Fly - half Jonathan Sexton converted all three tries .
Fly - half Jonathan Sexton kicked three penalties for a personal haul of 15 points as Leinster added the 2012 title to those they won in 2009 and 2011 .
Fly - half Jonathan Sexton converted all three tries and kicked three penalties for a personal haul of 15 points as Leinster added the 2012 title to those they won in 2009 and 2011 .