关于struts标签的问题

Question

Failed to obtain specified collection  这个问题的起因是什么，上次做好后可以用，这次就不能用了，程序也没有出错 org.apache.jasper.JasperException: Failed to obtain specified collection
        org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:512)
        org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
        org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
        org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1085)
        org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:263)
        org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:398)
        org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig(TilesRequestProcessor.java:318)
        org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:241)
        org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
        org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause javax.servlet.ServletException: Failed to obtain specified collection
        org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:843)
        org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:776)
        org.apache.jsp.com.jzl.shen.alarm.AddNetAlarm_jsp._jspService(AddNetAlarm_jsp.java:421)
        org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334)
        org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
        org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1085)
        org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:263)
        org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:398)
        org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig(TilesRequestProcessor.java:318)
        org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:241)
        org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
        org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause javax.servlet.jsp.JspException: Failed to obtain specified collection
        org.apache.struts.taglib.html.OptionsCollectionTag.doStartTag(OptionsCollectionTag.java:176)
        org.apache.jsp.com.jzl.shen.alarm.AddNetAlarm_jsp._jspx_meth_html_optionsCollection_2(AddNetAlarm_jsp.java:619)
        org.apache.jsp.com.jzl.shen.alarm.AddNetAlarm_jsp._jspx_meth_html_select_2(AddNetAlarm_jsp.java:588)
        org.apache.jsp.com.jzl.shen.alarm.AddNetAlarm_jsp._jspService(AddNetAlarm_jsp.java:284)
        org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334)
        org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
        org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1085)
        org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:263)
        org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:398)
        org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig(TilesRequestProcessor.java:318)
        org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:241)
        org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
        org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

Answer 1

此回复为自动发出,仅用于显示而已，并无任何其他特殊作用
楼主【java_chuxuezhe】截止到2008-07-07 17:28:49的历史汇总数据(不包括此帖)：
发帖的总数量:0                        发帖的总分数:0                        
结贴的总数量:0                        结贴的总分数:0                        
无满意结贴数:0                        无满意结贴分:0                        
未结的帖子数:0                        未结的总分数:0                        
结贴的百分比:---------------------结分的百分比:---------------------
无满意结贴率:---------------------无满意结分率:---------------------
如何结贴请参考这里：http://topic.csdn.net/u/20080501/09/ef7ba1b3-6466-49f6-9d92-36fe6d471dd1.html

Answer 2

Failed to obtain specified collection 
没找到集合