Upstream pgjdbc fails to build after [1] pull request. That adds two more dependencies (maven-shade-plugin) and (com.ongres.scram), that's afaik not yet in Fedora and we need to analyse whether we can include it, or we rather have to work on build-time condition. [1] https://github.com/pgjdbc/pgjdbc/pull/982
This bug appears to have been reported against 'rawhide' during the Fedora 28 development cycle. Changing version to '28'.
Blocking bug is resolved (ongres-scram package added), and this is fixed in F28+.