Your package arquillian-core failed to build from source in current rawhide. http://koji.fedoraproject.org/koji/taskinfo?taskID=6935834 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_21_Mass_Rebuild
Created attachment 903510 [details] build.log
Created attachment 903511 [details] root.log
Created attachment 903512 [details] state.log
Build in Koji: http://koji.fedoraproject.org/koji/buildinfo?buildID=539668 fixed the issue. We need to use 'BuildRequires: junit' rather than 'BuildRequires: junit4' for f21 build.
Let's close now this issue.