booster'...
remote: Counting objects: 860, done.
remote: Compressing objects: 100% (7/7), done.
remote: Total 860 (delta 1), reused 0 (delta 0), pack-reused 853
Receiving objects: 100% (860/860), 17.03 MiB | 6.43 MiB/s, done.
Resolving deltas: 100% (408/408), done.
Submodule 'sso' (https://github.com/obsidian-toaster-quickstarts/redhat-sso) registered for path 'sso'
Cloning into '/Users/starksm/Dev/JBoss/Obsidian/spring-boot-http-secured-booster/sso'...
Submodule path 'sso': checked out 'cd9fbf0980a3930ca7da1f1814a040bf5b032e96'
[Obsidian 548]$ cd spring-boot-http-secured-booster/
http://appdev.openshift.io/docs/mission-secured-spring-boot.html