This project is a simple Spring Boot application demonstrating a GraphQL API for managing books.
It supports creating new books and querying books from an in-memory H2 database.

• Create a new Book using GraphQL mutation
• Fetch all Books
• Fetch a single Book by ID
• Uses Spring Boot, GraphQL, JPA, and H2 database

• Entity: Book.java — Defines the Book object model.
• Repository: BookRepo.java — Extends JPA repository for database operations.
• Service: BookServiceImpl.java — Contains business logic for book operations.
• Controller: BookController.java — GraphQL queries and mutations mapped here.
• GraphQL Schema: Defined using Book, BookInput, Query, and Mutation types.

• Java 21+
• Spring Boot 3.x
• Spring for GraphQL
• Spring Data JPA
• H2 Database (in-memory)
• GraphQL Query Language

• Java 21 or higher installed
• Maven installed

1. Clone the Repository

git clone https://github.com/athrocks/GraphQL-SpringBoot.git
cd GraphQL-SpringBoot

2. Run the Application

./mvnw spring-boot:run

Or if you use Maven installed globally:

mvn spring-boot:run

3. Access GraphQL Playground

Visit:

http://localhost:8009/graphql

(Or your configured GraphQL client.)

mutation {
  createBook(book: {
    title: "Java Techie",
    desc: "Java Learn",
    price: 453,
    pages: 1245,
    author: "Atharva"
  }) {
    id
  }
}

query {
  allBooks {
    id
    title
    price
  }
}

query {
  getBook(bookId: 2) {
    title
    desc
  }
}

spring.application.name=
server.port=8009

spring.h2.console.enabled=true
spring.datasource.url=jdbc:h2:mem:testdb
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=
spring.datasource.password=

spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
spring.jpa.hibernate.ddl-auto=update
spring.jpa.show-sql=true

• Access H2 console at http://localhost:8009/h2-console
• JDBC URL: jdbc:h2:mem:testdb

type Mutation {
  createBook(book: BookInput): Book
}

type Query {
  allBooks: [Book]
  getBook(bookId: Int): Book
}

type Book {
  id: ID!
  title: String
  desc: String
  author: String
  price: Float
  pages: Int
}

input BookInput {
  title: String
  desc: String
  author: String
  price: Float
  pages: Int
}