spring-graphql

Spring GraphQL servers use a schema-first approach with schema resources and annotated @QueryMapping or @MutationMapping controllers. You define the schema files, implement the controller mappings, and verify behavior using GraphQlTester-based tests against the defined endpoints.

Spring GraphQL provides GraphQlTester-based tests to verify queries and mutations against the schema. It supports transport-aware execution across HTTP or WebSocket transports, allowing you to validate controller mappings and batching of resolvers within your Spring Boot project.

You need the Spring Boot GraphQL dependency stack, specifically spring-boot-starter-graphql and graphql-test. These dependencies provide the required schema resources, annotated mapping support, and GraphQlTester-based testing capabilities for your Spring Boot application.

Batching for GraphQL resolvers in Spring groups multiple data requests into a single batch to optimize transport-aware execution. This pattern is supported within Spring Boot projects using annotated query and mutation mappings to efficiently resolve data for GraphQL endpoints.

Yes, Spring GraphQL supports a schema-first approach. You define schema resources and then implement the schema using annotated @QueryMapping and @MutationMapping controllers in your Spring Boot project, enabling structured endpoint creation and integrated testing.

Spring GraphQL mutations must align with schema resources and annotated @MutationMapping controllers. Mismatches between the schema definition and the controller mapping cause unexpected responses, which you can identify and verify by running GraphQlTester-based tests against the schema.