I couldn't find an example that can use graphql-java in a microservice other than spring boot?

Can't I use the graphql-java "Getting start" example just by including the dependency in any maven project?
or does it need to be a Spring project with Handler etc?

https://www.graphql-java.com/documentation/getting-started/
Error:
"The method dataFetcher(String, DataFetcher) from the type TypeRuntimeWiring.Builder refers to the missing type String"