Spring and @Autowired on a DelegatingFilterProxy

Question

I\'m trying to inject a spring bean into a filter, but can\'t make it work.

The bean injected is always \"null\". I succeed autowiring this same bean in Controllers

Answer 1

Works on Spring 3.2.6:

First: Name your component, 2 options - do only one

Option A: Annotation - assumes component scanning enabled

@Component("checkSession")
public class CheckSession extends OncePerRequestFilter {

@Autowired 
Usuario usuario;

@Override
protected void doFilterInternal(final HttpServletRequest request, final HttpServletResponse response, final FilterChain chain) throws ServletException, IOException {

    // not null
    System.out.println("autowired " + usuario);
    chain.doFilter(request,  response);
    }
}

Option B: wire bean via appliationContext.xml

Second: Wire up Spring DelegatingFilterProxy

  checkSession
  org.springframework.web.filter.DelegatingFilterProxy



  checkSession
  /*

Notes: the bean name is referenced as the filter-name