Only showing join/leave/etc. messages if not hooked

src/main/java/buttondevteam/discordplugin/ChromaBot.java

@@ -0,0 +1,11 @@
+package buttondevteam.discordplugin;
+
+import lombok.Getter;
+
+public class ChromaBot {
+	/**
+	 * May be null if it's not initialized
+	 */
+	public @Getter ChromaBot instance;
+	// TODO
+}

src/main/java/buttondevteam/discordplugin/DiscordPlugin.java

@@ -44,14 +44,21 @@ public class DiscordPlugin extends JavaPlugin implements IListener<ReadyEvent> {
 	public static DiscordPlugin plugin;
 	public static boolean SafeMode = true;
 	public static List<String> GameRoles;
+	public static boolean hooked = false;
 
 	@SuppressWarnings("unchecked")
 	@Override
 	public void onEnable() {
 		try {
 			Bukkit.getLogger().info("Initializing DiscordPlugin...");
-			PlayerListWatcher.hookUp();
-			Bukkit.getLogger().info("Finished hooking into the player list");
+			try {
+				PlayerListWatcher.hookUp();
+				hooked = true;
+				Bukkit.getLogger().info("Finished hooking into the player list");
+			} catch (Throwable e) {
+				e.printStackTrace();
+				Bukkit.getLogger().warning("Couldn't hook into the player list!");
+			}
 			plugin = this;
 			lastannouncementtime = getConfig().getLong("lastannouncementtime");
 			lastseentime = getConfig().getLong("lastseentime");

src/main/java/buttondevteam/discordplugin/listeners/MCListener.java

@@ -68,7 +68,8 @@ public class MCListener implements Listener {
 					+ " do /discord accept");
 			p.sendMessage("§bIf it wasn't you, do /discord decline");
 		}
-		MCChatListener.sendSystemMessageToChat(e.GetPlayer().PlayerName().get() + " joined the game");
+		if (!DiscordPlugin.hooked)
+			MCChatListener.sendSystemMessageToChat(e.GetPlayer().PlayerName().get() + " joined the game");
 		MCChatListener.ListC = 0;
 		DiscordPlugin.updatePlayerList();
 	}
@@ -83,7 +84,8 @@ public class MCListener implements Listener {
 				() -> MCChatListener.ConnectedSenders.values().stream()
 						.filter(s -> s.getUniqueId().equals(e.getPlayer().getUniqueId())).findAny()
 						.ifPresent(dcp -> callEventExcludingSome(new PlayerJoinEvent(dcp, ""))));
-		MCChatListener.sendSystemMessageToChat(e.GetPlayer().PlayerName().get() + " left the game");
+		if (!DiscordPlugin.hooked)
+			MCChatListener.sendSystemMessageToChat(e.GetPlayer().PlayerName().get() + " left the game");
 		Bukkit.getScheduler().runTaskLaterAsynchronously(DiscordPlugin.plugin, DiscordPlugin::updatePlayerList, 5);
 	}
 
@@ -105,7 +107,8 @@ public class MCListener implements Listener {
 
 	@EventHandler(priority = EventPriority.LOW)
 	public void onPlayerDeath(PlayerDeathEvent e) {
-		MCChatListener.sendSystemMessageToChat(e.getDeathMessage());
+		if (!DiscordPlugin.hooked)
+			MCChatListener.sendSystemMessageToChat(e.getDeathMessage());
 	}
 
 	@EventHandler