当你的spring-boot版本是2.6.x并且你的swagger版本是3.0.0以上的时候，项目启动会报错“org.springframework.context.ApplicationContextException: Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerException”
解决办法
步骤一、
添加配置
spring: mvc: pathmatch: matching-strategy: ant_path_matcher步骤二、
添加配置类
import org.springframework.beans.BeansException;import org.springframework.beans.factory.config.BeanPostProcessor;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.util.ReflectionUtils;import org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping;import springfox.documentation.spring.web.plugins.WebFluxRequestHandlerProvider;import springfox.documentation.spring.web.plugins.WebMvcRequestHandlerProvider;import java.lang.reflect.Field;import java.util.List;import java.util.stream.Collectors;@Configurationpublic class BeanPostProcessorConfig { @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 void customizeSpringfoxHandlerMappings(List mappings) { List copy = mappings.stream() .filter(mapping -> mapping.getPatternParser() == null) .collect(Collectors.toList()); mappings.clear(); mappings.addAll(copy); } @SuppressWarnings("unchecked") private List getHandlerMappings(Object bean) { try { Field field = ReflectionUtils.findField(bean.getClass(), "handlerMappings"); field.setAccessible(true); return (List) field.get(bean); } catch (IllegalArgumentException | IllegalAccessException e) { throw new IllegalStateException(e); } } }; }} 
