一、将springboot升级到2.6.x之后启动报如下错误
org.springframework.context.ApplicationContextException: Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerException
at org.springframework.context.support.DefaultLifecycleProcessor.doStart（DefaultLifecycleProcessor.java:181） ——[spring-context-5.3.14.jar:5.3.14]
at org.springframework.context.support.DefaultLifecycleProcessor.access$200（DefaultLifecycleProcessor.java:54） ——[spring-context-5.3.14.jar:5.3.14]
at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start（DefaultLifecycleProcessor.java:356） ——[spring-context-5.3.14.jar:5.3.14]
at java.lang.Iterable.forEach（Iterable.java:75） ——[na:1.8.0_181]
二、解决方案是：springboot2.6.x之后将spring MVC默认路径匹配策略从ANT_PATH_MATCHER模式改为PATH_PATTERN_PARSER模式导致出错，解决方法是切换会原先的ANT_PATH_MATCHER模式
spring.mvc.pathmatch.matching-strategy=ant_path_matcher
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