Maven multi-module projects and version properties - flatten-maven-plugin

gistfile1.txt

If building multi-module projects and publishing/installing to a repo, version properties like ${revision} are not
consistently replaced at install time. This results in errors when attempting to refer to one of these modules
as a dependency from another project, and instead of library:1.0.0 resolving, you'll see an error where
it's attempting to reference library:${revision} instead.

See discussion here:
https://stackoverflow.com/questions/41086512/maven-issue-to-build-one-module-using-revision-property

To fix, to need to add the flatten-maven-plugin:
https://maven.apache.org/guides/mini/guide-maven-ci-friendly.html#install-deploy