title: Client ack with MDB
body: <p>As far as I know there is only AUTO_ACKNOWLEDGE and DUPS_OK_ACKNOWLEDGE possible with MDB.
  I would like to have something like CLIENT_ACKNOWLEDGE to avoid XA transactions. </p>
  
  <p>Basically what I want:
  get a message --> start local transaction --> perform db operations --> end local transaction --> ack message</p>
  
  <p>Do you know how to achieve this?</p>
  
  <p>Currently i use Jboss 5.1.GA.</p>