Your package swingx failed to build from source in current rawhide. http://koji.fedoraproject.org/koji/taskinfo?taskID=7008838 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_21_Mass_Rebuild
Created attachment 906895 [details] build.log
Created attachment 906896 [details] root.log
Created attachment 906897 [details] state.log
Fixed in rawhide: http://koji.fedoraproject.org/koji/buildinfo?buildID=539889