Didn't notice the order IDEA generated the onEnable and onDisable methods...

Author: jamezrin

Spigot Addon/src/main/java/com/jaimemartz/playerbalanceraddon/MainCommand.java

@@ -1,5 +1,8 @@
 package com.jaimemartz.playerbalanceraddon;
 
+import com.google.common.base.Strings;
+import net.md_5.bungee.api.ChatColor;
+import net.md_5.bungee.api.chat.ComponentBuilder;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
@@ -13,6 +16,12 @@ public MainCommand(PlayerBalancerAddon plugin) {
 
     @Override
     public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
+        if (cmd.getName().equalsIgnoreCase("balanceraddon"))
+
+        sender.spigot().sendMessage(new ComponentBuilder(Strings.repeat("-", 53)).strikethrough(true).color(ChatColor.GRAY).create());
+        sender.spigot().sendMessage(new ComponentBuilder("Available commands:").color(ChatColor.GRAY).create());
+        sender.spigot().sendMessage(new ComponentBuilder("/section connect <section> [player]").color(ChatColor.AQUA).append(" - ").color(ChatColor.GRAY).append("Connects you or the specified player to that section").color(ChatColor.RED).create());
+        sender.spigot().sendMessage(new ComponentBuilder(Strings.repeat("-", 53)).strikethrough(true).color(ChatColor.GRAY).create());
         return false;
     }
 }

Spigot Addon/src/main/java/com/jaimemartz/playerbalanceraddon/PlayerBalancerAddon.java

@@ -6,14 +6,14 @@ public class PlayerBalancerAddon extends JavaPlugin {
     private PluginMessageManager manager;
 
     @Override
-    public void onDisable() {
+    public void onEnable() {
         manager = new PluginMessageManager(this);
-        getCommand("balancer").setExecutor(new MainCommand(this));
+        getCommand("balanceraddon").setExecutor(new MainCommand(this));
     }
 
     @Override
-    public void onEnable() {
-
+    public void onDisable() {
+        //Nothing to do...
     }
 
     public PluginMessageManager getManager() {

Spigot Addon/src/main/java/com/jaimemartz/playerbalanceraddon/PluginMessageManager.java

@@ -38,7 +38,7 @@ public void onPluginMessageReceived(String channel, Player player, byte[] messag
             ByteArrayDataInput in = ByteStreams.newDataInput(message);
             String subchannel = in.readUTF();
 
-            contexts.get(new MessageContext(channel, subchannel, player))
+            contexts.get(new MessageContext(channel, subchannel, player.getUniqueId()))
                     .stream().findFirst().ifPresent(a -> a.accept(in));
         }
     }
@@ -64,7 +64,7 @@ public boolean getSectionByName(String section, Consumer<String> consumer) {
         contexts.put(new MessageContext(
                 "PlayerBalancer",
                 "GetSectionByName",
-                player
+                player.getUniqueId()
         ), ByteArrayDataInput::readUTF);
 
         return true;
@@ -84,7 +84,7 @@ public boolean getSectionByServer(String server, Consumer<String> consumer) {
         contexts.put(new MessageContext(
                 "PlayerBalancer",
                 "GetSectionByServer",
-                player
+                player.getUniqueId()
         ), ByteArrayDataInput::readUTF);
         return true;
     }
@@ -98,16 +98,16 @@ public void getSectionOfPlayer(Player player, Consumer<String> consumer) {
         contexts.put(new MessageContext(
                 "PlayerBalancer",
                 "GetSectionOfPlayer",
-                player
+                player.getUniqueId()
         ), ByteArrayDataInput::readUTF);
     }
 
     private final class MessageContext {
         private final String channel;
         private final String subchannel;
-        private final Player player;
+        private final UUID player;
 
-        public MessageContext(String channel, String subchannel, Player player) {
+        public MessageContext(String channel, String subchannel, UUID player) {
             this.channel = channel;
             this.subchannel = subchannel;
             this.player = player;

Spigot Addon/src/main/resources/plugin.yml

@@ -1,4 +1,6 @@
 name: PlayerBalancerAddon
 main: com.jaimemartz.playerbalanceraddon.PlayerBalancerAddon
 version: ${project.version}
-author: jaime29010
+author: jaime29010
+
+softdepend: [PlaceholderAPI]