Map-backed action form and multibox problem

[C H]

Hi,

I’m working on an application that’s designed to render dynamic pages that 
take as input an ArrayList of DisplayItemBeans.  Each DisplayItemBean has 
properties that define:
(a) the UI widget type (text, checkbox, radio button, etc)
(b) the data item’s db column name (used as key in an action form Map)
(c) for selection-type widgets (listbox, checkbox, radio button), a list of 
available options.

I defined a Map-backed ActionForm and a jsp template to work with this 
ArrayList (pls see code snippets below).  The pages render fine for all 
types of widgets except checkboxes.  When I use the html:multibox tag, I 
encounter the following problem:

[ServletException in:/WEB-INF/jsp/dynaBody.jsp] No getter method available 
for property multibox_key_name for bean under name 
org.apache.struts.taglib.html.BEAN'

However, using the same code, if I just change the widget type to radio 
button or select, things work fine.  I’d appreciate any comments on what I 
did wrong and suggestions on how I can fix it.

Thanks

------------- CODE SNIPPETS FOLLOW ----------------

============= ACTION FORM =========================

public class OnlsDynaActionForm extends ActionForm {

  public OnlsDynaActionForm() {
        super();
  }
  //QUES: Sample from jakarta website declared this Map as final.
  //Does it need to be final? What's the advantage of using final?
  private final Map values = new HashMap();
  public void setValue(String key, Object value) {
     values.put(key, value);
  }
  public Object getValue(String key) {
     return values.get(key);
  }
}
======================= JSP =========================

[Assume that dispList, an ArrayList of DisplayItemBeans, exists in some 
scope and:
- has get/set methods for scrn_clmn (label to display), db_clmn (column name 
used as key in ActionForm map), options (ArrayList of LabelValueBeans 
containing choices for selection widgets)
- has helper methods such as isUITypeCheckbox() to identify what type of 
widget it is]

<logic:iterate id="dib" name="dispList" type="DisplayItemBean" >
<tr>
<bean:define id="db_clmn" value='<%= "value(" + dib.getDb_clmn() + ")" %>'/>
    <td><bean:write name="dib" property="scrn_clmn" /></td>
    <td>
	<% if (dib.isUITypeCheckbox() ) { %>
	     <logic:iterate id="opt" name="dib" property="options" 
type="org.apache.struts.util.LabelValueBean" >
                         <html:multibox  property="<%=dib.getDb_clmn()%>" >
                         <bean:write name="opt" property="value" />
                         </html:multibox>
                         <bean:write name="opt" property="label" />
	     </logic:iterate>
	<% } else if (dib.isUITypeRadiobutton() ) { %>
		... display using html:radio
	<% } else if ...{ %>
		...handle other cases
	<% } %>
    </td>
</tr>
</logic:iterate>

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