Configuring client certificate authentication using Spring beans

Earlier in this chapter, we reviewed the flow of the classes involved in client certificate authentication. As such, it should be straightforward for us to configure the JBCP calendar using explicit beans. By using the explicit configuration, we will have additional configuration options at our disposal. Let's take a look and see how to use explicit configuration:

    //src/main/java/com/packtpub/springsecurity/configuration/SecurityConfig.java

    @Bean
    public X509AuthenticationFilter x509Filter(AuthenticationManager  
    authenticationManager){
       return new X509AuthenticationFilter(){{
           setAuthenticationManager(authenticationManager);
       }};
    }
   @Bean
    public PreAuthenticatedAuthenticationProvider    
    preauthAuthenticationProvider(AuthenticationUserDetailsService   
    authenticationUserDetailsService...