今天在使用SpringBoot創(chuàng)建了一個項目出現(xiàn)如下異常

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'documentationPluginsBootstrapper': Resolution of declared constructors on bean Class [springfox.documentation.spring.web.plugins.DocumentationPluginsBootstrapper] from ClassLoader [sun.misc.Launcher$AppClassLoader@18b4aac2] failed; nested exception is java.lang.NoClassDefFoundError: javax/servlet/ServletContext

at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.determineCandidateConstructors(AutowiredAnnotationBeanPostProcessor.java:281) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineConstructorsFromBeanPostProcessors(AbstractAutowireCapableBeanFactory.java:1204) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1129) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:503) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]

at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]

at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]

at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]

at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]

at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:760) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]

at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:869) ~[spring-context-5.0.7.RELEASE.jar:5.0.7.RELEASE]

at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.0.7.RELEASE.jar:5.0.7.RELEASE]

at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]

at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:395) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]

at org.springframework.boot.SpringApplication.run(SpringApplication.java:327) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]

at org.springframework.boot.SpringApplication.run(SpringApplication.java:1255) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]

at org.springframework.boot.SpringApplication.run(SpringApplication.java:1243) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]

at com.zysh.server.web.ZyshWebApplication.main(ZyshWebApplication.java:12) [classes/:na]

Caused by: java.lang.NoClassDefFoundError: javax/servlet/ServletContext

at java.lang.Class.getDeclaredConstructors0(Native Method) ~[na:1.8.0_162]

at java.lang.Class.privateGetDeclaredConstructors(Class.java:2671) ~[na:1.8.0_162]

at java.lang.Class.getDeclaredConstructors(Class.java:2020) ~[na:1.8.0_162]

at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.determineCandidateConstructors(AutowiredAnnotationBeanPostProcessor.java:276) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]

... 17 common frames omitted

Caused by: java.lang.ClassNotFoundException: javax.servlet.ServletContext

at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_162]

at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_162]

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338) ~[na:1.8.0_162]

at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_162]

上面很多都沒有用只有一條

nested exception is java.lang.NoClassDefFoundError: javax/servlet/ServletContext

這里我交代一下，我不是使用的原版的父，而是自定義的。所以如果你是原版的也不會出現(xiàn)這個問題的。

 這里其實很簡單就是找不到這個類。我回頭又看了下，其實不是找不到

這里一般常用的方法就是將pom.xml文件中的如下這個坐標的scope改為  runtime 就好

<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-tomcat</artifactId>
	<scope>provided</scope>
</dependency>

就像這樣，這樣我的程序就運行成功了。但是只是這樣的話也沒有必要記錄了。 

 你點開你的pom文件中的【spring-boot-starter-web】你會清晰的看到這里已經(jīng)引入了啊

所以你在pom文件中書寫的tomcat的坐標完全就是多余的嘛，很簡單刪除這個坐標就好。 

看不用修改scope了，程序完美運行。還有就是如果你要打war包的話，還需要將這個

【spring-boot-starter-tomcat】這個包給排除掉，為了以后少點麻煩這里還是不要改scope了直接刪除就好。

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