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logic iterate

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I am working on my first struts application and am caught up with the listbox. Instead of hard coding the values need to generate it with an vector, i read couple of articles,but never successful.
I defined the vector and added couple of values.
When i defined it in jsp, i got null pointer, not sure why, can someone give me a simple example of logic iterate.I have problem understanding what should go in the name"..." property"...."
The file I have the vector is and the getter and setters are in and the jsp is requestpage.jsp.
My requestpage.jsp when submitted goes to mainaction for validation, this is where i am confused.Should my vector be in this file should it be in some file which would be invoked during the load of requestpage.jsp.
Any clarification or example, much appreciated.
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I dont know whether this is helpful for you
In my action class i am getting list of values which i want to display in jsp using iterate tag.
So in my Action class i am setting it as
In JSP to display values from this using logic iterator
So there i am giving as
<logic:iterate name="CrmsMergeDuplicateBorrower" id="TableColumn">

<td class="BasCellAmount" width="4%" height="20"> </td>
<td class="BasCellAmount" width="50%" height="20">

<bean:write name="TableColumn" property="itemDescription"/>
<td class="BasCellAmount" width="30%" height="20">
<bean:write name="TableColumn" property="itemValue"/>
<html:hidden name="TableColumn" property="itemCode"/>
<td class="BasCellAmount" width="2%" height="20"> </td>

Here i am not defining property for logi:iterate tag.
for more detailed explanation for logic:iterate please go through jakarta tutorial. Its really helpful
Try this way
I dont know exactly whats your problem is . But hope this will help you
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