webFlux 路由post请求时依赖注入字段报null

有下列代码：

@Autowired
AuthHandler authHandler;

RouterFunction<ServerResponse> doctorRouter =
         RouterFunctions.route()
                .path("/doctors", b1 -> b1
                        .nest(accept(MediaType.APPLICATION_JSON), b2 -> b2
                                .GET("/{id}", request -> ServerResponse.ok()
                                     .body(feignService.getDoctorById(request.headers().header("Authorization").get(0), Integer.valueOf(request.pathVariable("id"))),
                                                String.class)
                                )
                              .POST(authHandler::loginAuthentication)

                        ))
                .build();

当起动spring程序时报authHandler为空

 RouterFunction<ServerResponse> doctorRouter(){
        return RouterFunctions.route()
                .path("/doctors", b1 -> b1
                        .nest(accept(MediaType.APPLICATION_JSON), b2 -> b2
                                .GET("/{id}", request -> ServerResponse.ok()
                                        .body(feignService
                                                .getDoctorById(request.headers().header("Authorization").get(0), Integer.valueOf(request.pathVariable("id"))),
                                                String.class)
                                )
                                .POST(authHandler::loginAuthentication)
                        ))
                .build();

   }