解决报错 Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerException

Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerException 

使用springboot2.6.0后，配置swagger，不论是2.9.2还是3.0.0都报错

解决方法：配置文件中加入 application.yml 

spring:

mvc:
  pathmatch:
    matching-strategy: ant_path_matcher