java.lang.ClassCastException:org.apache.catalina.util.DefaultAnnotationProcessor cannot be cast to org.apache.AnnotationProcesso详解编程语言

 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 </p> <p> at org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:522) </p> <p> at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:356)<br />

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 </p> <p><Loader delegate=”true” /><br />

但是我本地有点问题 ，下面这样子可以，不会报错，

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

这样子依然会出错

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