java.lang.ClassCastException:org.apache.catalina.util.DefaultAnnotationProcessor cannot be cast to org.apache.AnnotationProcesso

 在tomcat 中测试comet技术，结果工程出现这样的错误，

org.apache.jasper.JasperException: java.lang.ClassCastException:org.apache.catalina.util.DefaultAnnotationProcessor cannot be cast to org.apache.AnnotationProcessor at org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:522) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:356)

 

后来网上查了下，需要

修改了tomcat里的context.xml文件，在context 元素下添加 <Loader delegate="true" />

 

 

但是我本地有点问题 ，下面这样子可以，不会报错，

<Context> <Loader delegate="true" /> <!-- Default set of monitored resources --> <WatchedResource>WEB-INF/web.xml</WatchedResource> <!-- Uncomment this to disable session persistence across Tomcat restarts --> <!-- <Manager pathname="" /> --> <!-- Uncomment this to enable Comet connection tacking (provides events on session expiration as well as webapp lifecycle) --> <!-- <Valve className="org.apache.catalina.valves.CometConnectionManagerValve" /> --> </Context>

 

 

这样子依然会出错

<Context> <!-- Default set of monitored resources --> <WatchedResource>WEB-INF/web.xml</WatchedResource> <!-- Uncomment this to disable session persistence across Tomcat restarts --> <!-- <Manager pathname="" /> --> <!-- Uncomment this to enable Comet connection tacking (provides events on session expiration as well as webapp lifecycle) --> <!-- <Valve className="org.apache.catalina.valves.CometConnectionManagerValve" /> --> <Loader delegate="true" /> </Context>