问题描述：

spring-boot-starter 2.6.7 + spring-cloud-starter-security + knife4j。启动报错：

java.lang.IllegalStateException: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@de18f63 has not been refreshed yet
...
org.springframework.context.ApplicationContextException: Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerException
...
Unexpected error occurred in scheduled task

配置文件配置matching-strategy后，仍然无效果，还是启动不起来。

  mvc:
    pathmatch:
      matching-strategy: ant_path_matcher

解决方案：

配置matching-strategy的解决方案，在没有spring-boot-starter-actuator的时候大部分是可以解决的。如果还是报错，可以增加以下配置

@Bean
	public static BeanPostProcessor springfoxHandlerProviderBeanPostProcessor() {
	    return new BeanPostProcessor() {
	
	        @Override
	        public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
	            if (bean instanceof WebMvcRequestHandlerProvider || bean instanceof WebFluxRequestHandlerProvider) {
	                customizeSpringfoxHandlerMappings(getHandlerMappings(bean));
	            }
	            return bean;
	        }
	
	        private <T extends RequestMappingInfoHandlerMapping> void customizeSpringfoxHandlerMappings(List<T> mappings) {
	            mappings.removeIf(mapping -> mapping.getPatternParser() != null);
	        }
	
	        @SuppressWarnings("unchecked")
	        private List<RequestMappingInfoHandlerMapping> getHandlerMappings(Object bean) {
	            try {
	                Field field = ReflectionUtils.findField(bean.getClass(), "handlerMappings");
	                field.setAccessible(true);
	                return (List<RequestMappingInfoHandlerMapping>) field.get(bean);
	            } catch (IllegalArgumentException | IllegalAccessException e) {
	                throw new IllegalStateException(e);
	            }
	        }
	    };
	}

参考资料：
SpringBoot2.6,在有spring-boot-starter-actuator依赖的情况下报错，2.5.7正常启动

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