How can I have list of all users logged in (via spring security) my web application

Question

I\'m using spring security in my web application, and now I want to have a list of all users who are logged in my program.

How can I have access to that list? Aren\'

Answer 1

In JavaConfig, it would look like this:

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(final HttpSecurity http) throws Exception {
        // ...
        http.sessionManagement().maximumSessions(1).sessionRegistry(sessionRegistry());
    }

    @Bean
    public SessionRegistry sessionRegistry() {
        return new SessionRegistryImpl();
    }

    @Bean
    public ServletListenerRegistrationBean httpSessionEventPublisher() {
        return new ServletListenerRegistrationBean(new HttpSessionEventPublisher());
    }
}

With the calling code looking like this:

public class UserController {
    @Autowired
    private SessionRegistry sessionRegistry;

    public void listLoggedInUsers() {
        final List