Merge pull request 'Making listener stuff volatile to fix NPE's with multiple threads accessing them' (#253) from BetterInit into master

Reviewed-on: SteamWar/BungeeCore#253
Reviewed-by: Lixfel <lixfel@steamwar.de>

src/de/steamwar/bungeecore/bot/SteamwarDiscordBot.java

@@ -55,13 +55,13 @@ public class SteamwarDiscordBot {
     }
 
     @Getter
-    private AnnouncementListener announcementListener;
+    private volatile AnnouncementListener announcementListener;
 
     @Getter
-    private IngameChatListener ingameChatListener;
+    private volatile IngameChatListener ingameChatListener;
 
     @Getter
-    private ServerTeamChatListener serverTeamChatListener;
+    private volatile ServerTeamChatListener serverTeamChatListener;
 
     @Getter
     private final JDA jda;
@@ -100,7 +100,6 @@ public class SteamwarDiscordBot {
             DiscordRolesMessage.sendMessage();
             DiscordRulesMessage.sendMessage();
             DiscordTicketMessage.sendMessage();
-
             new RolesInteractionButtonListener();
             new DiscordTicketListener();
             new DiscordAuthListener();
@@ -109,7 +108,6 @@ public class SteamwarDiscordBot {
             ingameChatListener = new IngameChatListener();
             serverTeamChatListener = new ServerTeamChatListener();
             new SlashCommandListener();
-
             jda.retrieveCommands().complete().forEach(command -> jda.deleteCommandById(command.getId()).queue());
 
             Guild guild = jda.getGuildById(SteamwarDiscordBotConfig.GUILD);