My colleague, Adam Anderson, presented a session at EclipseCon 2021 on how easy and powerful it is to mix MicroProfile GraphQL and Jakarta Persistence (JPA) to expose relational database entities to the world as a GraphQL service. It’s a 25 minute presentation with some great Q&A at the end.
You can view the sample code used in the session at:
https://github.com/OpenLiberty/sample-graphql-jpa