访问tomcat7 java.lang.ClassCastException: org.apache.jasper.el.ELContextImpl

<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>