java.lang.InstantiationException: DWR can't find a spring config. See the logs for solutions

在spring整合dwr时，报找不到配置文件

DWRcan't find a spring config. See the logs for solutions

解决办法：

在web.xml中添加一下代码

<listener>  
 <listener-class>  
 org.springframework.web.context.ContextLoaderListener  
 </listener-class>  
</listener>