[Swagger] Springboot 2.6.2 + springfox 3.0.0 启动报错的解决方案

概述

# 报错
org.springframework.context.ApplicationContextException: Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerException

环境配置

dependencies {
  ...	
 
 // swagger
 implementation 'io.springfox:springfox-boot-starter:3.0.0'
 }

解决方案

1. yml配置文件增加以下配置

   spring:
   # 解决swagger启动报错documentationPluginsBootstrapper的问题
     mvc:
       pathmatch:
         matching-strategy: ant_path_matcher

2. 修改configuration

   
   @Configuration
   @EnableOpenApi
   public class Swagger3Configuration {
   	
       ...
   
       /* 解决swagger3.0.0(springfox 3.0.0 +Spring boot 2.6.2 报错的问题 ) */
       @Bean
       public WebMvcEndpointHandlerMapping webEndpointServletHandlerMapping(WebEndpointsSupplier webEndpointsSupplier, ServletEndpointsSupplier servletEndpointsSupplier, ControllerEndpointsSupplier controllerEndpointsSupplier, EndpointMediaTypes endpointMediaTypes, CorsEndpointProperties corsProperties, WebEndpointProperties webEndpointProperties, Environment environment) {
           List<ExposableEndpoint<?>> allEndpoints = new ArrayList();
           Collection<ExposableWebEndpoint> webEndpoints = webEndpointsSupplier.getEndpoints();
           allEndpoints.addAll(webEndpoints);
           allEndpoints.addAll(servletEndpointsSupplier.getEndpoints());
           allEndpoints.addAll(controllerEndpointsSupplier.getEndpoints());
           String basePath = webEndpointProperties.getBasePath();
           EndpointMapping endpointMapping = new EndpointMapping(basePath);
           boolean shouldRegisterLinksMapping = this.shouldRegisterLinksMapping(webEndpointProperties, environment, basePath);
           return new WebMvcEndpointHandlerMapping(endpointMapping, webEndpoints, endpointMediaTypes, corsProperties.toCorsConfiguration(), new EndpointLinksResolver(allEndpoints, basePath), shouldRegisterLinksMapping, null);
       }
   
       private boolean shouldRegisterLinksMapping(WebEndpointProperties webEndpointProperties, Environment environment, String basePath) {
           return webEndpointProperties.getDiscovery().isEnabled() && (StringUtils.hasText(basePath) || ManagementPortType.get(environment).equals(ManagementPortType.DIFFERENT));
       }
   }