GraphQL example implemented with Spring Boot

This is simple example of GraphQL API implemented in Java with Spring Boot, and relaying on it's magic :)

There is example of implementation of Query and Subscription.

Dependencies

GraphQL

For GraphQL dependency added

        <dependency>
            <groupId>com.graphql-java</groupId>
            <artifactId>graphql-java</artifactId>
            <version>8.0</version>
        </dependency>
        <dependency>
            <groupId>com.graphql-java</groupId>
            <artifactId>graphql-java-tools</artifactId>
            <version>5.0.0</version>
        </dependency>

GraphQL Spring Boot integration

To connect GraphQL and Spring Boot added this dependency

        <dependency>
            <groupId>com.graphql-java</groupId>
            <artifactId>graphql-spring-boot-starter</artifactId>
            <version>5.0.2</version>
        </dependency>

GraphiQL "out of the box"

In order to get GraqhiQL, UI for testing local version of GraphQL API added this dependency

        <dependency>
            <groupId>com.graphql-java</groupId>
            <artifactId>graphiql-spring-boot-starter</artifactId>
            <version>5.0.2</version>
        </dependency>

For GraphiQL hit http://localhost:8080/graphiql, when you start application

Query implementation

Query implementation is almost exactly the same like all other my examples of Query. Only difference is annotation @Component at top. For full code just open Query.java

Query example in GraphiQL

query {
  allData {
    message
  }
}

Mutation implementation

Mutation implementation is almost exactly the same like all other my examples of Mutation. Only difference is annotation @Component at top. For full code just open Mutation.java

Mutation example in GraphiQL

mutation {
  add(message:"Hello") {
    message
  }
}

after mutation you can run query again and check if all worked as intended.

Subscription implementation

Subscription implementation is done using RXJava and by implementing GraphQLSubscriptionResolver

For full code example check Subscription.java

Subscription can be tested from GraphiQL.

Subscription example in GraphiQL

subscription {
  data {
    message
  }
}