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

Try to explicitly define the name for your CheckSession bean and see if that helps... Like this:

@Component("CheckSession")
public class CheckSession extends OncePerRequestFilter implements Filter {
    @Autowired private Usuario usuario;

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

        //  always null
        System.out.println("autowired " + usuario);
        chain.doFilter(request,  response);
    }
}

The key part is this: @Component("CheckSession")

And to make things prettier and easier to deal with down the road, I would camelCase the name and rename it to "checkSession" everywhere (de-capitalize first letter).