这个异常 困扰 我很久了， 一直没有查到是什么原因 大虾们 帮帮忙 ！！！

[2010/03/19 15:23:18.859] javax.servlet.ServletException: com.opensymphony.xwork2.ActionSupport.msgcount()
[2010/03/19 15:23:18.859]  at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:515)
[2010/03/19 15:23:18.859]  at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:419)
[2010/03/19 15:23:18.859]  at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:70)
[2010/03/19 15:23:18.859]  at org.apache.struts2.dispatcher.ActionContextCleanUp.doFilter(ActionContextCleanUp.java:99)
[2010/03/19 15:23:18.859]  at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:70)
[2010/03/19 15:23:18.859]  at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:174)
[2010/03/19 15:23:18.859]  at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:77)
[2010/03/19 15:23:18.859]  at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:70)
[2010/03/19 15:23:18.859]  at org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:176)
[2010/03/19 15:23:18.859]  at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145)
[2010/03/19 15:23:18.859]  at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:92)
[2010/03/19 15:23:18.859]  at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:381)
[2010/03/19 15:23:18.859]  at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:70)
[2010/03/19 15:23:18.859]  at org.water.utils.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:75)
[2010/03/19 15:23:18.859]  at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:77)
[2010/03/19 15:23:18.859]  at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:70)
[2010/03/19 15:23:18.859]  at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:173)
[2010/03/19 15:23:18.859]  at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
[2010/03/19 15:23:18.859]  at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:274)
[2010/03/19 15:23:18.859]  at com.caucho.server.port.TcpConnection.run(TcpConnection.java:511)
[2010/03/19 15:23:18.859]  at com.caucho.util.ThreadPool.runTasks(ThreadPool.java:516)
[2010/03/19 15:23:18.859]  at com.caucho.util.ThreadPool.run(ThreadPool.java:442)
[2010/03/19 15:23:18.859]  at java.lang.Thread.run(Thread.java:595)