GraphQL Microservices Example with Apollo Gateway / Schema Federation

Services

• Product Service here
• Account Service here
• Order Service here

Playground

• Gateway http://localhost:4000/playground

Single Services:

• Product-Service http://localhost:8081/playground
• Account-Service http://localhost:8082/playground
• Order-Service http://localhost:8083/playground

Query

Query by Order

You can query order ids from 1-3

{
  order(id: "1") {
    id
    title
    account {
      id
      firstname
      lastname
      orders {
        id
        title
      }
    }
    products {
      name
      description
      price
    }
  }
}

Query by Account

You can query account ids from 1-2

{
  account(id: "1") {
    firstname
    lastname
    orders {
      id
      title
      products {
        id
        name
        description
      }
    }
  }
}

Run

Run with IntelliJ

Wait for maven import and click on "Show run configurations in Services"

Then you can start all Services with one click

Run with Maven Wrapper

It also possible to start services with Maven. This must be done in every service subfolder.

./mvnw spring-boot:run -f product-service/pom.xml
./mvnw spring-boot:run -f account-service/pom.xml
./mvnw spring-boot:run -f order-service/pom.xml

Run Apollo Gateway

Last, start Apollo Gateway in subfolder: "graphql-gateway". See here.

npm --prefix graphql-gateway install
npm --prefix graphql-gateway start

References

• https://www.apollographql.com/docs/federation/
• https://github.com/apollographql/federation-jvm