javax.servlet.ServletException：java.lang.NoClassDefFoundError：javax / servlet / jsp / jstl / core / ConditionalTagSupport

25-03-11 7

想了解javax.servlet.ServletException：java.lang.NoClassDefFoundError：javax/servlet/jsp/jstl/core/Conditi

想了解javax.servlet.ServletException：java.lang.NoClassDefFoundError：javax / servlet / jsp / jstl / core / ConditionalTagSupport的新动态吗？本文将为您提供详细的信息，此外，我们还将为您介绍关于Caused by: java.lang.NoClassDefFoundError: javax/servlet/ServletContext、Caused by: java.lang.NoClassDefFoundError: Ljavax/servlet/http/HttpServletRequest;、Error:(12, 8) java: 无法访问javax.servlet.ServletException 找不到javax.servlet.ServletException的类文件、HTTP Status 500 - javax.servlet.ServletException: java.lang.NoClassDefFoundError: javax/servlet/j...的新知识。

本文目录一览：

javax.servlet.ServletException：java.lang.NoClassDefFoundError：javax / servlet / jsp / jstl / core / ConditionalTagSupport
Caused by: java.lang.NoClassDefFoundError: javax/servlet/ServletContext
Caused by: java.lang.NoClassDefFoundError: Ljavax/servlet/http/HttpServletRequest;
Error:(12, 8) java: 无法访问javax.servlet.ServletException 找不到javax.servlet.ServletException的类文件
HTTP Status 500 - javax.servlet.ServletException: java.lang.NoClassDefFoundError: javax/servlet/j...

javax.servlet.ServletException：java.lang.NoClassDefFoundError：javax / servlet / jsp / jstl / core / ConditionalTagSupport

我正在使用sitemesh装饰页面。我为此使用了JSP页面。在使用<c:if>条件标签之前，页面工作正常。我在WEB-INF /
lib文件夹中有jstl-impl-1.2.jar和sitemesh-3.0-alpha-1.jar文件。我在jsp页面中有以下标记库声明：

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %><%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %><%@ taglib uri="http://java.sun.com/jsp/jstl/sql" prefix="sql" %>

我在Java 6中使用tomcat
7.0。在eclipse中创建新的动态Web项目时，将动态Web模块版本设置为2.4。该页面具有<c:set/>标签，它们工作正常，但是当我使用if条件标签时，出现以下错误：

javax.servlet.ServletException: java.lang.NoClassDefFoundError: javax/servlet/jsp/jstl/core/ConditionalTagSupportorg.apache.jasper.servlet.JspServlet.service(JspServlet.java:342)javax.servlet.http.HttpServlet.service(HttpServlet.java:722)org.sitemesh.webapp.WebAppContext.dispatch(WebAppContext.java:158)org.sitemesh.webapp.WebAppContext.decorate(WebAppContext.java:133)org.sitemesh.BaseSiteMeshContext.decorate(BaseSiteMeshContext.java:39)org.sitemesh.webapp.SiteMeshFilter.postProcess(SiteMeshFilter.java:74)org.sitemesh.webapp.contentfilter.ContentBufferingFilter.bufferAndPostProcess(ContentBufferingFilter.java:175)org.sitemesh.webapp.contentfilter.ContentBufferingFilter.doFilter(ContentBufferingFilter.java:126)org.sitemesh.config.ConfigurableSiteMeshFilter.doFilter(ConfigurableSiteMeshFilter.java:157)root causejava.lang.NoClassDefFoundError: javax/servlet/jsp/jstl/core/ConditionalTagSupportjava.lang.ClassLoader.defineClass1(Native Method)java.lang.ClassLoader.defineClassCond(Unknown Source)java.lang.ClassLoader.defineClass(Unknown Source)java.security.SecureClassLoader.defineClass(Unknown Source)org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2820)org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1150)org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1645)org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1523)org.apache.jasper.compiler.Parser.parseCustomTag(Parser.java:1223)org.apache.jasper.compiler.Parser.parseElements(Parser.java:1450)org.apache.jasper.compiler.Parser.parse(Parser.java:138)org.apache.jasper.compiler.ParserController.doParse(ParserController.java:242)org.apache.jasper.compiler.ParserController.parse(ParserController.java:102)org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:198)org.apache.jasper.compiler.Compiler.compile(Compiler.java:373)org.apache.jasper.compiler.Compiler.compile(Compiler.java:353)org.apache.jasper.compiler.Compiler.compile(Compiler.java:340)org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:644)org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:358)org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)javax.servlet.http.HttpServlet.service(HttpServlet.java:722)org.sitemesh.webapp.WebAppContext.dispatch(WebAppContext.java:158)org.sitemesh.webapp.WebAppContext.decorate(WebAppContext.java:133)org.sitemesh.BaseSiteMeshContext.decorate(BaseSiteMeshContext.java:39)org.sitemesh.webapp.SiteMeshFilter.postProcess(SiteMeshFilter.java:74)org.sitemesh.webapp.contentfilter.ContentBufferingFilter.bufferAndPostProcess(ContentBufferingFilter.java:175)org.sitemesh.webapp.contentfilter.ContentBufferingFilter.doFilter(ContentBufferingFilter.java:126)org.sitemesh.config.ConfigurableSiteMeshFilter.doFilter(ConfigurableSiteMeshFilter.java:157)root causejava.lang.ClassNotFoundException: javax.servlet.jsp.jstl.core.ConditionalTagSupportorg.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1678)org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1523)java.lang.ClassLoader.defineClass1(Native Method)java.lang.ClassLoader.defineClassCond(Unknown Source)java.lang.ClassLoader.defineClass(Unknown Source)java.security.SecureClassLoader.defineClass(Unknown Source)org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2820)org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1150)org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1645)org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1523)org.apache.jasper.compiler.Parser.parseCustomTag(Parser.java:1223)org.apache.jasper.compiler.Parser.parseElements(Parser.java:1450)org.apache.jasper.compiler.Parser.parse(Parser.java:138)org.apache.jasper.compiler.ParserController.doParse(ParserController.java:242)org.apache.jasper.compiler.ParserController.parse(ParserController.java:102)org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:198)org.apache.jasper.compiler.Compiler.compile(Compiler.java:373)org.apache.jasper.compiler.Compiler.compile(Compiler.java:353)org.apache.jasper.compiler.Compiler.compile(Compiler.java:340)org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:644)org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:358)org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)javax.servlet.http.HttpServlet.service(HttpServlet.java:722)org.sitemesh.webapp.WebAppContext.dispatch(WebAppContext.java:158)org.sitemesh.webapp.WebAppContext.decorate(WebAppContext.java:133)org.sitemesh.BaseSiteMeshContext.decorate(BaseSiteMeshContext.java:39)org.sitemesh.webapp.SiteMeshFilter.postProcess(SiteMeshFilter.java:74)org.sitemesh.webapp.contentfilter.ContentBufferingFilter.bufferAndPostProcess(ContentBufferingFilter.java:175)org.sitemesh.webapp.contentfilter.ContentBufferingFilter.doFilter(ContentBufferingFilter.java:126)org.sitemesh.config.ConfigurableSiteMeshFilter.doFilter(ConfigurableSiteMeshFilter.java:157)

答案1

小编典典

该异常表明运行时类路径中缺少JSTL API。您似乎只有JSTL隐含功能。我建议将其删除，而改用同时包含API和impl
的jstl-1.2.jar。

此外，我还建议您更新web.xml根声明以符合Servlet 3.0规范。JSTL 1.2至少需要Servlet 2.5，因此在以Servlet
2.4为目标的项目中不能很好地工作。由于Tomcat 7是Servlet 3.0容器，而Servlet 3.0提供了超过2.5的许多新功能，因此我将继续。

<web-app     xmlns="http://java.sun.com/xml/ns/javaee"     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"    version="3.0">

不要忘记在项目属性中相应地修复动态Web项目构面版本。

也可以看看：

我们的JSTL Wiki页面

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

org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class [com.linewell.wechat.WechatApplication]; nested exception is java.lang.IllegalStateException: Failed to introspect annotated methods on class org.springframework.boot.web.support.SpringBootServletInitializer
	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:183)
	at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:308)
	at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:228)
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:272)
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:92)
	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:687)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:525)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:303)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107)
	at com.linewell.wechat.WechatApplication.main(WechatApplication.java:21)
Caused by: java.lang.IllegalStateException: Failed to introspect annotated methods on class org.springframework.boot.web.support.SpringBootServletInitializer
	at org.springframework.core.type.StandardAnnotationMetadata.getAnnotatedMethods(StandardAnnotationMetadata.java:163)
	at org.springframework.context.annotation.ConfigurationClassParser.retrieveBeanMethodMetadata(ConfigurationClassParser.java:385)
	at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:319)
	at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:247)
	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:200)
	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:169)
	... 12 common frames omitted
Caused by: java.lang.NoClassDefFoundError: javax/servlet/ServletContext
	at java.lang.Class.getDeclaredMethods0(Native Method)
	at java.lang.Class.privateGetDeclaredMethods(Class.java:2531)
	at java.lang.Class.getDeclaredMethods(Class.java:1855)
	at org.springframework.core.type.StandardAnnotationMetadata.getAnnotatedMethods(StandardAnnotationMetadata.java:152)
	... 17 common frames omitted
Caused by: java.lang.ClassNotFoundException: javax.servlet.ServletContext
	at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
	... 21 common frames omitted
Disconnected from the target VM, address: ''127.0.0.1:52471'', transport: ''socket''

　　spingboot 内置 tomcat，启动时找不到 servlet，查看 jar 是否打包至 classpath 中

<!-- 这里指定打包的时候不再需要tomcat相关的包 -->
<dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-tomcat</artifactId>
     <!--<scope>provided</scope>-->
</dependency>

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

Error:(12, 8) java: 无法访问javax.servlet.ServletException 找不到javax.servlet.ServletException的类文件

这里写图片描述
Error:(12, 8) java: 无法访问javax.servlet.ServletException
找不到javax.servlet.ServletException的类文件

需要添加servlet依赖

<dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>

或者

<dependency>
    <groupId>javax</groupId>
    <artifactId>javaee-api</artifactId>
    <version>7.0</version>
</dependency>

HTTP Status 500 - javax.servlet.ServletException: java.lang.NoClassDefFoundError: javax/servlet/j...

我在项目中导入了 jar，还是不能使用 EL 表达式，一运行就出现了下面的额错误：

org.apache.jasper.JasperException: javax.servlet.ServletException: java.lang.NoClassDefFoundError: javax/servlet/jsp/jstl/core/LoopTag
    org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:549)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:455)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
    org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:170)
    org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:316)
    org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1370)
    org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1116)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1055)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:897)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)

在 Maven 的 pom.xml 中加入下面的依赖：

<dependency>
      <groupId>org.apache.taglibs</groupId>
      <artifactId>taglibs-standard-compat</artifactId>
      <version>1.2.5</version>
    </dependency>
    <dependency>
      <groupId>org.apache.taglibs</groupId>
      <artifactId>taglibs-standard-impl</artifactId>
      <version>1.2.5</version>
    </dependency>
    <dependency>
      <groupId>org.apache.taglibs</groupId>
      <artifactId>taglibs-standard-spec</artifactId>
      <version>1.2.5</version>
    </dependency>
    <dependency>
      <groupId>org.apache.taglibs</groupId>
      <artifactId>taglibs-standard-jstlel</artifactId>
      <version>1.2.5</version>
      <scope>provided</scope>
    </dependency>

就不会报错了

关于javax.servlet.ServletException：java.lang.NoClassDefFoundError：javax / servlet / jsp / jstl / core / ConditionalTagSupport的介绍现已完结，谢谢您的耐心阅读，如果想了解更多关于Caused by: java.lang.NoClassDefFoundError: javax/servlet/ServletContext、Caused by: java.lang.NoClassDefFoundError: Ljavax/servlet/http/HttpServletRequest;、Error:(12, 8) java: 无法访问javax.servlet.ServletException 找不到javax.servlet.ServletException的类文件、HTTP Status 500 - javax.servlet.ServletException: java.lang.NoClassDefFoundError: javax/servlet/j...的相关知识，请在本站寻找。

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