public class BlockPlaceListener implements Listener {

    public Badbox69 plugin;

    public BlockPlaceListener(Badbox69 plugin) {
        this.plugin = plugin;
    }

    @EventHandler(ignoreCancelled = true)
    public void onBlockPlace(BlockPlaceEvent e) {
        System.out.println("h");
        FileConfiguration config = this.plugin.getConfig();
        Player p = e.getPlayer();
        Block block = e.getBlockPlaced();
        ItemStack itemStack = new ItemStack(block.getType());

        block.setMetadata("PLACED_BY_PLAYER", new FixedMetadataValue(this.plugin, true));

        if(!config.getBoolean("block-decay.enabled")) return;

        if(p.isOp() && !config.getBoolean("block-decay.ignore-op")) return;

        e.setCancelled(true);

        try{
            long ms = config.getLong("block-decay.time");
            System.out.println("trycatch");
            Thread.sleep(ms * 1000 * 60);
            Location loc = block.getLocation();
            loc.getBlock().setType(Material.AIR);

        } catch (InterruptedException exception) {
            exception.printStackTrace();
        }
    }
}