diff --git a/src/main/java/com/linyuanlin/minecraft/Manager/DiscordBotManager.java b/src/main/java/com/linyuanlin/minecraft/Manager/DiscordBotManager.java
index 2cc91a3..c85dfef 100644
--- a/src/main/java/com/linyuanlin/minecraft/Manager/DiscordBotManager.java
+++ b/src/main/java/com/linyuanlin/minecraft/Manager/DiscordBotManager.java
@@ -1,6 +1,7 @@
 package com.linyuanlin.minecraft.manager;
 
 import com.linyuanlin.minecraft.App;
+import org.bukkit.plugin.java.JavaPlugin;
 import com.tjplaysnow.discord.object.Bot;
 import com.tjplaysnow.discord.object.ThreadSpigot;
 import net.dv8tion.jda.api.entities.TextChannel;
@@ -13,9 +14,13 @@ public class DiscordBotManager {
     // Key: Bot Tag, Value: Bot
     private final HashMap<String, Bot> bots = new HashMap<>();
 
+    public static App getPlugin() {
+        return JavaPlugin.getPlugin(App.class);
+    }
+
     public void registerNewBot(String tag, String token) {
         Bot b = new Bot(token, tag);
-        b.setBotThread(new ThreadSpigot(App.getPlugin()));
+        b.setBotThread(new ThreadSpigot(getPlugin()));
         bots.put(tag, b);
     }
 
@@ -32,20 +37,20 @@ public void shutDownAllBot() {
     public void sendMessage(String botTag, String channelTag, String message) {
         Bot bot = bots.get(botTag);
         if (bot == null) {
-            App.getPlugin().getLogger().warning("Cannot let bot " + botTag + " send message to channel " + channelTag
+            getPlugin().getLogger().warning("Cannot let bot " + botTag + " send message to channel " + channelTag
                     + " because bot is not exist.");
             return;
         }
         String cId = textChannels.get(channelTag);
         if (cId == null) {
-            App.getPlugin().getLogger().warning("Cannot let bot " + botTag + " send message to channel " + channelTag
+            getPlugin().getLogger().warning("Cannot let bot " + botTag + " send message to channel " + channelTag
                     + " because channel is not exist.");
             return;
         }
 
         TextChannel c = bot.getBot().getTextChannelById(cId);
         if (c == null) {
-            App.getPlugin().getLogger().warning("Cannot let bot " + botTag + " send message to channel " + channelTag
+            getPlugin().getLogger().warning("Cannot let bot " + botTag + " send message to channel " + channelTag
                     + " because channel is not exist.");
             return;
         }
diff --git a/src/main/java/com/linyuanlin/minecraft/Manager/GuildManager.java b/src/main/java/com/linyuanlin/minecraft/Manager/GuildManager.java
index 12e28ef..4cd9ccd 100644
--- a/src/main/java/com/linyuanlin/minecraft/Manager/GuildManager.java
+++ b/src/main/java/com/linyuanlin/minecraft/Manager/GuildManager.java
@@ -6,6 +6,7 @@
 import org.bukkit.*;
 import org.bukkit.command.*;
 import org.bukkit.entity.Player;
+import org.bukkit.plugin.java.JavaPlugin;
 import org.bukkit.inventory.ItemStack;
 import org.jetbrains.annotations.NotNull;
 
@@ -13,15 +14,19 @@
 import java.util.*;
 
 public class GuildManager implements CommandExecutor {
+	public static App getPlugin() {
+		return JavaPlugin.getPlugin(App.class);
+	}
+
 	public GuildManager() {
-		Objects.requireNonNull(App.getPlugin().getCommand("guild")).setExecutor(this);
+		Objects.requireNonNull(getPlugin().getCommand("guild")).setExecutor(this);
 	}
 
 	@Override
 	public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label,
 			@NotNull String[] args) {
 		try {
-			PlayerData p = App.getPlugin().allPlayers.get(((Player) sender).getUniqueId());
+			PlayerData p = getPlugin().allPlayers.get(((Player) sender).getUniqueId());
 			if (p == null) {
 				return false;
 			}
@@ -40,7 +45,7 @@ public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command
 			StringWriter sw = new StringWriter();
 			PrintWriter pw = new PrintWriter(sw);
 			e.printStackTrace(pw);
-			App.getPlugin().discordBotManager.sendMessage("TEST", "Project-Minecraft", sw.toString());
+			getPlugin().discordBotManager.sendMessage("TEST", "Project-Minecraft", sw.toString());
 			return false;
 		}
 	}
diff --git a/src/main/java/com/linyuanlin/minecraft/Manager/LocationManager.java b/src/main/java/com/linyuanlin/minecraft/Manager/LocationManager.java
index 266cfa9..f0337ce 100644
--- a/src/main/java/com/linyuanlin/minecraft/Manager/LocationManager.java
+++ b/src/main/java/com/linyuanlin/minecraft/Manager/LocationManager.java
@@ -4,6 +4,7 @@
 import com.mongodb.client.model.Filters;
 import java.util.*;
 import org.bukkit.*;
+import org.bukkit.plugin.java.JavaPlugin;
 import org.jetbrains.annotations.NotNull;
 import org.bson.Document;
 
@@ -14,13 +15,17 @@ public class LocationManager {
 	public final static String lobby_spawn = "lobby_spawn";
 	public final static String house_spawn = "house_spawn";
 
+	public static App getPlugin() {
+		return JavaPlugin.getPlugin(App.class);
+	}
+
 	private HashMap<String, Location> tagLocationMap = new HashMap<>();;
 
 	public void loadLocations() {
-		List<Document> docList = App.getPlugin().dbClient.findMany("Location", Filters.empty());
+		List<Document> docList = getPlugin().dbClient.findMany("Location", Filters.empty());
 		for (Document doc : docList) {
 			tagLocationMap.put(doc.getString("tag"), this.getLocation(
-					App.getPlugin().worldManager.getWorldData(WorldManager.world_lobby).getWorld(),
+					getPlugin().worldManager.getWorldData(WorldManager.world_lobby).getWorld(),
 					doc));
 		}
 	}
diff --git a/src/main/java/com/linyuanlin/minecraft/Manager/TeamManager.java b/src/main/java/com/linyuanlin/minecraft/Manager/TeamManager.java
index 435c9f0..ce684f3 100644
--- a/src/main/java/com/linyuanlin/minecraft/Manager/TeamManager.java
+++ b/src/main/java/com/linyuanlin/minecraft/Manager/TeamManager.java
@@ -7,6 +7,7 @@
 import org.bukkit.*;
 import org.bukkit.command.*;
 import org.bukkit.entity.Player;
+import org.bukkit.plugin.java.JavaPlugin;
 import org.jetbrains.annotations.NotNull;
 
 import java.io.*;
@@ -18,15 +19,19 @@ public class TeamManager implements CommandExecutor {
 	 */
 	public final static int INVITE_COOLING_MINS = 1;
 
+	public static App getPlugin() {
+		return JavaPlugin.getPlugin(App.class);
+	}
+
 	public TeamManager() {
-		Objects.requireNonNull(App.getPlugin().getCommand("team")).setExecutor(this);
+		Objects.requireNonNull(getPlugin().getCommand("team")).setExecutor(this);
 	}
 
 	@Override
 	public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label,
 			@NotNull String[] args) {
 		try {
-			PlayerData p = App.getPlugin().allPlayers.get(((Player) sender).getUniqueId());
+			PlayerData p = getPlugin().allPlayers.get(((Player) sender).getUniqueId());
 			if (p == null) {
 				return false;
 			}
@@ -47,7 +52,7 @@ public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command
 			StringWriter sw = new StringWriter();
 			PrintWriter pw = new PrintWriter(sw);
 			e.printStackTrace(pw);
-			App.getPlugin().discordBotManager.sendMessage("TEST", "Project-Minecraft", sw.toString());
+			getPlugin().discordBotManager.sendMessage("TEST", "Project-Minecraft", sw.toString());
 			return false;
 		}
 	}
@@ -88,14 +93,14 @@ private boolean invite(PlayerData senderPlayer, String[] args) {
 			return false;
 		}
 
-		PlayerData receiverPlayer = App.getPlugin().allPlayers.get(p.getUniqueId());
+		PlayerData receiverPlayer = getPlugin().allPlayers.get(p.getUniqueId());
 		if (receiverPlayer == null) {
 			senderPlayer.player().sendMessage("你邀請的玩家 " + ChatColor.GOLD + args[1] + ChatColor.WHITE
 					+ " 不存在於allPlayers中,請聯繫開發人員");
 			return false;
 		}
 
-		Optional<Team> team = App.getPlugin().allPlayers.get(receiverPlayer.player().getUniqueId()).team();
+		Optional<Team> team = getPlugin().allPlayers.get(receiverPlayer.player().getUniqueId()).team();
 
 		if (receiverPlayer == senderPlayer) {
 			senderPlayer.player().sendMessage(ChatColor.RED + "不能邀請自己");
@@ -163,7 +168,7 @@ private boolean join(PlayerData senderPlayer, String[] args) throws Exception {
 					"你要加入的隊伍的邀請人 " + ChatColor.GOLD + args[1] + ChatColor.WHITE + " 不存在或是不在線上！");
 			return false;
 		}
-		PlayerData receiverPlayer = App.getPlugin().allPlayers.get(p.getUniqueId());
+		PlayerData receiverPlayer = getPlugin().allPlayers.get(p.getUniqueId());
 		if (receiverPlayer == null) {
 			senderPlayer.player().sendMessage("你要加入的隊伍的邀請人" + ChatColor.GOLD + args[1] + ChatColor.WHITE
 					+ "不存在於allPlayers中, 請聯繫開發人員");
diff --git a/src/main/java/com/linyuanlin/minecraft/Manager/TradeManager.java b/src/main/java/com/linyuanlin/minecraft/Manager/TradeManager.java
index 81e789a..54e7dda 100644
--- a/src/main/java/com/linyuanlin/minecraft/Manager/TradeManager.java
+++ b/src/main/java/com/linyuanlin/minecraft/Manager/TradeManager.java
@@ -5,6 +5,7 @@
 import org.bukkit.*;
 import org.bukkit.command.*;
 import org.bukkit.entity.Player;
+import org.bukkit.plugin.java.JavaPlugin;
 import org.jetbrains.annotations.NotNull;
 import java.util.Objects;
 
@@ -15,8 +16,12 @@ public class TradeManager implements CommandExecutor {
 	 * constants
 	 */
 
+	public static App getPlugin() {
+		return JavaPlugin.getPlugin(App.class);
+	}
+
 	public TradeManager() {
-		Objects.requireNonNull(App.getPlugin().getCommand("trade")).setExecutor(this);
+		Objects.requireNonNull(getPlugin().getCommand("trade")).setExecutor(this);
 	}
 
 	@Override
@@ -24,7 +29,7 @@ public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command
 			@NotNull String[] args) {
 
 		try {
-			PlayerData p = App.getPlugin().allPlayers.get(((Player) sender).getUniqueId());
+			PlayerData p = getPlugin().allPlayers.get(((Player) sender).getUniqueId());
 
 			if (p == null) {
 				return false;
@@ -42,7 +47,7 @@ public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command
 			StringWriter sw = new StringWriter();
 			PrintWriter pw = new PrintWriter(sw);
 			e.printStackTrace(pw);
-			App.getPlugin().discordBotManager.sendMessage("TEST", "Project-Minecraft", sw.toString());
+			getPlugin().discordBotManager.sendMessage("TEST", "Project-Minecraft", sw.toString());
 			return false;
 		}
 	}
@@ -80,7 +85,7 @@ private boolean pay(PlayerData senderPlayer, String[] args) {
 			return false;
 		}
 
-		PlayerData receiverPlayer = App.getPlugin().allPlayers.get(p.getUniqueId());
+		PlayerData receiverPlayer = getPlugin().allPlayers.get(p.getUniqueId());
 		if (receiverPlayer == null) {
 			senderPlayer.player().sendMessage(
 					"玩家 " + ChatColor.GOLD + receiverName + ChatColor.WHITE + " 不存在或是不在線上");
diff --git a/src/main/java/com/linyuanlin/minecraft/PluginMessageHandler.java b/src/main/java/com/linyuanlin/minecraft/PluginMessageHandler.java
index caa078d..3dc161d 100644
--- a/src/main/java/com/linyuanlin/minecraft/PluginMessageHandler.java
+++ b/src/main/java/com/linyuanlin/minecraft/PluginMessageHandler.java
@@ -7,12 +7,17 @@
 import org.bukkit.Bukkit;
 import org.bukkit.ChatColor;
 import org.bukkit.entity.Player;
+import org.bukkit.plugin.java.JavaPlugin;
 import org.bukkit.plugin.messaging.PluginMessageListener;
 import org.jetbrains.annotations.NotNull;
 
 import java.util.Objects;
 
 public class PluginMessageHandler implements PluginMessageListener {
+    public static App getPlugin() {
+        return JavaPlugin.getPlugin(App.class);
+    }
+
     @Override
     public void onPluginMessageReceived(String channel, @NotNull Player player, byte[] message) {
         Bukkit.getConsoleSender().sendMessage("receive plugin message");
@@ -49,7 +54,7 @@ public void sendPluginMessage(String subChannel, String PluginMessage) {
         out.writeUTF(subChannel);
         out.writeUTF(PluginMessage);
         Bukkit.getConsoleSender().sendMessage("send plugin message: " + subChannel + ' ' + PluginMessage);
-        Objects.requireNonNull(Iterables.getFirst(Bukkit.getOnlinePlayers(), null)).sendPluginMessage(App.getPlugin(),
+        Objects.requireNonNull(Iterables.getFirst(Bukkit.getOnlinePlayers(), null)).sendPluginMessage(getPlugin(),
                 "BungeeCord", out.toByteArray());
     }
 
diff --git a/src/main/java/com/linyuanlin/minecraft/mongodb/MongodbClient.java b/src/main/java/com/linyuanlin/minecraft/mongodb/MongodbClient.java
index 1817551..b9d8175 100644
--- a/src/main/java/com/linyuanlin/minecraft/mongodb/MongodbClient.java
+++ b/src/main/java/com/linyuanlin/minecraft/mongodb/MongodbClient.java
@@ -5,17 +5,22 @@
 import com.mongodb.client.*;
 import org.bson.Document;
 import org.bson.conversions.Bson;
+import org.bukkit.plugin.java.JavaPlugin;
 
 import java.util.*;
 
 public class MongodbClient {
+    public static App getPlugin() {
+        return JavaPlugin.getPlugin(App.class);
+    }
+
     public FindIterable<Document> cursor;
     private MongoClient client;
     private MongoDatabase database;
 
     public MongodbClient(String databaseName) {
         try {
-            this.client = MongoClients.create(App.getPlugin().mongodbConnectString);
+            this.client = MongoClients.create(getPlugin().mongodbConnectString);
             this.database = this.client.getDatabase(databaseName);
         } catch (Exception e) {
             e.printStackTrace();