A tutorial covering two Spring Data features for GraphQL Java APIs: the @GraphQLRepository annotation and AOT repositories. The @GraphQLRepository annotation automatically generates data fetchers and enables dynamic query-by-example filtering without writing controllers or individual data fetcher mappings. AOT repositories, enabled via a Maven plugin, shift Spring Data repository implementation generation from runtime to compile time, yielding 50-70% startup improvements in larger applications and making generated SQL queries visible and debuggable. Both features work with Spring Data JPA and JDBC.
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