package build is working for OpenSuse and Fedora but not for RedHat

Hi,
I am currently testing my ability to provide software through packaging and am quite happy so far, as I was able to build my rpm locally and for OpenSuse und Fedora I also succeeded on the OBS, but I just do not understand how it does not work for RedHat.
After changing the BuildRequire to java-devel >= 1.7, RedHat stopped complaining about dependency issues, but does not use this package as one can see from the log file.
How is it possible to suffice the build requirements and then not being able to use it?
My project is this : https://build.opensuse.org/package/s...ollizeck/NORSp
and here is the link to the log: https://build.opensuse.org/package/l..._RHEL-6/x86_64

I would be grateful for any hints on this problem

Thank you
Sebastian