Mastering Secure Authentication with Spring Security 6.4

for free reading -> https://master-spring-ter.medium.com/mastering-secure-authentication-with-spring-security-6-4-generated-by-deepseek-8759eca6bacf?sk=96f768dbbe023b244194db974b896b44

Spring Security 6.4 continues to set the standard for securing Java applications, offering modern solutions for authentication, authorization, and protection against vulnerabilities. In this article, we’ll explore its latest features and demonstrate how to implement one-time tokens (OTTs) securely, addressing common pitfalls and best practices.

Part 1: What’s New in Spring Security 6.4?

1. OAuth2 Authorization Server

Spring Security 6.4 simplifies building your own OAuth2 authorization server. Unlike earlier versions, the configuration now uses OAuth2AuthorizationServerConfigurer:

@Configuration  
@EnableWebSecurity  
public class OAuth2ServerConfig {  
    @Bean  
    public SecurityFilterChain authServerFilterChain(HttpSecurity http) throws Exception {  
        OAuth2AuthorizationServerConfigurer authServer = new OAuth2AuthorizationServerConfigurer();  
        http  
            .with(authServer, Customizer.withDefaults()) // Applies OAuth2 endpoints  
            .oauth2ResourceServer(oauth2 -> oauth2.jwt(Customizer.withDefaults()))  
            .formLogin(Customizer.withDefaults());  
        return http.build();  
    }  
}  

Key Benefits:

• Built-in support for token…