A project for GraphQL Spring Boot Implementation

Prerequisites

You should know Spring Boot, Data, MVC. You should be familiar with JSON, Java Reflection API.

You should at least read some examples, guides about Spring Boot with GraphQL usage which I will not talk about and there is no documentation in this project.(There are amazing guides about this though, especially this one: https://www.pluralsight.com/guides/building-a-graphql-server-with-spring-boot )

Disclaimer

This project is based on this: https://github.com/eh3rrera/graphql-java-spring-boot-example

Start

There are many examples on the internet about GraphQL, but they all doing the same thing: Querying API from GraphiQL which is visualisation tool for GraphQL and it is good.

But in real life you need also consume the API and it is little different from REST based APIs. You need to pass GraphQL based JSON to the endpoint of "/graphql"(it is default one and changeable).

This project will help you how to create the API and consume it.

Instructions

Just clone the project and run it. If you go to "localhost:8080" you will see a form and entering random strings will trigger 3 different Author fields visibility, to be honest i just used this for testing.

The real GraphQL things happen in:

    localhost:8080/checkbox

Here you will see 3 different fields in Author class. There are checkboxes for which fields are you querying. Result screen shows only selected fields and they are class independent, so you can pass any POJO. This is happening thanks to Java Reflection API, at runtime it checks fields and dynamically creates fields and relative checkboxes.

GraphQL plusses

This way we can use advantages of GraphQL by only getting specific data from API provider. Classic REST based API's sends every data even if you were querying for only part of it.