struts+hibernate写新闻发布,删除管理员帐号时出现以下错误

我用struts+hibernate写新闻发布，在删除管理员帐号时出现以下错误，是哪里错了？ description：   The   server   encountered   an   internal   error   ()   that   prevented   it   from   fulfilling   this   request. exception   javax.servlet.ServletException:   Index:   0,   Size:   0 
org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:523) 
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421) 
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224) 
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194) 
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414) 
javax.servlet.http.HttpServlet.service(HttpServlet.java:689) 
javax.servlet.http.HttpServlet.service(HttpServlet.java:802) 
com.news.filter.EncodingFilter.doFilter(EncodingFilter.java:15)