SEVERE: Servlet.service() for servlet default threw exception, java.lang.IllegalStateException

[Emi Lu]

Hello,

I always get the following exception, does someone know why?
web.xml
============
   <filter>
      <filter-name>struts</filter-name>

<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
       <init-param>
           <param-name>actionPackages</param-name>
           <param-value>action</param-value>
       </init-param>
   </filter>

  <filter-mapping>
      <filter-name>struts</filter-name>
      <url-pattern>/*</url-pattern>
      <dispatcher>REQUEST</dispatcher>
      <dispatcher>INCLUDE</dispatcher>
   </filter-mapping>

Thanks a lot!
Emi
--

SEVERE: Servlet.service() for servlet default threw exception
java.lang.IllegalStateException
	at 
org.apache.catalina.connector.ResponseFacade.sendError(ResponseFacade.java:407)
        at 
org.apache.struts2.dispatcher.Dispatcher.sendError(Dispatcher.java:819)
	at 
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:519)
	at 
org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:434)
	at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at 
org.displaytag.filter.ResponseOverrideFilter.doFilter(ResponseOverrideFilter.java:125)
	at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
	at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
	at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
        at 
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
        at java.lang.Thread.run(Thread.java:662)

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