Page Comparison

<!-- Spring form tag will cause duplicate ids -->
<form:select path="title" items="${titles}" />

<!-- when rendered might look something like this -->
<select id="title" name="title">
  <option value="Mr">Mr</option>
  <option value="Mrs">Mrs</option>
  <option value="Miss">Miss</option>
</select>

<!-- Instead specify a namespaced id -->

<c:set var="n"><portlet:namespace /></c:set>

<form:select id="${n}title" path="title" items="${titles}" />