没有加注解@Bean

@Bean
	public ServletListenerRegistrationBean<SecondFilter> getServletListenerRegistrationBean(){
		ServletListenerRegistrationBean<SecondFilter> bean = new ServletListenerRegistrationBean<>(new SecondFilter());
		return bean; 
	}

@Bean
	public ServletRegistrationBean getServletRegistrationBean() {
		ServletRegistrationBean bean = new ServletRegistrationBean(new Servlet2());
		bean.addUrlMappings("/serv2");
		return bean;
	}
	
	@Bean
	public FilterRegistrationBean getFilterRegistrationBean(){
		FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new SecondFilter());
		filterRegistrationBean.addUrlPatterns("/serv2");
		return filterRegistrationBean;
	}