<span style="font-family: KaiTi_GB2312; font-size: 18px;">错误表现:</span>
<span style="font-family: KaiTi_GB2312; font-size: 18px;">可以正常发布项目不报错,访问jsp和http://localhost:8080就报错,后台报的错:org.apache.catalina.core.StandardWrapperValve invoke SEVERE: Servlet.service() for servlet [jsp] in context with path [] threw exception [java.lang.ClassCastException: org.apache.jasper.el.ELContextImpl cannot be cast to org.apache.jasper.el.ELContextImpl] with root cause java.lang.ClassCastException: org.apache.jasper.el.ELContextImpl cannot be cast to org.apache.jasper.el.ELContextImpl 前台的: java.lang.ClassCastException: org.apache.jasper.el.ELContextImpl cannot be cast to org.apache.jasper.el.ELContextImpl</span>
<span style="font-family: KaiTi_GB2312; font-size: 18px;">错误解决办法:</span>
<pre id="best-content-1250561739" class="best-text mb-10" name="code" style="white-space: pre-wrap; word-wrap: break-word; margin-top: 0px; margin-bottom: 10px; padding: 0px;"><span style="font-family: KaiTi_GB2312; font-size: 18px; background-color: rgb(255, 255, 255);">EL表达式的错误 解决方案1: 当项目中引用tomcat目录下面的lib下面的catalina.jar的时候,用myeclipse将项目部署到tomcat下面的时候,会将catalina.jar包加到项目的web-inf下面的lib文件夹下面,这样这个包就会和tomcat下面的lib下面的catalina.jar包冲突会报java.lang.ClassCastException: org.apache.catalina.util.DefaultAnnotationProcessor错误,解决方法是将项目部署到tomcat下面后,将项目的web-inf/lib下面的catalina.jar删掉,然后在重启tomcat,ok。 方案2: 修改了tomcat里的context.xml文件,在context 元素下添加 <Context> <Loader delegate="true" /></span>