GraphQL in Java: Building Modern APIs

The book "GraphQL на Java" is a comprehensive practical guide for developers who want to master a modern approach to building APIs. Unlike REST, GraphQL allows clients to request only the data they actually need, which significantly improves performance and flexibility in frontend-backend interaction.

Who is this book for?

• Java developers familiar with the basics of the language and Spring Framework
• Backend engineers looking to migrate from REST to a more modern protocol
• Architects seeking efficient ways to build APIs for complex systems
• Students and junior specialists wanting to learn an in-demand technology

What will you learn from this book?

• GraphQL Basics: types, schemas, queries, mutations, and subscriptions
• Java Integration: setting up a project with Spring Boot and graphql-java
• Schema Design: creating efficient types and data relationships
• Query Handling: implementing resolvers, DataLoader, and solving the N+1 problem
• Security: authentication, authorization, protection against injection and DoS attacks
• Optimization: pagination, caching, batch data loading
• Testing: unit and integration tests for GraphQL endpoints
• Advanced Topics: federation, subscriptions via WebSocket, monitoring tools

Why should you read this book?

The author shares real-world experience implementing GraphQL in large projects. The book contains numerous code examples ready for use in a production environment. You won't just learn theory — you will learn how to build scalable, secure, and high-performance APIs that are easy to maintain and evolve.

Special attention is given to comparing with REST and migrating existing REST services to GraphQL. You will learn when GraphQL is truly justified and in which cases it is better to stick with REST. Each chapter concludes with practical exercises to reinforce the material.

The book is suitable both for self-study and for use as a reference when developing real projects. After reading it, you will be able to confidently design and implement GraphQL services in Java of any complexity.