Java DGS Framework example

This repository is an example application for the DGS Framework. The example is a standalone GraphQL server in Java.

It shows the following features:

• Datafetchers
• Mutations
• DataLoader to prevent the N+1 problem
• Query testing
• Using a generated Query API
• Using the Gradle codegen plugin
• A custom instrumentation implementation
• Subscriptions
• Testing a subscription
• Registering an optional scalar from graphql-java

Other examples

There are other examples of using the DGS framework as well:

• WebMVC implementation of this example
• Kotlin implementation of this example
• Federation examples (with Apollo Gateway)

Shows and Reviews

This example is built around two main types: Show and Review. A Show represents a series or movie you would find on Netflix. For ease of running the demo, the list of shows is hardcoded in ShowsServiceImpl . A show can have Reviews. Again, for ease of running the demo, a list of reviews is generated during startup for each show in DefaultReviewsService .

Reviews can also be added by users of the API using a mutation, and a GraphQL Subscription is available to watch for added reviews.

Starting the example

The example requires Java 11. Run the application in an IDE using its main class or using Gradle:

./gradlew bootRun

Interact with the application using GraphiQL on http://localhost:8080/graphiql.