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

目录

• 解决报错Failed to start bean ‘documentationPluginsBootstrapper’; nested exception is java.lang.NullPointerException
• • 报错信息
  • 报错原因
  • 解决办法
  • • 方法一：springboot版本回退到2.5.X；
    • 方法二：application.yml配置文件配置路径如下

报错信息

org.springframework.context.ApplicationContextException: Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerExceptionat org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:181) ~[spring-context-5.3.24.jar:5.3.24]at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:54) ~[spring-context-5.3.24.jar:5.3.24]at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:356) ~[spring-context-5.3.24.jar:5.3.24]at java.lang.Iterable.forEach(Iterable.java:75) ~[na:1.8.0_333]at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:155) ~[spring-context-5.3.24.jar:5.3.24]at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:123) ~[spring-context-5.3.24.jar:5.3.24]at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:935) ~[spring-context-5.3.24.jar:5.3.24]at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:586) ~[spring-context-5.3.24.jar:5.3.24]at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:147) ~[spring-boot-2.7.7.jar:2.7.7]at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:731) [spring-boot-2.7.7.jar:2.7.7]at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:408) [spring-boot-2.7.7.jar:2.7.7]at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) [spring-boot-2.7.7.jar:2.7.7]at org.springframework.boot.SpringApplication.run(SpringApplication.java:1303) [spring-boot-2.7.7.jar:2.7.7]at org.springframework.boot.SpringApplication.run(SpringApplication.java:1292) [spring-boot-2.7.7.jar:2.7.7]at com.bjsxt.swagger.SwaggerApplication.main(SwaggerApplication.java:16) [classes/:na]Caused by: java.lang.NullPointerException: nullat springfox.documentation.spi.service.contexts.Orderings$8.compare(Orderings.java:112) ~[springfox-spi-2.9.2.jar:null]at springfox.documentation.spi.service.contexts.Orderings$8.compare(Orderings.java:109) ~[springfox-spi-2.9.2.jar:null]at com.google.common.collect.ComparatorOrdering.compare(ComparatorOrdering.java:37) ~[guava-20.0.jar:na]at java.util.TimSort.countRunAndMakeAscending(TimSort.java:355) ~[na:1.8.0_333]at java.util.TimSort.sort(TimSort.java:220) ~[na:1.8.0_333]at java.util.Arrays.sort(Arrays.java:1438) ~[na:1.8.0_333]at com.google.common.collect.Ordering.sortedCopy(Ordering.java:855) ~[guava-20.0.jar:na]at springfox.documentation.spring.web.plugins.WebMvcRequestHandlerProvider.requestHandlers(WebMvcRequestHandlerProvider.java:57) ~[springfox-spring-web-2.9.2.jar:null]at springfox.documentation.spring.web.plugins.DocumentationPluginsBootstrapper$2.apply(DocumentationPluginsBootstrapper.java:138) ~[springfox-spring-web-2.9.2.jar:null]at springfox.documentation.spring.web.plugins.DocumentationPluginsBootstrapper$2.apply(DocumentationPluginsBootstrapper.java:135) ~[springfox-spring-web-2.9.2.jar:null]at com.google.common.collect.Iterators$7.transform(Iterators.java:750) ~[guava-20.0.jar:na]at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:47) ~[guava-20.0.jar:na]at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:47) ~[guava-20.0.jar:na]at com.google.common.collect.MultitransformedIterator.hasNext(MultitransformedIterator.java:52) ~[guava-20.0.jar:na]at com.google.common.collect.MultitransformedIterator.hasNext(MultitransformedIterator.java:50) ~[guava-20.0.jar:na]at com.google.common.collect.ImmutableList.copyOf(ImmutableList.java:249) ~[guava-20.0.jar:na]at com.google.common.collect.ImmutableList.copyOf(ImmutableList.java:209) ~[guava-20.0.jar:na]at com.google.common.collect.FluentIterable.toList(FluentIterable.java:614) ~[guava-20.0.jar:na]at springfox.documentation.spring.web.plugins.DocumentationPluginsBootstrapper.defaultContextBuilder(DocumentationPluginsBootstrapper.java:111) ~[springfox-spring-web-2.9.2.jar:null]at springfox.documentation.spring.web.plugins.DocumentationPluginsBootstrapper.buildContext(DocumentationPluginsBootstrapper.java:96) ~[springfox-spring-web-2.9.2.jar:null]at springfox.documentation.spring.web.plugins.DocumentationPluginsBootstrapper.start(DocumentationPluginsBootstrapper.java:167) ~[springfox-spring-web-2.9.2.jar:null]at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:178) ~[spring-context-5.3.24.jar:5.3.24]... 14 common frames omitted

报错原因

错误原因是：
Springfox使用的路径匹配是基于AntPathMatcher的，而Spring Boot 2.6.X使用的是PathPatternMatcher。

原因是在springboot2.6.0中将SpringMVC 默认路径匹配策略从AntPathMatcher 更改为PathPatternParser，导致出错，解决办法是切换会原先的AntPathMatche

解决办法

方法一：springboot版本回退到2.5.X；

修改前

修改后

运行成功

方法二：application.yml配置文件配置路径如下

不用修改下面这个

application.yml配置文件配置路径
application.yml

spring:  mvc:    pathmatch:      matching-strategy: ANT_PATH_MATCHER

或者在applicatrion.properties配置文件里添加spring.mvc.pathmatch.matching-strategy= ANT_PATH_MATCHER