Sypie nullem

Musisz najpierw sprawdzi, czy akcja (event.getAction()) to klikniecie np. ppm na blok. Dopiero potem mozesz sprawdzac jego typ.

1.

@EventHandler(priority = EventPriority.HIGH)
        public void onInteract(PlayerInteractEvent e){
                Player p = e.getPlayer();
                if(e.getAction() != Action.RIGHT_CLICK_BLOCK || e.getClickedBlock() == null || e.getClickedBlock().getType() != Material.ENCHANTMENT_TABLE){
					return;
				}
				//...

2.

                                                        || !(p.getItemInHand().getType() == Material.DIAMOND_AXE)

mozesz zrobic tak..

                                                        || p.getItemInHand().getType() != Material.DIAMOND_AXE