Original: idea to start the project whether the error: java.lang.ClassNotFoundException: javax.servlet.ServletContext

By default, all in scope as dependent Intellij IDEA will not be provided to the CLASSPATH added;

Think configured correctly, how it can not create a window container

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

 

Abnormal details:

This is a screenshot of my encounter abnormal console, as follows:

anomaly interpretation:

The default scope is provided for all the dependencies are not added to the classpath in Intellij IDEA;

so when the compiler starts spring boot project, due to a these loads can not rely on newspaper and javax.servlet.ServletContext exception.
Solution:

Method One, modify [IDEA] - Edit Configurations configuration items:

Step 1: Menu bar -> Run -> Edit Configurations

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

 

second method, modified] [pom.xml configuration file:

step 1: find the picture of "spring-boot-starter-tomcat " label, there are three ways you can try;

    the <scope> provided </ scope > Comment out;
    <scope> tag into content provided compile: <scope> compile </ scope>;
    specify the specific version of the <scope> >

; Step 2: This is the configuration on the container, the container tomcat need to reload it.
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Disclaimer: This article is the original article CSDN bloggers "Tian Xiaowen", and follow CC 4.0 BY-SA copyright agreement, reproduced, please attach the original source link and this statement.
Original link: https: //blog.csdn.net/weixin_44259720/article/details/94602764