How to post a form to a servlet in CQ5.5?

Question

Hi all,
  I'm using CQ5 to develop some things. and now i am not so clearly how to post a 'FORM' and accept with a SERVLET.
  I've seen this 'http://forums.adobe.com/message/4932739#4932739' already, and try it. But once i add a new <input /> like :<input name="age" value="age" />.
and i submit this form, then tell me error: javax.jcr.nodetype.ConstraintViolationException: no matching property definition found for {}age
  see the code
   jsp:
     <!-- String action = /content/myproject/en/thanks   -->
    <form id="submitForm" method="post" action="<%= action %>.POST.html" onsubmit="return validate();">
        <input type="hidden" name=":redirect" value="<%=resourceResolver.map(action)%>" />
        <input type="hidden" name=":formpath" value="<%=currentNode.getPath()%>" />
        <input type="hidden" name=":formtype" value="<%=component.getResourceType()%>" />
        <input type="hidden" name="_charset_" value="utf-8" />
        <input name="age" value="26" />  <!-- if i comment this line, it can submit success, otherwise show me Status: 500. -->
        <input type="submit" value="Submit"/>
    </form>
  servlet:
    @Component(immediate = true, metatype = false, label = "QuestionnaireServlet")
   @Service
   @Properties(value = {
                    @org.apache.felix.scr.annotations.Property(name = "sling.servlet.methods", value = { "POST" }),
                    @org.apache.felix.scr.annotations.Property(name = "sling.servlet.resourceTypes", value = { "sling/servlet/default" }),
                    @org.apache.felix.scr.annotations.Property(name = "sling.servlet.selectors", value = { "POST" }),
                    @org.apache.felix.scr.annotations.Property(name = "sling.servlet.extensions", value = { "html" })
   public class QuestionnaireServlet extends SlingAllMethodsServlet implements
                    OptingServlet {
    protected void doPost(SlingHttpServletRequest request,
                              SlingHttpServletResponse response) throws ServletException,
                              IOException {
          //it seems never call this function.
can anybody told me in details ?

Answer 1

1).open the system/console/bundles and i can see the information of my servlet. include 'Symbolic Name', Version, Bundle Location, Exported Packages and so on.  I think it already a service. right ?
2). change the selector to QAPOST for sling.servlet.selectors
3). add the slash "/" then submit and the browser show me "403 Forbidden"
4). without slash "/" before <action_attr_value>.POST.html, show me 'Status: 500', Message: javax.jcr.nodetype.ConstraintViolationException: no matching property definition found for {}age