如何在AbstractAnnotationConfigDispatcherServletInitializer中使用DelegatingFilterProxy

Question

我想在AbstractAnnotationConfigDispatcherServletInitializer的onStartup方法中注册DelegatingFilterProxy。不幸的是，servlet初始化时尚未创建DelegatingFilterProxy的委托bean：

@Order(1)
public class MvcWebApplicationInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
    ...
    @Override
    public void onStartup(ServletContext servletContext) throws ServletException {
        super.onStartup(servletContext);
        FilterRegistration.Dynamic localeFilter = servletContext.addFilter("localeFilter", new DelegatingFilterProxy("localeFilter"));
        localeFilter.addMappingForUrlPatterns(null, false, "/*");
    }
    ...
}

@Configuration
@EnableWebMvc
public class WebConfig extends WebMvcConfigurerAdapter {
    ...
    @Bean
    public LocaleFilter localeFilter() {
        return new LocaleFilter();
    }
    ...
}

如何确保在servlet的启动之前创建localeFilter bean？