GraphQL on Java: A Complete Guide to Modern APIs

In modern web development, GraphQL has become the standard for creating flexible and high-performance APIs. The book "GraphQL on Java" is a practical guide that will help Java developers master this technology from scratch and learn to apply it in real-world projects.

What is this book about?

This book covers the full lifecycle of working with GraphQL on Java: from basic concepts to production deployment. You will learn how GraphQL differs from REST, what advantages it offers, and how to properly design data schemas.

What will you learn?

• GraphQL basics: types, queries, mutations, and subscriptions.
• Setting up a GraphQL server on Java using Spring Boot and graphql-java.
• Schema design: scalar types, objects, interfaces, union types, and enums.
• Query processing: DataLoader, caching, and N+1 query optimization.
• Security: authentication, authorization, and attack protection.
• Integration with databases (JPA, Hibernate) and external APIs.
• Subscriptions for real-time interaction via WebSocket.
• Testing GraphQL endpoints and writing integration tests.

Who is this book for?

This book will be useful for:

• Java developers who want to learn GraphQL and apply it in their projects.
• Backend engineers working with Spring Boot and REST API who want to transition to a more flexible architecture.
• Architects looking for effective ways to build APIs for microservices.
• Students and beginner programmers familiar with the basics of Java and web development.

Why should you read it?

The book contains no dry theory — each section is accompanied by practical examples ready to use in your projects. You will learn not just to write code, but to design scalable, secure, and high-performance APIs. The author shares real-world cases from development experience, helps avoid common mistakes, and provides optimization tips.

After reading the book, you will be able to independently implement GraphQL in an existing Java project, create new services from scratch, and confidently discuss architectural decisions with colleagues.

This book is your practical guide to the world of modern APIs on Java. Discover GraphQL and make your applications flexible, fast, and convenient for clients.