Spring Boot + GraphQL Hello World Example
Implementation
We will be creating Spring Boot Maven Project as follows -The pom.xml we will be adding the GraphQL dependencies
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.3.0.RELEASE</version> <relativePath /> </parent> <groupId>com.javainuse</groupId> <artifactId>boot-graphql</artifactId> <version>0.0.1-SNAPSHOT</version> <name>boot-qraphql</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>com.graphql-java-kickstart</groupId> <artifactId>graphql-spring-boot-starter</artifactId> <version>7.0.1</version> </dependency> <dependency> <groupId>com.graphql-java-kickstart</groupId> <artifactId>graphiql-spring-boot-starter</artifactId> <version>7.0.1</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>Create the Spring Boot bootstrap class as follows-
package com.javainuse; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class BootGraphqlApplication { public static void main(String[] args) { SpringApplication.run(BootGraphqlApplication.class, args); } }Next create the GraphQL class=
package com.javainuse.query; import org.springframework.stereotype.Component; import graphql.kickstart.tools.GraphQLQueryResolver; @Component public class Query implements GraphQLQueryResolver { public String helloWorld() { return "Hello World"; } }Create the schema file-
type Query{ helloWorld : String }Start the Spring Boot Application. And go to http://localhost:8080/graphiql as follows-
Now use the following GraphQL query as follows-
query{ helloWorld }