title: Unique couple of values + Hibernate and bulk insertion
body: <p>my object: <a href="http://pastebin.com/FWEGwcL0" rel="nofollow">http://pastebin.com/FWEGwcL0</a></p>
  
  <p>I need to prevent adding rows with couple (name; surname) that already exist.
  I.e.: I can add (John; Brown), (John; White), (Louise; Brown) but I should prevent adding another (John; Brown).</p>
  
  <p>When I save objects I do saving a List.
  This means that if I put the key on DB to let the couple (name, surname) unique, I'm afraid that when I save the list of objects, if one fails, all the other values fails too.</p>
  
  <p>How can i prevent this?</p>
  
  <p>Thank you very much!</p>