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在Spring Boot 2.6.0版本，启动报错PatternsRequestCondition.getPatterns()空指针，原因详见springfox的issues ，扩展 URL Matching with PathPattern in Spring MVC 。该版本Spring boot的 Release-Notes

导致报错的原因是：

  • 在SpringMVC的5.3.x系列版本（Spring Boot 2.6.x），引入新的URL Matching方式PathPattern。之前已有的是AntPathMatcher。
  • 在Spring Boot 2.6.0版本，将默认的调整为PathPattern。并提供配置 spring.mvc.pathmatch.matching-strategy=ant_path_matcher 可以切换回AntPathMatcher，但是The actuator endpoints now also use PathPattern based URL matching. Note that the path matching strategy for actuator endpoints is not configurable via a configuration property.
  • 导致报错的就是webEndpointServletHandlerMapping方法的/actuator/health/**、/actuator/health、/actuator这几个方法。所以在找到让springfox忽略（不处理）这几个方法的方案前。还未找到好的解决方案，过滤方式详见方法三
  • 暂通过改源码解决，期待后续方案。📦后的jar详见ex-lib目录。git commit
  • 调整源码修改方式，ex-lib中jar为该方式。详见：git commit
  • 生活总是充满惊喜。上面说了，导致问题的原因是/actuator/**，这些是actuator模块的，项目并未显式的引用，所以为神马会有这几个path？ 🤪答案就是redisson。排除掉就可以了，至少只要不需要这些功能，不用改源码
  • 第三种修复方式更为推荐。具体为将springfox中springfox.documentation.spring.web.plugins包下的WebMvcRequestHandlerProvider.java拷贝到项目下(包路径不要变)，进行修改，主体为过滤掉PatternsRequestCondition为null的handlerMappings。详见：git commit , 扩展
  • 第四种修复方式更好一些。通过实现BeanPostProcessor，在bean初始化前后插入一些操作。详见：git commit , 出处
  • 一直有新的修复方式加入，针对问题的不同切入点
  • 之前一直没看懂，但最先接触到的下面这种定义 WebMvcEndpointHandlerMapping Bean的方式就是一种解决方案，具体细节还没搞懂，但跟上面这些是不同的方式，上面都是在处理前exclude the /actuator 系列，这种方式是为其设置了patternsCondition (在构造WebMvcEndpointHandlerMapping时，不传pathPatternParser或传null，就会有以上结果)

⌚️马上🕑了。天亮再继续。考虑从springfox迁移到springdoc了

spring-projects/spring-boot#24645

spring-projects/spring-boot#24805

spring-projects/spring-boot#21694

spring-projects/spring-framework#24952

https://stackoverflow.com/questions/69108273/spring-boot-swagger-documentation-doesnt-work/69814964

springfox/springfox#3462

If one insists on continuing to use Springfox with Spring Boot >= 2.6, one can try to force use of Ant Path Matching by setting

spring.mvc.pathmatch.matching-strategy=ant_path_matcher

Forcing Ant Path Matching on the actuators is a separate problem. It works by injecting the WebMvcEndpointHandlerMapping that was auto-configured before the change by WebMvcEndpointManagementContextConfiguration:

@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 = shouldRegisterLinksMapping(webEndpointProperties, environment, basePath);
  return new WebMvcEndpointHandlerMapping(endpointMapping, webEndpoints, endpointMediaTypes,
      corsProperties.toCorsConfiguration(), new EndpointLinksResolver(allEndpoints, basePath),
      shouldRegisterLinksMapping);
}

private boolean shouldRegisterLinksMapping(WebEndpointProperties webEndpointProperties, Environment environment,
    String basePath) {
  return webEndpointProperties.getDiscovery().isEnabled() && (StringUtils.hasText(basePath)
      || ManagementPortType.get(environment).equals(ManagementPortType.DIFFERENT));
}

There may be a cleverer way by excluding the actuators from being analyzed by Springfox in the first place.

You're mileage may vary. Switching to springdoc is probably the more worthwhile approach.