Spring Security in Action, Second Edition

Why Spring Security Matters for Every Java Developer 🔐

Modern Java applications are expected to be secure by default, but real-world security still demands careful design. Spring Security has become the de facto tool for protecting Spring-based applications, and this second edition gives you a practical, code-focused path through its most important capabilities.

Laurențiu Spilcă, an experienced developer and trainer, builds the material around realistic examples and incremental learning. Instead of overwhelming you with theory, the book moves from a simple “Hello, Spring Security” project to production-style authentication, authorization, and API protection.

What You’ll Explore

The book’s progression mirrors the way security requirements grow in real projects:

• Authentication essentials: managing users, encoding passwords, and working with the filter chain that underpins every Spring Security configuration.
• Authorization at multiple levels: restricting endpoints, applying method-level security, and using request matchers to control access with precision.
• CSRF and CORS: understanding and customizing these protections without breaking legitimate browser requests.
• OAuth 2 and OpenID Connect: building authorization servers, resource servers, and clients with the latest standards.
• Reactive security: adapting your security strategy for Spring WebFlux and non-blocking applications.
• Testing: writing reliable tests for security configurations so regressions are caught early.

Designed for Practical Work 💻

Each part builds on working code. The author explains not only what to configure, but which design choices make sense in different contexts. You’ll see custom authentication logic, delegated password encoders, and security context handling for synchronous and asynchronous execution.

This focus on practical problem-solving makes the material valuable for developers who need to secure real applications, not just pass a certification.

Updated for Today’s Spring Ecosystem

The second edition reflects current Spring Security practices and API changes. Code examples are written to be run and adapted, allowing you to experiment as you go. While prior Java experience helps, the explanations remain accessible for developers new to security.

Who Will Get the Most from This Edition

• Java developers using Spring Boot or Spring MVC who need to add authentication and authorization.
• Backend engineers building REST APIs that require OAuth 2 or OpenID Connect.
• Team leads and architects reviewing security approaches for new or existing services.
• Anyone tired of cobbling together security from scattered tutorials and ready for a coherent guide.

A Clear Path Through a Complex Topic

What makes this guide stand out is its respect for the reader’s time. The examples are focused, the explanations are concrete, and the progression moves from simple to advanced without losing clarity. If you need to understand Spring Security in depth—from filter basics to OAuth 2 resource servers—this is the book to keep within reach.