private void printListeners(final CommandSender sender) { ProtocolManager manager = ProtocolLibrary.getProtocolManager(); sender.sendMessage(ChatColor.GOLD + "Packet listeners:"); for (PacketListener listener : manager.getPacketListeners()) { sender.sendMessage(ChatColor.GOLD + " - " + listener); } // Along with every asynchronous listener sender.sendMessage(ChatColor.GOLD + "Asynchronous listeners:"); for (PacketListener listener : manager.getAsynchronousManager().getAsyncHandlers()) { sender.sendMessage(ChatColor.GOLD + " - " + listener); } }