What is your experience in implementing user authorization and authentication systems?

In Java projects, I implemented authentication and authorization systems using Spring Security. I usually used JWT (JSON Web Tokens) for user authentication, which allows securely transmitting user information between the client and server.

Here's an example of a simple Spring Security configuration class:

@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
            .csrf().disable()
            .authorizeRequests()
            .antMatchers("/login", "/register").permitAll()
            .anyRequest().authenticated()
            .and()
            .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS);
        // Adding a filter to check JWT
        http.addFilterBefore(jwtFilter(), UsernamePasswordAuthenticationFilter.class);
    }

    // Other methods for authentication and token generation
}

I also stored users in a database with password hashing (for example, using BCryptPasswordEncoder). It's important to distinguish between authentication (identity verification) and authorization (access rights verification).