Spring Security Third Edition Secure Your Web Applications Restful Services And Microservice Architectures Today

Sure, you removed HttpSession and added JWT tokens. But did you accidentally reintroduce state via your database? Every time you query a token_blacklist table or hit Redis to validate a session-like JWT, you’ve created state – and with it, scalability bottlenecks.

// Simplified from Chapter 11 JwtAuthenticationToken token = ...; Set<String> allowedScopes = getScopesForCurrentService(); Jwt trimmedJwt = JwtHelper.trimScopes(token.getToken(), allowedScopes); This way, payment-service never sees scopes like profile:write – reducing lateral movement risk if compromised. The third edition isn’t about adding more filters. It’s about understanding where authorization actually happens – at the method level, between services, and even inside SQL queries (using Spring Data’s @PostFilter sparingly, as the book warns). Sure, you removed HttpSession and added JWT tokens

Let’s explore three counterintuitive lessons from the book that will change how you think about securing modern applications. The book opens with a provocative claim: Most developers misuse stateless authentication. // Simplified from Chapter 11 JwtAuthenticationToken token =

@Service public class DocumentService { public Document findById(Long id) { // No security here! return documentRepository.findById(id); } } If any other service calls findById(1) – maybe from a scheduled job, a message listener, or another microservice – the authorization check is gone. Let’s explore three counterintuitive lessons from the book

Consider this common pattern: