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异常：java.lang.ClassNotFoundException：运行Servlet时javax.servlet.http.HttpServletRequest

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对于想了解异常：java.lang.ClassNotFoundException：运行Servlet时javax.servlet.http.HttpServletRequest的读者，本文将提供新的信

对于想了解异常：java.lang.ClassNotFoundException：运行Servlet时javax.servlet.http.HttpServletRequest的读者，本文将提供新的信息，并且为您提供关于"javax.servlet.http.HttpServlet" was not found、Caused by: java.lang.NoClassDefFoundError: Ljavax/servlet/http/HttpServletRequest;、eclipse-- The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path、eclipse中的错误解决——The superclass "javax.servlet.http.HttpServlet" was not found on the Jav...的有价值信息。

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异常：java.lang.ClassNotFoundException：运行Servlet时javax.servlet.http.HttpServletRequest

异常：java.lang.ClassNotFoundException：运行Servlet时javax.servlet.http.HttpServletRequest

我正在研究此处概述的简单上载JSP和Servlet教程：

上传教程

我已经对系统进行了编码并且网页已完成，但是运行该应用程序时出现错误。当我点击上传按钮时，例如：

    SEVERE: Servlet.service() for servlet [UploadServlet] in context with path [/Test] threw exception [Servlet execution threw an exception] with root causejava.lang.ClassNotFoundException: javax.servlet.http.HttpServletRequest    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)    at java.security.AccessController.doPrivileged(Native Method)    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)    at org.apache.commons.fileupload.servlet.ServletFileUpload.isMultipartContent(ServletFileUpload.java:68)    at com.dell.UploadServlet.doPost(UploadServlet.java:45)    at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)    at java.lang.Thread.run(Thread.java:724)

我也被定向到的tomcat页面如下所示：

错误图片

有人知道我做错了吗？谢谢

答案1

小编典典

您忘记/错过了添加 apache通用文件上传
jar

 at org.apache.commons.fileupload.servlet.ServletFileUpload.                     isMultipartContent(ServletFileUpload.java:68)

检查您的lib/maven jar结构。

"javax.servlet.http.HttpServlet" was not found

在 eclipse 中，用 maven 新建 web 项目时，jsp 页面报错：

The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path.

说明缺少 httpServlet，解决方法是：

右键项目 - Properties-Targeted Runtimes - 选择自己要运行的服务器，比如 Apache Tomcat v7.0-ok!

据说也可以在 pom.xml 中添加 

<dependency>
	<groupId>javax.servlet</groupId>
	<artifactId>servlet-api</artifactId>
	<version>2.5</version>
</dependency>

Caused by: java.lang.NoClassDefFoundError: Ljavax/servlet/http/HttpServletRequest;

Caused by: java.lang.NoClassDefFoundError: Ljavax/servlet/http/HttpServletRequest;

org.springframework.beans.factory.BeanCreationException: Error creating bean with name ''org.springframework.context.event.internalEventListenerProcessor'': BeanPostProcessor before instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ''org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration'': BeanPostProcessor before instantiation of bean failed; nested exception is java.lang.NoClassDefFoundError: Ljavax/servlet/http/HttpServletRequest;
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:496)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:760)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:869)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:395)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:327)
	at cn.storm.upms.StormUpmsApplication.main(StormUpmsApplication.java:14)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name ''org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration'': BeanPostProcessor before instantiation of bean failed; nested exception is java.lang.NoClassDefFoundError: Ljavax/servlet/http/HttpServletRequest;
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:496)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:368)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1254)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1103)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:541)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:501)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:204)
	at org.springframework.aop.framework.autoproxy.BeanFactoryAdvisorRetrievalHelper.findAdvisorBeans(BeanFactoryAdvisorRetrievalHelper.java:94)
	at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findCandidateAdvisors(AbstractAdvisorAutoProxyCreator.java:109)
	at org.springframework.aop.aspectj.annotation.AnnotationAwareAspectJAutoProxyCreator.findCandidateAdvisors(AnnotationAwareAspectJAutoProxyCreator.java:92)
	at org.springframework.aop.aspectj.autoproxy.AspectJAwareAdvisorAutoProxyCreator.shouldSkip(AspectJAwareAdvisorAutoProxyCreator.java:101)
	at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessBeforeInstantiation(AbstractAutoProxyCreator.java:254)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInstantiation(AbstractAutowireCapableBeanFactory.java:1067)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.resolveBeforeInstantiation(AbstractAutowireCapableBeanFactory.java:1040)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:490)
	... 11 common frames omitted
Caused by: java.lang.NoClassDefFoundError: Ljavax/servlet/http/HttpServletRequest;
	at java.lang.Class.getDeclaredFields0(Native Method)
	at java.lang.Class.privateGetDeclaredFields(Class.java:2583)
	at java.lang.Class.getDeclaredFields(Class.java:1916)
	at org.springframework.aop.aspectj.annotation.AbstractAspectJAdvisorFactory.compiledByAjc(AbstractAspectJAdvisorFactory.java:93)
	at org.springframework.aop.aspectj.annotation.AbstractAspectJAdvisorFactory.isAspect(AbstractAspectJAdvisorFactory.java:78)
	at org.springframework.aop.aspectj.annotation.BeanFactoryAspectJAdvisorsBuilder.buildAspectJAdvisors(BeanFactoryAspectJAdvisorsBuilder.java:104)
	at org.springframework.aop.aspectj.annotation.AnnotationAwareAspectJAutoProxyCreator.findCandidateAdvisors(AnnotationAwareAspectJAutoProxyCreator.java:95)
	at org.springframework.aop.aspectj.autoproxy.AspectJAwareAdvisorAutoProxyCreator.shouldSkip(AspectJAwareAdvisorAutoProxyCreator.java:101)
	at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessBeforeInstantiation(AbstractAutoProxyCreator.java:254)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInstantiation(AbstractAutowireCapableBeanFactory.java:1067)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.resolveBeforeInstantiation(AbstractAutowireCapableBeanFactory.java:1040)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:490)
	... 32 common frames omitted
Caused by: java.lang.ClassNotFoundException: javax.servlet.http.HttpServletRequest
	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)
	... 44 common frames omitted

2019-04-01 09:38:30.370 [main] ERROR org.springframework.boot.SpringApplication - Application run failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name ''org.springframework.context.event.internalEventListenerProcessor'': BeanPostProcessor before instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ''org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration'': BeanPostProcessor before instantiation of bean failed; nested exception is java.lang.NoClassDefFoundError: Ljavax/servlet/http/HttpServletRequest;
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:496)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:760)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:869)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:395)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:327)
	at cn.storm.upms.StormUpmsApplication.main(StormUpmsApplication.java:14)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name ''org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration'': BeanPostProcessor before instantiation of bean failed; nested exception is java.lang.NoClassDefFoundError: Ljavax/servlet/http/HttpServletRequest;
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:496)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:368)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1254)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1103)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:541)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:501)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:204)
	at org.springframework.aop.framework.autoproxy.BeanFactoryAdvisorRetrievalHelper.findAdvisorBeans(BeanFactoryAdvisorRetrievalHelper.java:94)
	at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findCandidateAdvisors(AbstractAdvisorAutoProxyCreator.java:109)
	at org.springframework.aop.aspectj.annotation.AnnotationAwareAspectJAutoProxyCreator.findCandidateAdvisors(AnnotationAwareAspectJAutoProxyCreator.java:92)
	at org.springframework.aop.aspectj.autoproxy.AspectJAwareAdvisorAutoProxyCreator.shouldSkip(AspectJAwareAdvisorAutoProxyCreator.java:101)
	at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessBeforeInstantiation(AbstractAutoProxyCreator.java:254)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInstantiation(AbstractAutowireCapableBeanFactory.java:1067)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.resolveBeforeInstantiation(AbstractAutowireCapableBeanFactory.java:1040)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:490)
	... 11 common frames omitted
Caused by: java.lang.NoClassDefFoundError: Ljavax/servlet/http/HttpServletRequest;
	at java.lang.Class.getDeclaredFields0(Native Method)
	at java.lang.Class.privateGetDeclaredFields(Class.java:2583)
	at java.lang.Class.getDeclaredFields(Class.java:1916)
	at org.springframework.aop.aspectj.annotation.AbstractAspectJAdvisorFactory.compiledByAjc(AbstractAspectJAdvisorFactory.java:93)
	at org.springframework.aop.aspectj.annotation.AbstractAspectJAdvisorFactory.isAspect(AbstractAspectJAdvisorFactory.java:78)
	at org.springframework.aop.aspectj.annotation.BeanFactoryAspectJAdvisorsBuilder.buildAspectJAdvisors(BeanFactoryAspectJAdvisorsBuilder.java:104)
	at org.springframework.aop.aspectj.annotation.AnnotationAwareAspectJAutoProxyCreator.findCandidateAdvisors(AnnotationAwareAspectJAutoProxyCreator.java:95)
	at org.springframework.aop.aspectj.autoproxy.AspectJAwareAdvisorAutoProxyCreator.shouldSkip(AspectJAwareAdvisorAutoProxyCreator.java:101)
	at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessBeforeInstantiation(AbstractAutoProxyCreator.java:254)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInstantiation(AbstractAutowireCapableBeanFactory.java:1067)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.resolveBeforeInstantiation(AbstractAutowireCapableBeanFactory.java:1040)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:490)
	... 32 common frames omitted
Caused by: java.lang.ClassNotFoundException: javax.servlet.http.HttpServletRequest
	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)
	... 44 common frames omitted

　解决办法：

    首先检查是否是jar包冲突，查看是否引入了servelet-api.jar，查一下引入的版本号，也有人说将sevelet-api.jar更换成javax.servelet-api.jar,不过这种情况我没遇到过，大家可以作为解决方案的一种去尝试；

第二种方法，查看maven中是否引入了tomcat的依赖，由于spring-boot 自动集成容器,可能自带容器中的jar包与maven引入的tomcat依赖中的jar包有冲突,直接将其注释掉。

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

　　我就是用第二种方法，注释掉以后可以正常启动了

 

 

eclipse-- The superclass

eclipse-- The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path

遇到错误：
The superclass “javax.servlet.http.HttpServlet” was not found on the **Java Build Path
解决方案：**

这里写图片描述
这里写图片描述
这里写图片描述

这里写图片描述
这里写图片描述

eclipse中的错误解决——The superclass

eclipse中的错误解决——The superclass "javax.servlet.http.HttpServlet" was not found on the Jav...

看看我们遇到的问题

解决问题

 

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