java.lang.ClassCastException:org.apache.catalina.util.DefaultAnnotationProcessor

 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>

 

 

 <Loader delegate="true" />    要置于其他配置之前，否则依旧会出错。

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>

 

转自http://blog.csdn.net/xiaxiaorui2003/article/details/5735328  感谢！