World Guard

@EventHandler
	public void preProcessCommand(PlayerCommandPreprocessEvent e)
	{
		if (e.getMessage().equalsIgnoreCase("classes"))
		{
			Player wgplayer = e.getPlayer();
			LocalPlayer localPlayer = WorldGuardPlugin.inst().wrapPlayer(wgplayer);
			World world = localPlayer.getWorld();
			Location loc = new Location(world, localPlayer.getLocation().getX(), localPlayer.getLocation().getY(), localPlayer.getLocation().getZ());
			RegionContainer container = WorldGuard.getInstance().getPlatform().getRegionContainer();
			RegionQuery query = container.createQuery();
			ApplicableRegionSet set = query.getApplicableRegions(loc);

			List<ProtectedRegion> regions = Lists.newArrayList(set);
			for (ProtectedRegion region : set)
			{
				if (!region.getId().equalsIgnoreCase("spawn"))
				{
					wgplayer.sendMessage("You are not allowed to do that!");
					e.setCancelled(true);
				}
				return;
			}
		}
		return;
	}