GraphQL Java

What GraphQL Java is

GraphQL Java is a free, open-source Java implementation of GraphQL for building services on the JVM. Its workflow includes parsing a schema, connecting data fetchers, building an executable schema, and executing queries. Each GraphQL field can use a DataFetcher; the library also includes PropertyDataFetcher for reading values through POJO field-name patterns. The documentation describes java-dataloader for batching and caching requests, but batching works with AsyncExecutionStrategy. Other execution strategies may cache values without batching. GraphQL Java requires Java 11 or later and is distributed as Gradle and Maven dependencies from Maven Central. It is self-hosted and available for API use under the MIT License. The homepage lists Spring GraphQL, Netflix DGS, and Atlassian alongside the project. The security policy says maintainers patch the latest version and may backport fixes to versions from the previous 18 months, depending on severity and demand. Questions go to GitHub Discussions, and the project is run by volunteer maintainers.

Who it suits

GraphQL Java suits Java developers building GraphQL services on the JVM who can meet its Java 11 minimum and manage a self-hosted deployment.

Limits

The project requires Java 11 or later. DataLoader batches requests with AsyncExecutionStrategy; other execution strategies may cache values but do not batch them.

Getting started

1. Visit the GraphQL Java website and review its getting started guide.
2. Add the Gradle or Maven dependency available from Maven Central.
3. Use Java 11 or later.
4. Parse a schema, wire data fetchers and build an executable schema.
5. Execute a query; use AsyncExecutionStrategy if you need DataLoader batching.

Verdict

GraphQL Java provides the core tools for building and running GraphQL services in Java. Developers should account for its Java 11 minimum and the execution-strategy limitation on batching.