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Struts: nesting <bean:write>tag in a <logic:equal> tag (inside a javascript)

Posted on 2003-10-22
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Last Modified: 2013-11-19
I have a javascript that makes a 'tree-view' for me. I managed to already get the tree-view to build trees whose values are taken from my db. The problem is, I want to be able to check the bean of the 'first' array such that if it equals the one located in the second array, it will print/iterate.

Here's a short explanation of my code: the changeItemProducts array is only used to get the 'subject' names. Inside each 'subject' are sub-entries. (For example, Paint has sub-entries like: watercolor, etc). Now, the changeItems array contains the sub-entries (I also added in this array from what 'subject' they come are from).

Now I want to check that if the value of the subject in the changeItems array = value of the subject in the changeItemProducts array, print all the sub-entries. If not, skip it (because it may not have any sub-entries yet in the db) and check the next entries.

Here's my Javascript code for it:

<logic:iterate id="changeItemProduct" name="changeItemProducts">

      folCA = insFld(foldersTree, gFld("<bean:write name="changeItemProduct" property="productName" />", ""))
            headCA = insDoc(folCA, gLnk("S", makeHeader("Title","#cccccc"), "",makeHeader("CR#","#cccccc"),makeHeader("Date Submitted","#cccccc"),makeHeader("Target Date","#cccccc"),makeHeader("Phase","#cccccc")))
            headCA.iconSrc = ICONPATH + "ftv2blank.gif"
               
            <logic:iterate id="changeItem" name="changeItems">
                <logic:equal name="changeItem" property="productName" value="<bean:write name="changeItemProduct" property="productName" /> ">
                    insDoc(folCA, gLnk("S", "<bean:write name="changeItem" property="title" />", "/ADM/GetWorkOrders.do?changeItemNumber=<bean:write name="changeItem" property="changeItemNumber" />", "<bean:write name="changeItem" property="changeItemNumber" />", "<bean:write name="changeItem" property="dateSubmitted" />", "<bean:write name="changeItem" property="targetDate" />", "<bean:write name="changeItem" property="phaseNumber" />"))
                </logic:equal>
            </logic:iterate>
               
</logic:iterate>

The error I get is: equal symbol expected

on this part of the code(at least I think it is this part of the code):

<logic:equal name="changeItem" property="productName" value="<bean:write name="changeItemProduct" property="productName" /> ">

I heard that nesting within a struts tag is not possible. Is there a way to do this? Thanks in advance!
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Question by:cicoii
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LVL 14

Expert Comment

by:kennethxu
Comment Utility
you cannot use one tag as another tag's property value, try this:
<logic:equal name="changeItem" property="productName" value="<%=changeItemProduct.getProductName()%>">

let me know if you have further enquires

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Author Comment

by:cicoii
Comment Utility
Hi kennethxu!

I tried the code you wrote but I'm getting an error when I load the page:


Generated servlet error:
    [javac] Compiling 1 source file

C:\tomcat\work\Standalone\localhost\ADM\jsp\Change Item\chi_list_jsp.java:133: cannot resolve symbol
symbol  : variable changeItemProducts
location: class org.apache.jsp.chi_list_jsp
              _jspx_th_logic_equal_0.setValue(changeItemProduct.getProductName());
                                              ^
1 error

Any ideas? Thanks again!
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Expert Comment

by:kennethxu
Comment Utility
can you tell me how do you define your changeItemProduct bean? thanks.
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Assisted Solution

by:znaps
znaps earned 25 total points
Comment Utility
Try this - It is similar to Kenneth's code and should work for all cases:

<bean:define id="prodName" name="changeItemProduct" property="productName/>

<logic:equal name="changeItem" property="productName" value="<%= prodName %>">

....rest of code...
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Expert Comment

by:znaps
Comment Utility
Sorry, that should read:

<bean:define id="prodName" name="changeItemProduct" property="productName"/>

<logic:equal name="changeItem" value="<%= prodName %>">

....rest of code...
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Author Comment

by:cicoii
Comment Utility
kennethxu,

When I try to use the bean:define or jsp:useBean with my code, I always end up getting an error. Am not quite sure how to use this though. I had always assumed that when I place my array in an logic:iterate it will be working ok. I also tried using znaps <bean:define> code but I also get an error (see below). Any help would be greatly appreciated. Thanks!

Znaps,

I tried out your code but am still getting an error similar to the one above:


Generated servlet error:
    [javac] Compiling 1 source file

C:\tomcat\work\Standalone\localhost\ADM\jsp\Change Item\chi_list_jsp.java:153: cannot resolve symbol
symbol  : method setValue (java.lang.Object)
location: class org.apache.struts.taglib.logic.EqualTag
              _jspx_th_logic_equal_0.setValue( prodName );
                                    ^
1 error

Any help would be greatly appreciated. Thanks!
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Expert Comment

by:kennethxu
Comment Utility
can you post your full jsp page?
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Author Comment

by:cicoii
Comment Utility
Hi kennethxu,

Thanks for all your replies. Hope you can help me with this one :-)

I've included the full jsp page as well as snippets of my java codes (in case this will be helpful in solving this problem)

Here's my full jsp page: (chi_list.jsp)

<%@ page language="java" %>
<%@ 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 import="com.hp.adm.changeItem.ListChangeItemsAction"%>
<%@ page import="com.hp.adm.changeItem.ChangeItem"%>
<%@ page import="com.hp.adm.changeItem.ChangeItemProduct"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3c.org/TR/1999/REC-html401-19991224/loose.dtd">
<HTML><HEAD><TITLE>Change Management portal</TITLE>

<!-- Code for browser detection -->
<script src="/ADM/doc_root/ua.js"></script>

<!-- Infrastructure code for the tree -->
<script src="/ADM/doc_root/ftiens4.js"></script>

<!-- Execution of the code that actually builds the specific tree.
     The variable foldersTree creates its structure with calls to
       gFld, insFld, and insDoc -->
<script>
// Decide if the names are links or just the icons
USETEXTLINKS = 1  //replace 0 with 1 for hyperlinks

// Decide if the tree is to start all open or just showing the root folders
STARTALLOPEN = 0 //replace 0 with 1 to show the whole tree

ICONPATH = '/ADM/images/' //change if the gif's folder is a subfolder, for example: '/ADM/images/'

foldersTree = gFld("", "")
foldersTree.iconSrc = ICONPATH + "s.gif"
<jsp:useBean id="changeItemProduct" type="com.hp.adm.changeItem.ChangeItemProduct"/>

<logic:iterate id="changeItemProduct" name="changeItemProducts">

      folCA = insFld(foldersTree, gFld("<bean:write name="changeItemProduct" property="productName" />", ""))
            headCA = insDoc(folCA, gLnk("S", makeHeader("Title","#cccccc"), "",makeHeader("CR#","#cccccc"),makeHeader("Date Submitted","#cccccc"),makeHeader("Target Date","#cccccc"),makeHeader("Phase","#cccccc")))
            headCA.iconSrc = ICONPATH + "ftv2blank.gif"
           
            <logic:iterate id="changeItem" name="changeItems">
                <logic:equal name="changeItem" property="productName" value="<%= changeItemProduct.getProductName%>">          
                    insDoc(folCA, gLnk("S", "<bean:write name="changeItem" property="title" />", "/ADM/GetWorkOrders.do?changeItemNumber=<bean:write name="changeItem" property="changeItemNumber" />", "<bean:write name="changeItem" property="changeItemNumber" />", "<bean:write name="changeItem" property="dateSubmitted" />", "<bean:write name="changeItem" property="targetDate" />", "<bean:write name="changeItem" property="phaseNumber" />"))
                </logic:equal>              
            </logic:iterate>
               
</logic:iterate>
                /*
<option selected>All Open Items</option>
<option>Fall 2003 Release</option>
<option>Spring 2004 Release</option>
<option>Fall 2004 Release</option>
*/

release = new Array("Fall 2003 Release","Spring 2004 Release","Fall 2004 Release");
monthly = new Array("January 2003","February 2003","March 2003","April 2003","May 2003","June 2003","July 2003","August 2003");
prodrel = new Array("R","M","R","M","R","R","R","R","R","M","M","M","M","M","M","M","M","M","M");

function changeRelease(select,charChWin,start){
      for (i = select.options.length; i >= start; i--) {
            select.options[i] = null;
      }
      chWinArray = (charChWin == "R") ? release : monthly;

      for (i = start; i < start + chWinArray.length; i++) {
            select.options[i] = new Option(chWinArray[i-start]);
      }
}

</script>


</HEAD>
<LINK rel="stylesheet" type="text/css" href="/ADM/doc_root/hpweb.css">
<BODY text=#000000 vLink=#660066 aLink=#003366 link=#003366 bgColor=#ffffff
leftMargin=0 topMargin=0 marginwidth="0" marginheight="0">

<%@ include file="/jsp/common/top_panel.jsp" %>

<!-- End Search Area --><!--startindex--><!-- Begin Page Title and Printable Version Area -->
<TABLE cellSpacing=0 cellPadding=0 width=740 border=0>
  <TBODY>
  <TR>
    <TD vAlign=center align=middle width=170><A
      href=""><IMG height=53
      src="/ADM/images/hpc60_topnav_hp_logo.gif"
      width=63 border=0></A><BR></TD>
    <TD width=10><IMG height=93 alt="" src="/ADM/images/s.gif"
    width=10></TD>
    <TD vAlign=top align=left width=406><BR><IMG height=6 alt=""
      src="/ADM/images/s.gif" width=1><BR>
      <H1>change items</H1><IMG height=4 alt="" src="/ADM/images/s.gif"
      width=1></TD><!--stopindex--><!--Start Print-->
    <TD vAlign=top align=left width=154><IMG height=10 alt=""
      src="/ADM/images/s.gif" width=1>&nbsp;</TD><!--End Print--></TR></TBODY></TABLE><!-- End Page Title and Printable Version Area --><!--End top inc--><!--End top inc--><!-- Begin Left Navigation and Content Area.  To increase width of content area, modify width of table below. -->
<TABLE cellSpacing=0 cellPadding=0 width=740 border=0 height=423>
  <TBODY>

<!--Start Left inc--><!--Start Left inc--><!-- Start Left Navigation -->

<%@ include file="/jsp/common/left_panel.jsp" %>
 
<!-- End Left Navigation -->



<!--startindex--><!--End Left inc--><!--End Left inc--><!-- Start Content Area.  To increase width of content area, modify width of table cell below. -->

    <TD vAlign=top align=left width=560><!--Start Top table-->

      <TABLE cellSpacing=0 cellPadding=0 width=560 border=0>
        <TBODY>
        <TR class=midheader>
          <TD width=10 class=rightheader><IMG height=20 alt="" src="/ADM/images/s.gif"
            width=10 border=0></TD>
          <TD width=550 class=rightheader>»&nbsp;list change items</TD></TR>
        <TR class=decoration>
          <TD colSpan=2><IMG height=10 alt="" src="/ADM/images/s.gif"
            width=10 border=0></TD></TR>
        <TR>
          <TD class=color003366 vAlign=top width=10>&nbsp</TD>
          <TD vAlign=top width=550>
<form>
<select name=products id="countrySelect" onChange="changeRelease(changeWindow,prodrel[this.selectedIndex],1)">
<option selected>Core Manufacturing</option>
<option>&nbsp;»&nbsp;Capital Management</option>
<option>&nbsp;»&nbsp;Contract Manufacturing</option>
<option>&nbsp;»&nbsp;Costing</option>
<option>&nbsp;»&nbsp;Maintenance and Storeroom</option>
<option>&nbsp;»&nbsp;Production Execution</option>
<option>&nbsp;»&nbsp;Purchasing</option>
<option>&nbsp;»&nbsp;Quality Management</option>
<option>&nbsp;»&nbsp;Cross-Row</option>
<option>Supplier Connectivity</option>
<option>&nbsp;»&nbsp;TDX ERP to ERP</option>
<option>&nbsp;»&nbsp;Supplier Portal</option>
<option>&nbsp;&nbsp;&nbsp;&nbsp;»&nbsp;Web Visibility</option>
<option>&nbsp;&nbsp;&nbsp;&nbsp;»&nbsp;Web Entry</option>
<option>&nbsp;&nbsp;&nbsp;&nbsp;»&nbsp;Document Collaboration</option>
<option>&nbsp;&nbsp;&nbsp;&nbsp;»&nbsp;REG</option>
<option>&nbsp;&nbsp;&nbsp;&nbsp;»&nbsp;eCOA</option>
<option>&nbsp;&nbsp;&nbsp;&nbsp;»&nbsp;RTIM</option>
<option>&nbsp;»&nbsp;Syncra</option>
<option>WOM</option>
</select>
<select name="changeWindow" id="countrySelect">
<option selected>All Open Items</option>
<option>Fall 2003 Release</option>
<option>Spring 2004 Release</option>
<option>Fall 2004 Release</option>
</select>
<INPUT type=image alt="List" src="/ADM/images/hpc60_arrow_submit.gif" border=0 name=submit></A>
</form>
          </TD></TR>
          </TBODY></TABLE>

      <TABLE cellSpacing=0 cellPadding=0 width=560 border=0>
        <TBODY>
        <TR class=midheader>
          <TD width=10 class=rightheader><IMG height=20 alt="" src="/ADM/images/s.gif"
            width=10 border=0></TD>
          <TD width=550 class=rightheader>»&nbsp;all open items</TD></TR>
        <TR class=decoration>
          <TD colSpan=2>


      <!--      <IMG height=10 alt="" src="/ADM/images/s.gif" width=10 border=0></TD></TR>      -->      
        <TR>
          <TD class=color003366 vAlign=top width=10>&nbsp</TD>
          <TD vAlign=top width=550>

<!-- Removing this link will make the script stop from working -->
<a href="http://www.treemenu.net/"></a>

<!-- Build the browser's objects and display default view of the
     tree. -->
<script>initializeDocument()</script>

          </TD></TR>
        <TR class=decoration>
          <TD colSpan=2><IMG height=10 alt="" src="/ADM/images/s.gif"
            width=10 border=0></TD></TR>
        <TR>
          </TBODY></TABLE>

<!-- END HumanTag Monitor. DO NOT MOVE! MUST BE PLACED JUST BEFORE THE /BODY TAG --><!--End bottom inc--></BODY></HTML>

ListChangeItemsAction.java:

//  ******************EXECUTE****************//
   
    public ActionForward execute(ActionMapping mapping,
            ActionForm form,
            HttpServletRequest request,
            HttpServletResponse response)
            throws IOException, ServletException, Exception {
               
                ArrayList returnChangeItems = getChangeItems();
                ArrayList returnChangeItemProducts = getChangeItemProducts();
                request.setAttribute("changeItems", returnChangeItems);
                request.setAttribute("changeItemProducts", returnChangeItemProducts);
                //Forwards to the appropriate View
                return (mapping.findForward("continueToListChangeItems"));
            }

ChangeItem.java: (shows the variables I set and get)

    protected int changeItemNumber;
    protected String title;
    protected String dateSubmitted;
    protected String targetDate;
    protected int phaseNumber;
    protected String productName;ChangeItemProduct.java:

ChangeItemProduct: (shows the variables I set and get)

    protected int changeItemProductNumber;
    protected String productName;
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Expert Comment

by:znaps
Comment Utility
My last post contained one more mistake (I left out the property="productName" attribute)....sorry! This works fine in my code so I'm not sure why it wouldn't work for you:

<bean:define id="prodName" name="changeItemProduct" property="productName"/>

<logic:equal name="changeItem"  property="productName" value="<%= prodName %>">

....rest of code...
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Expert Comment

by:kennethxu
Comment Utility
1. I think you might not need the <jsp:useBean>, but this is the right why to use it:
<jsp:useBean id="changeItemProducts" type="java.util.List" scope="request"/>
<jsp:useBean id="changeItems" type="java.util.List" scope="request"/>

2. you should specify the type in <logic:iterate>
<logic:iterate id="changeItemProduct" name="changeItemProducts" type="com.hp.adm.changeItem.ChangeItemProduct"/>

3. you missed the parentheses for your get method:
<logic:equal name="changeItem" property="productName" value="<%=changeItemProduct.getProductName()%>">

I think znaps' code will also work.
Let us know.
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Author Comment

by:cicoii
Comment Utility
Hi again,

I tried what you guys said, but I'm still getting the same error: (below for your reference - this is while using kennethxu's code). I also tried znaps' code but am getting a similar error as well. Can this be caused by an error with java or tomcat? I'm not sure why I'm getting this error...

org.apache.jasper.JasperException: Unable to compile class for JSP

An error occurred at line: 30 in the jsp file: /jsp/common/left_panel.jsp

Generated servlet error:
    [javac] Compiling 1 source file

C:\tomcat\work\Standalone\localhost\ADM\jsp\Change Item\chi_list_jsp.java:137: cannot resolve symbol
symbol  : variable changeItemProduct
location: class org.apache.jsp.chi_list_jsp
          _jspx_th_logic_equal_0.setValue(changeItemProduct.getProductName());
                                          ^
1 error

Using this code in jsp:

<logic:iterate id="changeItemProduct" name="changeItemProducts" type="com.hp.adm.changeItem.ChangeItemProduct"/>

      folCA = insFld(foldersTree, gFld("<bean:write name="changeItemProduct" property="productName" />", ""))
            headCA = insDoc(folCA, gLnk("S", makeHeader("Title","#cccccc"), "",makeHeader("CR#","#cccccc"),makeHeader("Date Submitted","#cccccc"),makeHeader("Target Date","#cccccc"),makeHeader("Phase","#cccccc")))
            headCA.iconSrc = ICONPATH + "ftv2blank.gif"
           
            <logic:iterate id="changeItem" name="changeItems">
                <logic:equal name="changeItem" property="productName" value="<%=changeItemProduct.getProductName()%>">          
                    insDoc(folCA, gLnk("S", "<bean:write name="changeItem" property="title" />", "/ADM/GetWorkOrders.do?changeItemNumber=<bean:write name="changeItem" property="changeItemNumber" />", "<bean:write name="changeItem" property="changeItemNumber" />", "<bean:write name="changeItem" property="dateSubmitted" />", "<bean:write name="changeItem" property="targetDate" />", "<bean:write name="changeItem" property="phaseNumber" />"))
                </logic:equal>              
            </logic:iterate>
               
</logic:iterate>




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LVL 14

Expert Comment

by:kennethxu
Comment Utility
Strange! which version of Struts r u using?
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Author Comment

by:cicoii
Comment Utility
I use struts 1.1 along with jdk 1.3.1_06.

At first, I had problems also with this while using <bean:write> but it worked after later on....this is getting rather strange...

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Expert Comment

by:kennethxu
Comment Utility
can you send the jsp file and  2 bean java file to kennethxu at yahoo.com? I'll try to test.
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Author Comment

by:cicoii
Comment Utility
kennethxu,

sent you the files. Hope you can see if it works at your end. Thanks
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Expert Comment

by:kennethxu
Comment Utility
Hmm, this should get it fixed:

foldersTree = gFld("", "")
foldersTree.iconSrc = ICONPATH + "s.gif"

<logic:iterate id="changeItemProduct" name="changeItemProducts"/>
<jsp:useBean id="changeItemProduct" type="com.hp.adm.changeItem.ChangeItemProduct"/>

     folCA = insFld(foldersTree, gFld("<bean:write name="changeItemProduct" property="productName" />", ""))
          headCA = insDoc(folCA, gLnk("S", makeHeader("Title","#cccccc"), "",makeHeader("CR#","#cccccc"),makeHeader("Date Submitted","#cccccc"),makeHeader("Target Date","#cccccc"),makeHeader("Phase","#cccccc")))
          headCA.iconSrc = ICONPATH + "ftv2blank.gif"

           
            <logic:iterate id="changeItem" name="changeItems">
                <logic:equal name="changeItem" property="productName" value="<%=changeItemProduct.getProductName()%>">
                    insDoc(folCA, gLnk("S", "<bean:write name="changeItem" property="title" />", "/ADM/GetWorkOrders.do?changeItemNumber=<bean:write name="changeItem" property="changeItemNumber" />", "<bean:write name="changeItem" property="changeItemNumber" />", "<bean:write name="changeItem" property="dateSubmitted" />", "<bean:write name="changeItem" property="targetDate" />", "<bean:write name="changeItem" property="phaseNumber" />"))
                </logic:equal>              
            </logic:iterate>
               
</logic:iterate>

the trick is this line:
<jsp:useBean id="changeItemProduct" type="com.hp.adm.changeItem.ChangeItemProduct"/>
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Expert Comment

by:kennethxu
Comment Utility
BTW, you'd better start to use JSTL now, those struts logic, bean taglibs will soon be obsoleted.
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Author Comment

by:cicoii
Comment Utility
Well, I got it to work...somewhat. I had to get rid of one of the <logic:iterate> tags (in kennethxu's code) because the first line:

<logic:iterate id="changeItemProduct" name="changeItemProducts"/>

is already 'ended'. Unfortunately, now, I can't loop thru my array anymore. Only the first item is shown. Any remedies for this? =) (Take note that if I simply remove the backslash in the logic:iterate code above, I get an error already). Thanks.

This is how my code went:

<logic:iterate id="changeItemProduct" name="changeItemProducts"/>
<jsp:useBean id="changeItemProduct" type="com.hp.adm.changeItem.ChangeItemProduct"/>

     folCA = insFld(foldersTree, gFld("<bean:write name="changeItemProduct" property="productName" />", ""))
          headCA = insDoc(folCA, gLnk("S", makeHeader("Title","#cccccc"), "",makeHeader("CR#","#cccccc"),makeHeader("Date Submitted","#cccccc"),makeHeader("Target Date","#cccccc"),makeHeader("Phase","#cccccc")))
          headCA.iconSrc = ICONPATH + "ftv2blank.gif"
           
            <logic:iterate id="changeItem" name="changeItems">
                <logic:equal name="changeItem" property="productName" value="<%=changeItemProduct.getProductName()%>">
                    insDoc(folCA, gLnk("S", "<bean:write name="changeItem" property="title" />", "/ADM/GetWorkOrders.do?changeItemNumber=<bean:write name="changeItem" property="changeItemNumber" />", "<bean:write name="changeItem" property="changeItemNumber" />", "<bean:write name="changeItem" property="dateSubmitted" />", "<bean:write name="changeItem" property="targetDate" />", "<bean:write name="changeItem" property="phaseNumber" />"))
                </logic:equal>              
            </logic:iterate>
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Accepted Solution

by:
kennethxu earned 100 total points
Comment Utility
this time, I toke the code you initially posted and did following:

1. remove 2 include, because I don't have those jsp files.
2. removed jsp:useBean
3. change first iterate to:
<logic:iterate id="changeItemProduct" name="changeItemProducts" type="com.hp.adm.changeItem.ChangeItemProduct" >
4. change the equal to:
<logic:equal name="changeItem" property="productName" value="<%= changeItemProduct.getProductName()%>">

and it worked!

I'll also send you the file by email.
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Author Comment

by:cicoii
Comment Utility
It works! Finally works! :-)

Thanks kennethxu for everything. Znap's as well!

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Expert Comment

by:znaps
Comment Utility
Glad to hear
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Expert Comment

by:kennethxu
Comment Utility
As always, my pleasure.
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Viewers will learn about the different types of variables in Java and how to declare them. Decide the type of variable desired: Put the keyword corresponding to the type of variable in front of the variable name: Use the equal sign to assign a v…
Viewers will learn about the regular for loop in Java and how to use it. Definition: Break the for loop down into 3 parts: Syntax when using for loops: Example using a for loop:

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