There is a missing library for Ribon in 1.5.10.SP2 BOM:

[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[ERROR] 'dependencies.dependency.version' for org.springframework.cloud:spring-cloud-starter-ribbon:jar is missing. @ com.redhat.xpaas:greeting-service:[unknown-version], /tmp/src/pom.xml, line 17, column 21