Solved MaterialData not working!!!

I'm trying to rotate stairs, instead of use block.setData(byte data); I am using the Stairs class and stairs.setFacingDirection(); but it isn't working.

Here is the code:

Code:

@EventHandler
public void interactTEST(PlayerInteractEvent e)
{
  Block b = e.getClickedBlock();
 
  MaterialData materialdata = b.getState().getData();
 
  if(materialdata instanceof Stairs)
  {
    Bukkit.broadcastMessage("test");
    Stairs stairs = (Stairs)blockdata;
    stairs.setFacingDirection(BlockFace.NORTH);
  }
}

I am interacting with the stair, it is broadcasting "test" but it is not rotating to North...
Please help

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

Code:

       @EventHandler
       public void interactTEST(PlayerInteractEvent e)
       {
         Block b = e.getClickedBlock();
       
         MaterialData materialdata = b.getState().getData();
       
         if(materialdata instanceof Stairs)
         {
           Bukkit.broadcastMessage("test");
           Stairs stairs = (Stairs) materialdata;
           stairs.setFacingDirection(BlockFace.NORTH);
           b.setData(stairs.getData());
         }
       }

 

Thank you so much!