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*

<%@(protected)" %>
<%@(protected)" %>
<%@(protected)" %>

<%@(protected)"%>



 
 
 
 
   
   


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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