I guess that depends on one's definition of "ready-made"

DGS isn't a terrible place to start, if you're already in the Spring ecosystem https://github.com/Netflix/dgs-framework#readme

There's an "awesome" list in the graphql-java org, too: https://github.com/graphql-java/awesome-graphql-java#readme

Here’s a list neatly curated for compatibility with Apollo Federation, so you can be sure that your API is composable:

https://www.apollographql.com/docs/federation/supported-subg...