GraphQL on Java: A Practical Guide to Building Modern APIs

The book "GraphQL on Java" is a comprehensive guide to creating modern, flexible, and high-performance APIs using the Java language and Spring ecosystem technologies. Unlike traditional REST services, GraphQL allows clients to request only the necessary data, which significantly reduces the amount of transmitted information and speeds up application performance.

Who is this book for?

• Java developers with 1+ years of experience who want to master a modern approach to building APIs
• Backend engineers looking to transition from REST to a more efficient architecture
• Team Leads and Architects evaluating the possibility of implementing GraphQL in existing projects
• Students and graduates of Java courses seeking to acquire an in-demand skill

What will you learn?

• GraphQL fundamentals: types, schemas, queries, mutations, and subscriptions
• Designing an efficient data schema considering business requirements
• Integrating GraphQL with Spring Boot and Spring Data JPA
• Working with databases: PostgreSQL, MySQL, MongoDB via GraphQL resolvers
• Performance optimization: batching, data loaders, caching
• Security: authentication, authorization, and protection against N+1 queries
• Testing GraphQL endpoints using JUnit and Postman
• Deploying the finished application on a server

Why choose this book?

• All code examples are ready to run and available for download
• Step-by-step creation of a complete project: from an empty Spring Boot to a production-ready solution
• Real-world cases covered: an online store, a social network, a booking system
• The author is a practicing developer with 8 years of experience in Java and 3 years in GraphQL

The book is built on the principle of "from simple to complex." You will start with basic concepts, and by the end, you will be able to independently design and implement complex GraphQL services. Special attention is paid to pitfalls: error handling, state management, and scaling.

"GraphQL on Java" will become your reliable assistant in mastering one of the most in-demand technologies in modern web development. Whether you are creating microservices for a startup or maintaining a corporate system, this book will give you the tools to build truly flexible and efficient APIs.