title: Spring3 exclude binding form field
body: <p>I have this question. Suppose in the <code>jsp</code> form I have some hidden field:</p>
  
  <pre><code>&lt;form:form modelAttribute="TrainingInstructorForm"&gt;
  &lt;form:hidden name="tmpFileID" /&gt;
  &lt;/form:form&gt;
  </code></pre>
  
  <p>I want that the <code>tmpFileID</code> will not be bound to the <code>TrainingInstructorForm</code> as this is not part of the <code>TrainingInstructorForm</code> domain model and rather a convenience thing for communicating information from the user to the controller. I intend to access this using:</p>
  
  <pre><code>@RequestMapping(value="..")
  public String submit(HttpServletRequest request) {
      String tmpFileId = request.getParameter("tmpFileId);
  }
  </code></pre>
  
  <p>How can I tell the <code>spring</code> framework which fields to go for binding and which fields not in addition of them being available to the <code>http servlet</code> request?</p>
  
  <p>Thanks</p>