Re: Problem in using logic:iterate in struts

Laurie Harper Wed, 24 Sep 2008 13:23:01 -0700

If the action isn't being called, that would explain why the data theaction pushes into request scope can't be found... Sounds like the linkis pointing to the JSP instead of the action, then. How are yourendering the links? What are they rendering as? (i.e. what is thegenerated HTML?)

L.


UITOT wrote:

Hello Laurie,
                Thanx a lot for replying.Let me tell you the exact
scenario.I am developing a discussion forum for my Project.There is one JSP
called "View_topic.jsp".This will display the list of all topics in the
Discussion Forum.Before this JSP one action class say "view_topics_Action"
is getting called which is setting the arraylist for topics say "topic_list"
in request scope.This list is getting displayed using logic:iterate in
view_topic.jsp.No problem till here.Now when user clicks on a particular
topic I want that all the threads related to that topic should get
displayed.So I have made each topic as a Hyperlink.Now when user clicks on a
particular topic I want the topic_id to get passed to some action class say
"view_threads_Action" which will take care of retrieving the Threads details
for that topic & if it is successful it will call another JSP say
"View_threads.jsp".


Now I don't have any problem in displaying topic list.I am getting error
only when I am clicking on the hyperlink.The error is in JSP
"view_topic.jsp" only so it not going to action class "view_threads_Action".
I hope I am able to explain my problem.Please help.Thanx.

Laurie Harper wrote:

Unfortunately your struts-config.xml and JSP code didn't make it throughto the list properly. Make sure you're sending your message as plain text.


A couple of questions:

*) How are you accessing the page? (i.e. what URL are you typing?)

*) Are you sure you are calling the action before the JSP is rendered?What happens if you put a println at the top of execute()


L.

UITOT wrote:

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" %>

<[EMAIL PROTECTED] contentType="text/html" pageEncoding="UTF-8"%>

Discussion Forum

                                        Forum
                                        Topic/Messages
                                Last Post

// this is the statement which is generating errorget_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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Re: Problem in using logic:iterate in struts

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