Springboot 启动出错如下：

Exception in thread "main" java.lang.NoSuchMethodError: org.springframework.util.Assert.isInstanceOf(Ljava/lang/Class;Ljava/lang/Object;Ljava/util/function/Supplier;)Vat org.springframework.boot.logging.logback.LogbackLoggingSystem.getLoggerContext(LogbackLoggingSystem.java:294)at org.springframework.boot.logging.logback.LogbackLoggingSystem.beforeInitialize(LogbackLoggingSystem.java:118)at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationStartingEvent(LoggingApplicationListener.java:232)at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationEvent(LoggingApplicationListener.java:213)at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:98)at org.springframework.boot.context.event.EventPublishingRunListener.starting(EventPublishingRunListener.java:79)at org.springframework.boot.SpringApplicationRunListeners.lambda$starting$0(SpringApplicationRunListeners.java:56)at java.util.ArrayList.forEach(ArrayList.java:1249)at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:120)at org.springframework.boot.SpringApplicationRunListeners.starting(SpringApplicationRunListeners.java:56)at org.springframework.boot.SpringApplication.run(SpringApplication.java:294)at org.springframework.boot.SpringApplication.run(SpringApplication.java:1312)at org.springframework.boot.SpringApplication.run(SpringApplication.java:1301)at com.wms.WmsApplication.main(WmsApplication.java:10)

配置文件放入<dependency>
            <groupId>com.spring4all</groupId>
            <artifactId>swagger-spring-boot-starter</artifactId>
            <version>1.7.1.RELEASE</version>
        </dependency>

查找版本时候在   文件 project  structure  中找到libraries    +   from  maven ,查询

swagger-spring-boot-starter:1.7.1.RELEASE

就会出现很多版本，选择适合自己的，忘记了，我点击了下载，然后又配置了pom.xml文件。所以maven 里面自动下载了，但是在开发项目左边的project 下的External Libraries下边也下载了一个 scom.spring4all:wagger-spring-boot-starter:1.7.1.RELEASE

这样就重复了

只需要把project 下的External Libraries 的 project 下的

scom.spring4all:wagger-spring-boot-starter:1.7.1.RELEASE

删除即可，只需要保留maven中的scom.spring4all:wagger-spring-boot-starter:1.7.1.RELEASE

即可