原創:idea啟動項目的是否報錯：java.lang.ClassNotFoundException: javax.servlet.ServletContext

在Intellij IDEA中默認所有 scope 為 provided 的依賴不會被加入到 classpath；

想想配置正確，怎么不能創建窗容器呢

ava.lang.ClassNotFoundException: javax.servlet.ServletContext

2020-03-21 17:33:17,156 WARN [org.springframework.context.support.ClassPathXmlApplicationContext] - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mvcContentNegotiationManager': Lookup method resolution failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [org.springframework.web.accept.ContentNegotiationManagerFactoryBean] from ClassLoader [sun.misc.Launcher$AppClassLoader@18b4aac2]
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mvcContentNegotiationManager': Lookup method resolution failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [org.springframework.web.accept.ContentNegotiationManagerFactoryBean] from ClassLoader [sun.misc.Launcher$AppClassLoader@18b4aac2]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.determineCandidateConstructors(AutowiredAnnotationBeanPostProcessor.java:262)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineConstructorsFromBeanPostProcessors(AbstractAutowireCapableBeanFactory.java:1198)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1123)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:502)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:312)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:310)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:742)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:868)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:144)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:85)
    at com.ibaiqi.spider.service.TestDeplication.listRecruits(TestDeplication.java:14)
    at com.ibaiqi.spider.service.TestDeplicationAAA.main(TestDeplicationAAA.java:31)
Caused by: java.lang.IllegalStateException: Failed to introspect Class [org.springframework.web.accept.ContentNegotiationManagerFactoryBean] from ClassLoader [sun.misc.Launcher$AppClassLoader@18b4aac2]
    at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:659)
    at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:556)
    at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:541)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.determineCandidateConstructors(AutowiredAnnotationBeanPostProcessor.java:245)
    ... 15 more
Caused by: java.lang.NoClassDefFoundError: javax/servlet/ServletContext
    at java.lang.Class.getDeclaredMethods0(Native Method)
    at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
    at java.lang.Class.getDeclaredMethods(Class.java:1975)
    at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:641)
    ... 18 more
Caused by: java.lang.ClassNotFoundException: javax.servlet.ServletContext
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 22 more
Disconnected from the target VM, address: '127.0.0.1:52084', transport: 'socket'

Process finished with exit code 1

 

異常詳情：

這是我遇到的異常控制台截圖，如下：

異常解釋：

在Intellij IDEA中默認所有 scope 為 provided 的依賴不會被加入到 classpath；

所以在編譯器啟動 spring boot 項目時，會由於某些依賴加載不到而報 javax.servlet.ServletContext 異常。
解決辦法：

方法一、 修改【IDEA】- Edit Configurations 的配置項：

步驟1：菜單欄 -> Run -> Edit Configurations

步驟2：Run/Debug Configurations -> Application -> Configuration -> 勾選：include dependencies with "Provided" scope

 

方法二、修改【pom.xml 】文件中的配置：

步驟1：找到圖片中的 “spring-boot-starter-tomcat” 標簽，有三種方式可以嘗試；

    將 <scope>provided</scope> 注釋掉 ；
    <scope> 標簽內容provided改成compile：<scope>compile</scope> ；
    <scope>標簽內寫明具體版本，如：<version>1.5.2.RELEASE</version>；

步驟2：這是關於容器的配置，需要把容器tomcat重新加載一下。
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版權聲明：本文為CSDN博主「田瀟文」的原創文章，遵循CC 4.0 BY-SA版權協議，轉載請附上原文出處鏈接及本聲明。
原文鏈接：https://blog.csdn.net/weixin_44259720/article/details/94602764