In this video we switch from the server side to the client side. We build a standalone Spring Boot application that calls our GraphQL API using Spring's built-in HttpSyncGraphQlClient. We walk through the whole process from constructing the client with a RestClient, defining your query as a document, passing in variables and deserializing the response directly into your entity classes. If you've ever needed to consume a GraphQL API from Java this is how you do it with Spring.

📹 About this Course
In this series you'll learn how to build a GraphQL API from scratch using Spring Boot. We'll start with why GraphQL exists and work our way through schema design, data fetchers, performance optimization, observability and more. 

📦 GitHub Repository - GraphQL Books: https://github.com/danvega/graphql-books
📖 Spring for GraphQL Documentation: https://docs.spring.io/spring-graphql/reference/
🔧 GraphQL Java: https://www.graphql-java.com/
🚀 Spring Initializr: https://start.spring.io
📘 GraphQL Specification: https://spec.graphql.org

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Website: https://www.danvega.dev
Twitter: https://twitter.com/therealdanvega
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Dan Vega

A walkthrough of using Spring for GraphQL's HttpSyncGraphQlClient to consume a GraphQL API from a Java client application. The tutorial covers setting up a standalone Spring Boot app with WebApplicationType.NONE, building the client using RestClient.Builder, writing document-based queries with variables, and mapping responses to entity classes using toEntity(). It also touches on the async alternative (retrieveSync vs retrieve with WebFlux), storing queries in resource files, and using the client for integration testing.

GraphQL for Java Developers: 08 - Client Integration with HttpSyncGraphQlClient