Chest Inventory won't clear

I'm trying to make a PlayerInteractEvent clear a chest that is right-clicked, but it does not work. The inventory is never cleared. How do I fix this?

Code:java

    @EventHandler
    public void onPlayerInteract(PlayerInteractEvent evt) {
        Player user = evt.getPlayer();
        if(this.manager.isInAnArena(user)) {
            if(user.getItemInHand().equals(Material.COMPASS)) {
                Arena arena = this.manager.getArenaFromPlayer(user);
                if(arena != null) {
                    if(arena.getArenaState().equals(ArenaState.IN_GAME)) {
                        Player nearestPlayer = arena.getSlender().findNearestPlayer();
                        if(nearestPlayer != null) {
                            user.teleport(nearestPlayer.getLocation());
                            this.slender.getMessages().sendPlayerMsg(user, "SLENDERMAN_TELEPORT", null);
                        }
                    }
                }
          }else {
                if(evt.getAction() == Action.RIGHT_CLICK_BLOCK) {
                    Block block = evt.getClickedBlock();
                    if(block.getType() == Material.SIGN_POST || block.getType() == Material.WALL_SIGN) {
                        Sign sign = (Sign)block.getState();
                        if(sign.getLine(0).contains("[Slender]")) {
                            String arenaName = ChatColor.stripColor(sign.getLine(1));
                            Arena checkArena = this.manager.getArena(arenaName);
                            if(checkArena != null) {
                                if(checkArena.getArenaState() == ArenaState.WAITING || checkArena.getArenaState() == ArenaState.SETTING_UP) {
                                    checkArena.addPlayer(evt.getPlayer());
                                }else {
                                    if(checkArena.getArenaState() == ArenaState.DISABLED) {
                                        this.slender.getMessages().sendPlayerMsg(user, "JOIN_FAILURE_DISABLED", null);
                                    }
                                }
                            }else {
                                user.sendMessage(arenaName);
                                this.slender.getMessages().sendPlayerMsg(evt.getPlayer(), "ARENA_NONEXISTANT", null);
                            }
                        }
                    }else if(block.getState() instanceof Chest) {
                            Chest chest = (Chest)block.getState();
                            Inventory inv = chest.getBlockInventory();
                            Arena arena = this.manager.getArenaFromPlayer(user);
                            if(arena != null) {
                                if(arena.getSlender().getPlayer().equals(user) == false) {
                                    ItemStack item = inv.getItem(0);
                                    if(item != null) {
                                        if(item.getType() == Material.PAPER) {
                                            if(stopCooldown) {
                                                cooldown = false;
                                            }
                                            if(cooldown == false) {
                                                cooldown = true;
                                                if(inv.getContents().length > 0) {
                                                    inv.clear();
                                                    chest.update(true);
                                                    Game game = this.manager.getGameInstance(arena);
                                                    game.setCollectedObjectives(game.getCollectedObjectives() + 1);
                                                    user.playSound(user.getLocation(), Sound.ORB_PICKUP, 1F, 1F);
                                                    this.slender.getMessages().sendPlayerMsg(user, "OBJECTIVE_OBTAIN", null);
                                                    this.manager.getGameInstance(arena).sendArenaMessage(String.format(this.slender.getMessages().getConfMessage("OBJECTIVE_FOUND_ANNOUNCE"), user.getName()));
                                                }
                                                this.doCooldown();
                                            }
                                            evt.setCancelled(true);
                                        }
                                    }
                                    if((inv.getContents().length == 0) || (item == null)) {
                                        this.slender.getMessages().sendPlayerMsg(user, "OBJECTIVE_FAIL_TAKEN", null);
                                    }
                                }else {
                                    this.slender.getMessages().sendPlayerMsg(user, "OBJECTIVE_FAIL_SLENDERMAN", null);
                                    evt.setCancelled(true);
                                }
                            }
                        }
                    }
                }
          }
    }

 

chest.getInventory().setContents(null); & debugg your code.

 

RenegadeEagle

That causes a NPE.

bump

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