Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerException: Cannot invoke ...

springboot整合swagger2报错

错误如下：

Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerException: Cannot invoke "org.springframework.web.servlet.mvc.condition.PatternsRequestCondition.toString()" because the return value of "springfox.documentation.spi.service.contexts.Orderings.patternsCondition(springfox.documentation.RequestHandler)" is null

原因：
因为在springboot2.6之后，将springmvc的默认匹配策略修改为了PathPatternParser，需要将其修改为AntPathMatcher就可以解决问题
解决方式：

在yml或者properties文件中添加配置（这里是yml配置）
spring:
  mvc:
    pathmatch:
      matching-strategy: ant_path_matcher
就可以了