Spring for GraphQL support/ sample

[deki]

At re:Invent 2023 someone asked if we are supporting Spring for GraphQL https://docs.spring.io/spring-graphql/reference/. Goal of this issue is to check that and ideally add a sample for it.

[mbfreder]

Thanks for raising this. I will check if it's already supported.

[fredbonin]

Hi,
I can confirm that GraphQL works.

I've used the code here to test it :
https://spring.io/guides/gs/graphql-server/ and it just worked (I added a StreamLambdaHandle as documented here https://github.com/aws/serverless-java-container/wiki/Quick-start---Spring-Boot3).

However, I had issues when integrating with JPA. It was necessary to add the config below:

spring:
  jpa:
    open-in-view: false

If it was not added, the handler was going in an infinite loop (waiting for a latch). This was not necessary for REST API (in any case, it is good practice to disable this for all spring applications)