I have the following "form.jsp" program, it generates a drop down list, below the list is a textarea to show the display_name of a selected item, now when user selected a item, it shows the selected item id in the textarea, how to call the DB from my code and get the display_name in the javascript so the result display_name will be shown in the textarea ?

<%@ taglib prefix="s" uri="/struts-tags"%>

<script type="text/javascript">
function callme(Display_Name)
{
  alert('callme : Display_Name = '+Display_Name);
  var v=document.getElementById('hiddenValue').value;
  alert('hiddenValue : v = '+v);
  document.getElementById('defaultDisplayName').value=Display_Name;
}
</script>

     <s:hidden id="pricelist.id" name="pricelist.id" value="%{pricelist.id}"/>
     <div class="dialog">
         <table>
             <tbody>
                 <s:if test="%{enableProductList}"> 
                 <tr class="prop">
                     <td valign="top" class="name required"><label for="description">Product:</label></td>
                     <td valign="top">
                         <s:select id="productPrice.product" 
                                   name="productPrice.product"
                                   headerKey="0" 
                                   headerValue="-- Select Product --"
                                   list="products" 
                                   listKey="id" 
                                   listValue="name"
                                   value="productPrice.product.id"
                                   theme="simple"
                                   displayName1='value'
                                   onchange="callme(value)"
                                   />
                         <s:hidden id="hiddenValue" name="hiddenValue" value="123"/>


                     </td>
                 </tr> 
                 </s:if>
                 <tr class="prop">
                     <td valign="top" class="name"><label for="description">Default Display Name:</label></td>
                     <td valign="top"><s:textarea id="defaultDisplayName" name="defaultDisplayName" theme="simple" readonly="true"/></td>
                 </tr> 

See attached image for details, in the DB, a product table has the product Id and display_name, I know the Id, how to use Java to get the display_name and plug it into the jsp ?