GraphQL in Java using SPQR

This is the tutorial Spring Boot application to develop GraphQL API using SPQR and Spring Data JPA using hierarchical datamodel shown below.
The application can be started using mvn spring-boot:run and access the GraphQL PlayGround using http://localhost:8083/gui and use the payloads specified for various Query and Mutation methods. Use the following blog post for more details.

Data Model

Get Department details