code: @ConditionalOnExpression("'${joinfaces.primefaces.uploader}' != 'commons'")
  	@Bean
  	public ServletContextInitializer primefacesFileUploadServletContextInitializer(MultipartConfigElement multipartConfigElement) {
  		return servletContext -> {
  			ServletRegistration servletRegistration = servletContext.getServletRegistration(FACES_SERVLET_NAME);
  			if (servletRegistration instanceof ServletRegistration.Dynamic) {
  				((ServletRegistration.Dynamic) servletRegistration).setMultipartConfig(multipartConfigElement);
  			}
  		};
  	}
docs: PrimefacesFileUploadServletContextInitializer for native uploader,
  since {@link FileUploadFilter} suffices for commons file uploader.
  
  @param multipartConfigElement {@link MultipartAutoConfiguration#multipartConfigElement()}
  @return primefaces file upload servlet context initializer