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From UITOT <nehaagrawa...@gmail.com>
Subject Problem in using logic:iterate in struts
Date Tue, 23 Sep 2008 07:57:48 GMT

Hello all,
I have developed 1 application using struts.I am getting this error in my
JSP.I have used logic:iterate.I have populated an arraylist in action class
which I am using in my JSP.I am able to see the data from the arraylist in
my JSP but I am getting error when I am clicking on the hyperlink in
JSP.This is the error.Please help me as I am pretty new to struts.Any help
will be highly appreciated.Thanx in advance.

ApplicationDispatcher[/TGMC_DB1-2009] PWC1231: Servlet.service() for servlet
jsp threw exception
javax.servlet.jsp.JspException: Cannot find bean: "topic_list" in any scope
at org.apache.struts.taglib.TagUtils.lookup(TagUtils.java:935)
at org.apache.struts.taglib.logic.IterateTag.doStartTag(IterateTag.java:232)
at org.apache.jsp.viewThreads_jsp._jspService(viewThreads_jsp.java from
:121)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:93)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:470)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:364)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
at
org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:411)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:317)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:198)
at
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:198)
at
org.apache.catalina.core.ApplicationDispatcher.doInvoke(ApplicationDispatcher.java:853)
at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:703)
at
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:542)
at
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:474)
at
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:366)
at
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1085)
at
org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:263)
at
org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:398)
at
org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig(TilesRequestProcessor.java:318)
at
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:241)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:718)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
at
org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:411)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:317)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:198)
at
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:198)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:288)
at
org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:271)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:202)
at
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:632)
at
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:577)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:94)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:206)
at
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:632)
at
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:577)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:571)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1080)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:150)
at
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:632)
at
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:577)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:571)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1080)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:270)
at
com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.invokeAdapter(DefaultProcessorTask.java:637)
at
com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.doProcess(DefaultProcessorTask.java:568)
at
com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.process(DefaultProcessorTask.java:813)
at
com.sun.enterprise.web.connector.grizzly.DefaultReadTask.executeProcessorTask(DefaultReadTask.java:339)
at
com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:261)
at
com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:212)
at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:265)
at
com.sun.enterprise.web.connector.grizzly.ssl.SSLWorkerThread.run(SSLWorkerThread.java:106)
StandardWrapperValve[action]: PWC1406: Servlet.service() for servlet action
threw exception
javax.servlet.jsp.JspException: Cannot find bean: "topic_list" in any scope
at org.apache.struts.taglib.TagUtils.lookup(TagUtils.java:935)
at org.apache.struts.taglib.logic.IterateTag.doStartTag(IterateTag.java:232)
at org.apache.jsp.viewThreads_jsp._jspService(viewThreads_jsp.java from
:121)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:93)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:470)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:364)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
at
org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:411)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:317)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:198)
at
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:198)
at
org.apache.catalina.core.ApplicationDispatcher.doInvoke(ApplicationDispatcher.java:853)
at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:703)
at
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:542)
at
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:474)
at
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:366)
at
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1085)
at
org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:263)
at
org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:398)
at
org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig(TilesRequestProcessor.java:318)
at
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:241)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:718)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
at
org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:411)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:317)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:198)
at
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:198)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:288)
at
org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:271)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:202)
at
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:632)
at
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:577)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:94)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:206)
at
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:632)
at
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:577)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:571)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1080)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:150)
at
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:632)
at
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:577)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:571)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1080)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:270)
at
com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.invokeAdapter(DefaultProcessorTask.java:637)
at
com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.doProcess(DefaultProcessorTask.java:568)
at
com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.process(DefaultProcessorTask.java:813)
at
com.sun.enterprise.web.connector.grizzly.DefaultReadTask.executeProcessorTask(DefaultReadTask.java:339)
at
com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:261)
at
com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:212)
at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:265)

*//Action class*
package com.myapp.struts;
 
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import java.util.ArrayList;
 
public class DiscussionForumViewAction extends Action {
 
   
  public ActionForward execute(ActionMapping mapping,
    ActionForm form,
    HttpServletRequest request,
    HttpServletResponse response)
    throws IOException, ServletException
 {
   
      String target = new String("success");
   
        try
        {
         ArrayList TopicList = null;
         TopicList= Discussion_Forum.getTopics();
         request.setAttribute("topic_list",TopicList);
        }
        catch(Exception ex)
        {
            System.out.println(ex.getMessage());
        }
      return (mapping.findForward(target));
 }
       
}
 
*// jsp*
 
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
 
<%@page contentType="text/html" pageEncoding="UTF-8"%>

 

    
    
   
    
        
        

 
Discussion Forum

 

 
        

              
           
            

                            
                             

                                	Forum
                                	Topic/Messages
                               	Last Post
                             
                            
                            
                               
                                
                                  
                                    

                                      	
// this is the statement which is generating error                                       
 
get_threads.do?topic_id=<bean:write name= ">      
                                    
    
                                    	
                                    
                                   
                              
                                   	
                                   
                                  
   
                                
                            
                        
                 
           

        

    
 

 
*//struts config*
    
               
               
       
   
 
*//formbean*
package com.myapp.struts;
 
import javax.servlet.http.HttpServletRequest;
 
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
 
public class TopicFormBean extends ActionForm {
 
  protected String topic_name;
  protected String description;
  protected Integer no_of_threads;
  protected String last_post;
  protected Integer topic_id;
 
 
 
    public String getTopic_name() {
        return topic_name;
    }
 
    public void setTopic_name(String topic_name) {
        this.topic_name = topic_name;
    }
 
    public String getDescription() {
        return description;
    }
 
    public void setDescription(String desc) {
        this.description = desc;
    }
 
     public Integer getNo_of_threads() {
        return no_of_threads;
    }
 
    public void setNo_of_threads(Integer no_of_threads) {
        this.no_of_threads = no_of_threads;
    }
 
    public String getLast_post() {
        return last_post;
    }
 
    public void setLast_post(String last_post) {
        this.last_post = last_post;
    }
 
     public Integer getTopic_id() {
        return topic_id;
    }
 
    public void setTopic_id(Integer topic_id) {
        this.topic_id = topic_id;
    }
 
      }

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