The below link provides information about the different versions of Spring Release. It has covered most of the versions however, it doesn't mention about a version like currently there are different versions available for GA e.g

• 2.4.5
• 2.3.10.RELEASE
  Here 2.4.5 is not clear when this should be used instead of a .RELEASE version.
  Please update the documentation to provide more details about this.

Link to documentation:

https://github.com/spring-projects/spring-build-gradle/wiki/Spring-project-versioning

Please modify file docbook.grandle. Change repo URL:
'http://shibboleth.internet2.edu/downloads/maven2'
to
'https://build.shibboleth.net/nexus/content/repositories/thirdparty/'
because repo 'http://shibboleth.internet2.edu' not working.

For gradle dependencies like this:
compile group: 'org.slf4j', name: 'slf4j-simple', version: '1.7.+'

the maven plugin maps it to:

org.slf4j
slf4j-api
1.7.+
compile

But the contents of the version tag should look like this:
[1.7.+)

See http://www.maestrodev.com/better-builds-with-maven/creating-applications-with-maven/resolving-dependency-conflicts-and-using-version-ranges/

The code here:
https://github.com/spring-projects/spring-build-gradle/blob/master/maven-deployment.gradle
seems to copy the version info verbatim w/o checking for this case:
https://github.com/spring-projects/spring-build-gradle/blob/master/maven-deployment.gradle