Configuring RequestContextListener in SpringBoot

Question

I have a Spring-Boot application which uses Spring-Security. I have a request scoped bean that I want to autowire into one of my custom Filters in the security filter chain, but at the moment it is not working.

I understand that some config is needed to use request scoped beans outside of the DispatcherServlet, and have read this http://docs.spring.io/spring/docs/4.0.x/spring-framework-reference/html/beans.html#beans-factory-scopes-other But have not had any success yet:

For Servlet 3.0+, this can done programmatically via the WebApplicationInitializer interface.

(I am using latest Tomcat so is servlet 3+)

I have tried using both the RequestContextListener and the RequestContextFilter (docs say that they, and the DispatcherServlet, do the exact same thing), but in both cases I still get errors because my autowired object is null:

My attempt to register the Filter

@Configuration
@ComponentScan
@EnableAutoConfiguration
class Application extends SpringBootServletInitializer  {

    @Override protected SpringApplicationBuilder configure( SpringApplicationBuilder application ) {
        application.sources( Application )
    }

    @Override public void onStartup( ServletContext servletContext ) throws ServletException {
        super.onStartup( servletContext )
        servletContext.addFilter("requestContextFilter", new RequestContextFilter() ).addMappingForUrlPatterns(null, false, "/*")
    }

My attempt to register the Listener

@Configuration
@ComponentScan
@EnableAutoConfiguration
class Application extends SpringBootServletInitializer  {

    @Override protected SpringApplicationBuilder configure( SpringApplicationBuilder application ) {
        application.sources( Application )
    }

    @Override public void onStartup( ServletContext servletContext ) throws ServletException {
        super.onStartup( servletContext )
        servletContext.addListener( new RequestContextListener() ) 
    }

Am I missing something obvious? I have had a look at the auto config source code for Spring Boot and haven't come across anything yet.

---

UPDATE

I was being an idiot, I had added my Filter in my SpringSecurity configuration, inside the configure() method:

http.addFilterBefore( new PreAuthFilter(), BasicAuthenticationFilter )

but hadn't registered the new Filter as a Bean. As per M. Denium's comment below, I didn't need all that additional config explicitly adding the listener/filter, just registering the bean was enough.