https://github.com/t1/smallrye-graphql-federation-demo

Demo project to show the GraphQL Federation backend support in SmallRye GraphQL
https://github.com/t1/smallrye-graphql-federation-demo

Last synced: 10 months ago
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Demo project to show the GraphQL Federation backend support in SmallRye GraphQL

• Host: GitHub
• URL: https://github.com/t1/smallrye-graphql-federation-demo
• Owner: t1
• Created: 2022-09-02T10:10:42.000Z (almost 4 years ago)
• Default Branch: main
• Last Pushed: 2025-09-30T12:48:13.000Z (10 months ago)
• Last Synced: 2025-09-30T14:47:10.149Z (10 months ago)
• Language: Java
• Size: 40.6 MB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 2
• Metadata Files:
  • Readme: README.adoc

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README

          
= SmallRye GraphQL Federation Demo image:https://github.com/t1/smallrye-graphql-federation-demo/actions/workflows/maven.yml/badge.svg[link=https://github.com/t1/smallrye-graphql-federation-demo/actions/workflows/maven.yml]

This is a little demo project to show the GraphQL Federation backend support in https://github.com/smallrye/smallrye-graphql[SmallRye GraphQL].

== Parts

* `product` GraphQL backend `war`: serves the name and the description.

* `price` GraphQL backend `war`: extends the product by a price.

* `order` GraphQL backend `war`: uses products for the order items.

* `gateway` GraphQL Federation server: combines the three backends (subgraphs) into One API (supergraph).

* `printer` Quarkus GraphQL CLI client: calls the gateway to print an order with all details.

== Test & Run

Just run `mvn verify`.

But you can deploy the three `war` files to any https://jakarta.ee[Jakarta EE 10] server with https://github.com/eclipse/microprofile-graphql[MicroProfile GraphQL] support, e.g. https://www.wildfly.org/downloads/[WildFly] with the https://github.com/wildfly-extras/wildfly-graphql-feature-pack[GraphQL Feature Pack]. We use my WildFly Docker Image `rdohna/wildfly:latest` via https://github.com/t1/jee-testcontainers[JEE Testcontainers].

The `gateway` uses https://wundergraph.com[Wundergraph]. To start it, run:

[source,bash]

----

./gateway/router

----

Then the UI runs on http://localhost:3002 and you can execute, e.g.:

[source,graphql]

----

query order1 {

  order(id:"1") {

    customerNumber

    customerName

    orderDate

    orderItems {

      position

      amount

      product {

        name

        description

        price

      }

    }

  }

}

----

If you change the schema, you'll have to regenerate the `config.json`. You'll need `wgc` for that:

[source,bash]

----

npm install -g wgc@latest

----

Then run (while the three services are running):

[source,bash]

----

wgc router compose -i compose.yaml -o config.json

----