https://www.graphql-java-kickstart.com/spring-boot/
https://github.com/graphql-java-kickstart/graphql-spring-boot

2022
https://medium.com/javarevisited/spring-rest-get-api-vs-spring-graphql-query-api-17314abd07f2
    https://www.youtube.com/watch?v=vCu4ewDLYPA
    https://github.com/polovyivan/spring-graphql-query-vs-rest-get-method