NoClassDefFoundError: javax/el/ELResolver问题解决

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我是靠谱客的博主秀丽雨，最近开发中收集的这篇文章主要介绍NoClassDefFoundError: javax/el/ELResolver问题解决，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

环境：Tomcat6.0 Eclipse3.4 jdk1.5

    一周前我用的时候还可以运行，期间我在机器上装了一个MyEclipse6.0在MyEclipse中运行struts2的application就出现此错误，之后我把MyEclipse卸载，又重装了Tomcat，启动Eclipse运行软件还是有这个错误

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: javax.servlet.ServletException: java.lang.NoClassDefFoundError: javax/el/ELResolver
   com.neusoft.unieap.service.security.ui.webapp.UniEAPSecurityEnforcementFilter.doFilter(UniEAPSecurityEnforcementFilter.java:174)
   ......
       org.ecside.filter.ECSideFilter.doFilter(ECSideFilter.java:161)
   com.neusoft.unieap.comp.transcoding.TranscodingFilter.doFilter(TranscodingFilter.java:35)

root cause

javax.servlet.ServletException: java.lang.NoClassDefFoundError: javax/el/ELResolver
   org.apache.jasper.servlet.JspServlet.service(JspServlet.java:274)
   javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
   .............

   net.sf.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:303)
   com.neusoft.unieap.service.security.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:263)
   net.sf.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:303)
   net.sf.acegisecurity.util.FilterChainProxy.doFilter(FilterChainProxy.java:173)
   net.sf.acegisecurity.util.FilterToBeanProxy.doFilter(FilterToBeanProxy.java:125)
   org.ecside.filter.ECSideFilter.doFilter(ECSideFilter.java:161)
   com.neusoft.unieap.comp.transcoding.TranscodingFilter.doFilter(TranscodingFilter.java:35)

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.1 logs.

NoClassDefFoundError: javax/el/ELResolver产生此错误的原因有很多种(仅列举我遇到的两种)。

产生此错误

1.首先检查一下Tomcat/lib下是否已经有el-api.jar el-ri.jar两个jar文件，没有则拷贝到此目录下。重启Eclipse测试

2. 如果机器上已经有Eclipse，又安装MyEclipse，MyEclipse会自动查找jre,他首先检测到的是C:/Program Files/Java（jdk安装目录）中的jre，而不是C:/Program Files/Java/jdk1.5.0_06中的jre，原先的Eclipse的jre也随之改动。

解决方法(Eclipse为例，MyEclipse类似)window->preferences->Java->Installed JRES->Edit->更改jre home为C:/Program Files/Java/jdk1.5.0_06

简单的问题困扰了我一天,在此共享希望对需要的人有所帮助。