Add Validations to the GraphQL Schema with Example

Hey guys in this post, we will add validations to the GraphQL schema with Spring Boot Example. This is a continuation of the previous post, please follow that post before proceeding with this.

Complete example

Let’s create a step-by-step spring boot project and Add validation to the GraphQL schema

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Create spring boot project

There are many different ways to create a spring boot application, you can follow the below articles to create one –

>> Create spring boot application using Spring initializer
>> Create spring boot application in Spring tool suite [STS]
>> Create spring boot application in IntelliJ IDEA

Add maven dependencies

Open pom.xml and add the following dependencies –

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="" xmlns:xsi=""
		<relativePath/> <!-- lookup parent from repository -->
	<description>Spring data jpa</description>



spring-boot-starter-web dependency for building web applications using Spring MVC. It uses the tomcat as the default embedded container.

graphql-spring-boot-starter dependency is the starter dependency for GraphQL and spring boot. graphiql-spring-boot-starter dependency provides the interface to test GraphQL queries. graphql-java-tools dependency helps us to scan the graphql files having the extension .graphqls

Create a Request class

Create inside the in.bushansirgur.springboot.model package and add the following content

package in.bushansirgur.springboot.model;

public class SampleRequest {

	private String firstName;
	private String lastName;

	public String getFirstName() {
		return firstName;

	public void setFirstName(String firstName) {
		this.firstName = firstName;

	public String getLastName() {
		return lastName;

	public void setLastName(String lastName) {
		this.lastName = lastName;

This class is a simple POJO class, contains private fields, setters, getters, and toString().

Create a service class

Create inside the in.bushansirgur.springboot.resolver package and add the following content

package in.bushansirgur.springboot.resolver;

import org.springframework.stereotype.Service;


import in.bushansirgur.springboot.model.SampleRequest;

public class Home implements GraphQLQueryResolver{
	public String fullName(SampleRequest sRequest) {
		return sRequest.getFirstName() + " " + sRequest.getLastName();

	public String home () {
		return null;

Create a schema

Create home.graphqls file inside the schema folder and place it inside the resources folder

Note: filename and folder doesn’t matter here you can create with any file name and folder but it should have the extension .graphqls

type Query {
	fullName(sampleRequest: SampleRequest): String
        home: String!
input SampleRequest {
	firstName: String!,
	lastName: String

We will add ![Exclamtory] at the end of the type indicating that it should not return null. It should always return non-nullable value.

Run the app

Run the application using the below maven command –

mvn spring-boot:run

Open the Altair plugin in chrome and execute the following query-



Bushan Sirgur

Hey guys, I am Bushan Sirgur from Banglore, India. Currently, I am working as an Associate project in an IT company.

This Post Has One Comment

  1. Manisha J

    I want to validate graphql schema and “graphql-java-tools” dependency is not working to validate it.
    For example input object added in type object.
    Could you please suggest some plugins who can help to detect schema related issue while building any application.

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