package Ġpl . pol sl . timetable . course . room Ċ Ċ import Ġorg . springframework . data . jpa . repository . Jpa Repository Ċ import Ġjava . util .* Ċ Ċ interface ĠClass room Repository : ĠJ pa Repository < Jpa Class room , ĠLong > Ġ{ ĊĠĠĠ Ġfun ĠfindBy Room ( room : ĠString ): ĠOptional < Jpa Class room > Ċ }