refactoring and docs

src/main/java/com/github/nilstrieb/commands/fun/DepartureCommand.java

@@ -1,7 +1,7 @@
 package com.github.nilstrieb.commands.fun;
 
 import com.github.nilstrieb.cofig.Config;
-import com.github.nilstrieb.commands.handler.Command;
+import com.github.nilstrieb.core.command.Command;
 import com.github.nilstrieb.util.DepartureSong;
 import net.dv8tion.jda.api.EmbedBuilder;
 

src/main/java/com/github/nilstrieb/commands/fun/FightCommand.java

@@ -1,7 +1,7 @@
 package com.github.nilstrieb.commands.fun;
 
 import com.github.nilstrieb.cofig.Config;
-import com.github.nilstrieb.commands.handler.Command;
+import com.github.nilstrieb.core.command.Command;
 import net.dv8tion.jda.api.EmbedBuilder;
 
 public class FightCommand extends Command {

src/main/java/com/github/nilstrieb/commands/fun/QuoteCommand.java

@@ -1,7 +1,7 @@
 package com.github.nilstrieb.commands.fun;
 
 import com.github.nilstrieb.cofig.Config;
-import com.github.nilstrieb.commands.handler.Command;
+import com.github.nilstrieb.core.command.Command;
 import com.github.nilstrieb.util.KilluaQuotes;
 import net.dv8tion.jda.api.EmbedBuilder;
 import net.dv8tion.jda.api.entities.MessageEmbed;

src/main/java/com/github/nilstrieb/commands/fun/SayCommand.java

@@ -1,7 +1,6 @@
 package com.github.nilstrieb.commands.fun;
 
-import com.github.nilstrieb.commands.handler.Command;
+import com.github.nilstrieb.core.command.Command;
-import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
 
 public class SayCommand extends Command {
     public SayCommand(){

src/main/java/com/github/nilstrieb/commands/fun/trivia/TriviaApproval.java

@@ -1,8 +1,8 @@
 package com.github.nilstrieb.commands.fun.trivia;
 
 import com.github.nilstrieb.cofig.Config;
-import com.github.nilstrieb.reactions.ReactionAdapter;
+import com.github.nilstrieb.core.reactions.ReactionAdapter;
-import com.github.nilstrieb.reactions.ReactionEventManager;
+import com.github.nilstrieb.core.reactions.ReactionEventManager;
 import com.github.nilstrieb.util.ConsoleColors;
 import com.github.nilstrieb.util.trivia.TriviaQuestion;
 import com.github.nilstrieb.util.trivia.TriviaQuestionData;

src/main/java/com/github/nilstrieb/commands/fun/trivia/TriviaCommand.java

@@ -1,8 +1,8 @@
 package com.github.nilstrieb.commands.fun.trivia;
 
 import com.github.nilstrieb.cofig.Config;
-import com.github.nilstrieb.commands.handler.Command;
+import com.github.nilstrieb.core.command.Command;
-import com.github.nilstrieb.sections.Section;
+import com.github.nilstrieb.core.sections.Section;
 import com.github.nilstrieb.util.ConsoleColors;
 import com.github.nilstrieb.util.trivia.TriviaQuestion;
 import com.github.nilstrieb.util.trivia.TriviaQuestionData;

src/main/java/com/github/nilstrieb/commands/handler/MessageSender.java

@@ -1,65 +0,0 @@
-package com.github.nilstrieb.commands.handler;
-
-import com.github.nilstrieb.util.MultiPageEmbed;
-import net.dv8tion.jda.api.entities.MessageEmbed;
-import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
-
-import java.util.Timer;
-import java.util.TimerTask;
-
-public abstract class MessageSender {
-
-    protected MessageReceivedEvent event;
-
-    public void onMessageReceived(MessageReceivedEvent event, String args){
-        this.event = event;
-        called(args);
-    }
-
-
-    /**
-     * The method called by the CommandHandler
-     * @param args The arguments (after the command and an optional whitespace)
-     */
-    public abstract void called(String args);
-
-
-    protected void reply(String message) {
-        if (!message.equals("")) {
-            event.getTextChannel().sendMessage(message).queue();
-        }
-    }
-
-    protected void reply(MessageEmbed embed) {
-        if (!embed.isEmpty()) {
-            event.getTextChannel().sendMessage(embed).queue();
-        }
-    }
-
-    protected void reply(MessageEmbed... embeds) {
-        if (!embeds[0].isEmpty()) {
-            new MultiPageEmbed(event, embeds);
-        }
-    }
-
-    protected void reply(String emote1, String emote2, MessageEmbed... embeds) {
-        if (!embeds[0].isEmpty()) {
-            new MultiPageEmbed(event, emote1, emote2, embeds);
-        }
-    }
-
-    protected void deleteMsg(long delay) {
-        new Timer().schedule(
-                new TimerTask() {
-                    @Override
-                    public void run() {
-                        event.getMessage().delete().queue();
-                    }
-                }, delay
-        );
-    }
-
-    protected void deleteMsg() {
-        event.getMessage().delete().queue();
-    }
-}

src/main/java/com/github/nilstrieb/commands/info/EvalCommand.java

@@ -1,7 +1,7 @@
 package com.github.nilstrieb.commands.info;
 
 import com.github.nilstrieb.cofig.Config;
-import com.github.nilstrieb.commands.handler.Command;
+import com.github.nilstrieb.core.command.Command;
 import com.github.nilstrieb.util.trivia.TriviaQuestionData;
 import net.dv8tion.jda.api.EmbedBuilder;
 import net.dv8tion.jda.api.entities.Message;

src/main/java/com/github/nilstrieb/commands/info/HelpCommand.java

@@ -1,7 +1,7 @@
 package com.github.nilstrieb.commands.info;
 
-import com.github.nilstrieb.commands.handler.Command;
+import com.github.nilstrieb.core.command.Command;
-import com.github.nilstrieb.commands.handler.CommandHandler;
+import com.github.nilstrieb.core.command.CommandHandler;
 import net.dv8tion.jda.api.entities.MessageEmbed;
 
 public class HelpCommand extends Command {
@@ -12,14 +12,13 @@ public class HelpCommand extends Command {
     @Override
     public void called(String args) {
         if(args.length() == 0) {
-            if (CommandHandler.commandAmount() > CommandHandler.MAX_PAGE_LENGTH) {
+            if (CommandHandler.commandAmount() > CommandHandler.MAX_HELP_PAGE_LENGTH) {
-                reply(CommandHandler.getHelpLists(event));
+                reply(CommandHandler.getHelpLists());
-
             } else {
-                reply(CommandHandler.getHelpList(event).build());
+                reply(CommandHandler.getHelpList().build());
             }
         } else {
-            MessageEmbed help = CommandHandler.getCommandHelp(event, args.split(" ")[0]);
+            MessageEmbed help = CommandHandler.getCommandHelp(args.split(" ")[0]);
             if (help != null) {
                 reply(help);
             }

src/main/java/com/github/nilstrieb/commands/info/InviteCommand.java

@@ -1,7 +1,7 @@
 package com.github.nilstrieb.commands.info;
 
 import com.github.nilstrieb.cofig.Config;
-import com.github.nilstrieb.commands.handler.Command;
+import com.github.nilstrieb.core.command.Command;
 import net.dv8tion.jda.api.EmbedBuilder;
 import net.dv8tion.jda.api.entities.User;
 

src/main/java/com/github/nilstrieb/commands/info/ToukaCommand.java

@@ -1,7 +1,7 @@
 package com.github.nilstrieb.commands.info;
 
 import com.github.nilstrieb.cofig.Config;
-import com.github.nilstrieb.commands.handler.Command;
+import com.github.nilstrieb.core.command.Command;
 import net.dv8tion.jda.api.EmbedBuilder;
 import net.dv8tion.jda.api.entities.User;
 

src/main/java/com/github/nilstrieb/commands/util/EmoteAddCommand.java

@@ -1,7 +1,6 @@
 package com.github.nilstrieb.commands.util;
 
-import com.github.nilstrieb.commands.handler.Command;
+import com.github.nilstrieb.core.command.Command;
-import net.dv8tion.jda.api.JDA;
 import net.dv8tion.jda.api.Permission;
 import net.dv8tion.jda.api.entities.Icon;
 import net.dv8tion.jda.api.entities.Member;

src/main/java/com/github/nilstrieb/core/Main.java

@@ -13,9 +13,9 @@ import com.github.nilstrieb.commands.info.EvalCommand;
 import com.github.nilstrieb.commands.info.HelpCommand;
 import com.github.nilstrieb.commands.info.ToukaCommand;
 import com.github.nilstrieb.commands.util.EmoteAddCommand;
-import com.github.nilstrieb.listener.ChannelMessageListener;
+import com.github.nilstrieb.core.sections.ChannelMessageListener;
-import com.github.nilstrieb.listener.CommandListener;
+import com.github.nilstrieb.core.command.CommandListener;
-import com.github.nilstrieb.listener.ReactionEventListener;
+import com.github.nilstrieb.core.reactions.ReactionEventListener;
 import com.github.nilstrieb.listener.StartUpListener;
 import net.dv8tion.jda.api.JDA;
 import net.dv8tion.jda.api.JDABuilder;

src/main/java/com/github/nilstrieb/core/command/Command.java

@@ -1,14 +1,17 @@
-package com.github.nilstrieb.commands.handler;
+package com.github.nilstrieb.core.command;
 
 import com.github.nilstrieb.cofig.Config;
 
+/**
+ * The base command class. Every command should extend this class.
+ */
 public abstract class Command extends MessageSender{
     private final String name;
     private final String description;
     private final String exampleUsage;
     private final String arguments;
     private final String detailDescription;
-    private final CommandParser parser = CommandParser.getInstance();
+    private final CommandParser parser = new CommandParser();
 
 
     /**

src/main/java/com/github/nilstrieb/core/command/CommandHandler.java

@@ -1,21 +1,32 @@
-package com.github.nilstrieb.commands.handler;
+package com.github.nilstrieb.core.command;
 
 import com.github.nilstrieb.cofig.Config;
 import com.github.nilstrieb.util.ConsoleColors;
 import net.dv8tion.jda.api.EmbedBuilder;
 import net.dv8tion.jda.api.entities.MessageEmbed;
-import net.dv8tion.jda.api.events.Event;
 import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
 
 import java.util.*;
 
+/**
+ * The CommandHandler handles everything about the commands
+ */
 public class CommandHandler {
 
-    public static final int MAX_PAGE_LENGTH = 10;
+    public static final int MAX_HELP_PAGE_LENGTH = 10;
+
     private static final Map<String, Command> commands = new HashMap<>();
     private static final Map<String, Command> hiddenCommands = new HashMap<>();
-    private static final CommandParser parser = CommandParser.getInstance();
 
+    private static final CommandParser parser = new CommandParser();
+
+    /**
+     * Add a new command to the handler. This is normally done by the{@code Command}.
+     *
+     * @param key    The key (command name)
+     * @param cmd    The command object
+     * @param hidden Whether the command should be shown on the help page
+     */
     public static void addCommand(String key, Command cmd, boolean hidden) {
         if (hidden) {
             hiddenCommands.put(key, cmd);
@@ -28,7 +39,12 @@ public class CommandHandler {
         commands.put(key, cmd);
     }
 
-    public static void call(MessageReceivedEvent event) {
+    /**
+     * This method is called by the{@code CommandListener}
+     *
+     * @param event The {@code MessageReceivedEvent}
+     */
+    static void call(MessageReceivedEvent event) {
         if (event.getMessage().getContentRaw().toLowerCase().startsWith(Config.PREFIX)) {
             String[] split = parser.splitOffCommandName(event.getMessage().getContentRaw());
             String command = split[0];
@@ -45,7 +61,12 @@ public class CommandHandler {
         return commands.size();
     }
 
-    public static EmbedBuilder getHelpList(Event event) {
+    /**
+     * Get the list of all commands, on one page.
+     * May lead to problems if there are too many commands.
+     * @return The page
+     */
+    public static EmbedBuilder getHelpList() {
         EmbedBuilder builder = Config.getDefaultEmbed();
         builder.setTitle("Killua help");
         for (Command s : commands.values()) {
@@ -54,17 +75,21 @@ public class CommandHandler {
         return builder;
     }
 
-    public static MessageEmbed[] getHelpLists(Event event) {
+    /**
+     * Get a list of all commands, spread over different pages
+     * @return The pages
+     */
+    public static MessageEmbed[] getHelpLists() {
 
         int length = commands.size();
-        int pages = length / MAX_PAGE_LENGTH + 1;
+        int pages = length / MAX_HELP_PAGE_LENGTH + 1;
         EmbedBuilder[] builders = new EmbedBuilder[pages];
 
 
         int i = 0, j = 0;
         EmbedBuilder builder = null;
         for (Command value : commands.values()) {
-            if (i % MAX_PAGE_LENGTH == 0) {
+            if (i % MAX_HELP_PAGE_LENGTH == 0) {
                 builder = Config.getDefaultEmbed();
                 builder.setTitle("Killua help");
                 builders[j] = builder;
@@ -82,15 +107,19 @@ public class CommandHandler {
         return messageEmbeds;
     }
 
-    public static MessageEmbed getCommandHelp(Event event, String command) {
+    /**
+     * Returns the help page for a single command
+     * @param command The command name
+     * @return The help page
+     */
+    public static MessageEmbed getCommandHelp(String command) {
         Command cmd = commands.get(command);
         if (cmd != null) {
             EmbedBuilder builder = Config.getDefaultEmbed()
                     .setTitle("Killua help: " + cmd.getName())
                     .addField("Name", cmd.getName(), true)
-                    .addField("Description", cmd.getDescription(), true)
+                    .addField("Description:", cmd.getDetailDescription(), true)
-                    .addField("Example usage", "`" + cmd.getExampleUsage() + "`", true)
+                    .addField("Example usage", "`" + cmd.getExampleUsage() + "`", true);
-                    .addField("Detail:", cmd.getDetailDescription(), true);
 
             if (!cmd.getArguments().equals("")) {
                 builder.addField("Arguments", "`" + cmd.getArguments() + "`", true);

src/main/java/com/github/nilstrieb/core/command/CommandListener.java

@@ -1,6 +1,6 @@
-package com.github.nilstrieb.listener;
+package com.github.nilstrieb.core.command;
 
-import com.github.nilstrieb.commands.handler.CommandHandler;
+import com.github.nilstrieb.core.command.CommandHandler;
 import com.github.nilstrieb.util.ConsoleColors;
 import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
 import net.dv8tion.jda.api.hooks.ListenerAdapter;

src/main/java/com/github/nilstrieb/core/command/CommandParser.java

@@ -1,21 +1,21 @@
-package com.github.nilstrieb.commands.handler;
+package com.github.nilstrieb.core.command;
 
 import com.github.nilstrieb.cofig.Config;
 
+/**
+ * A parser for parsing commands
+ */
 public class CommandParser {
 
-    private static final CommandParser parser = new CommandParser();
-
-    private CommandParser() {}
-
-    public static CommandParser getInstance() {
-        return parser;
-    }
-
     public static String[] splitArgs(String args){
         return args.split(" ");
     }
 
+    /**
+     * Split the full message into command name + args
+     * @param contentRaw The full message (including prefix!)
+     * @return a String array where [0] is the command name and [1] are the args (the text after the name + an optional space)
+     */
     public String[] splitOffCommandName(String contentRaw) {
         String[] returns = new String[2];
         String beheaded = contentRaw.substring(Config.PREFIX.length());

src/main/java/com/github/nilstrieb/core/command/MessageSender.java

@@ -0,0 +1,107 @@
+package com.github.nilstrieb.core.command;
+
+import com.github.nilstrieb.core.util.MultiPageEmbed;
+import net.dv8tion.jda.api.entities.MessageEmbed;
+import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
+
+import java.util.Timer;
+import java.util.TimerTask;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * An abstract class for classes that interact with the chat.
+ * Removes all the boilerplate code associated with sending messages over JDA
+ */
+public abstract class MessageSender {
+
+    protected MessageReceivedEvent event;
+
+    /**
+     * Called by the specific handler.
+     *
+     * @param event The MessageReceivedEvent
+     * @param args  The arguments
+     */
+    public void onMessageReceived(MessageReceivedEvent event, String args) {
+        this.event = event;
+        called(args);
+    }
+
+
+    /**
+     * This method gets called by this object after the MessageReceivedEvent has been saved.
+     *
+     * @param args The arguments/text of the sent message
+     */
+    public abstract void called(String args);
+
+    /**
+     * Send a simple String message to the chat the original message came from.
+     * Equivalent to {@code event.getTextChannel().sendMessage(message).queue();}
+     * Will not send empty Strings.
+     *
+     * @param message The message
+     */
+    protected void reply(String message) {
+        if (!message.isEmpty()) {
+            event.getTextChannel().sendMessage(message).queue();
+        }
+    }
+
+    /**
+     * Send a simple embed message to the chat original message came from.
+     * Equivalent to {@code event.getTextChannel().sendMessage(embed).queue();}
+     * Will not send empty Embeds
+     *
+     * @param embed The embed
+     */
+    protected void reply(MessageEmbed embed) {
+        if (!embed.isEmpty()) {
+            event.getTextChannel().sendMessage(embed).queue();
+        }
+    }
+
+    /**
+     * Send multiple embeds in one message message as a {@code MultiPageEmbed} to the chat original message came from.
+     * Equivalent to {@code new MultiPageEmbed(event, embeds);}
+     * Will not send empty Embeds
+     *
+     * @param embeds The embeds
+     */
+    protected void reply(MessageEmbed... embeds) {
+        if (!embeds[0].isEmpty()) {
+            new MultiPageEmbed(event, embeds);
+        }
+    }
+
+    /**
+     * Send multiple embeds in one message message as a {@code MultiPageEmbed} to the chat original message came from.
+     * Equivalent to {@code new MultiPageEmbed(event, embeds);}
+     * Will not send empty Embeds
+     *
+     * @param embeds The embeds
+     * @param emote1 The emote for scrolling to the left
+     * @param emote2 The emote for scrolling to the right
+     */
+    protected void reply(String emote1, String emote2, MessageEmbed... embeds) {
+        if (!embeds[0].isEmpty()) {
+            new MultiPageEmbed(event, emote1, emote2, embeds);
+        }
+    }
+
+    /**
+     * Delete the original message after a specific delay in s.
+     *
+     * @param delay The delay in s
+     */
+    protected void deleteMsg(long delay) {
+        event.getMessage().delete().queueAfter(delay, TimeUnit.SECONDS);
+    }
+
+    /**
+     * Delete the original message after a specific delay in ms.
+     */
+    protected void deleteMsg() {
+        event.getMessage().delete().queue();
+    }
+}

src/main/java/com/github/nilstrieb/core/reactions/ReactionAdapter.java

@@ -1,25 +1,43 @@
-package com.github.nilstrieb.reactions;
+package com.github.nilstrieb.core.reactions;
 
 import net.dv8tion.jda.api.events.message.react.MessageReactionAddEvent;
 import net.dv8tion.jda.api.events.message.react.MessageReactionRemoveEvent;
 
+/**
+ * The adapter for the ReactionListener
+ */
 public abstract class ReactionAdapter implements ReactionListener {
 
     private long message;
 
+    /**
+     * This method has to be called with the message ID
+     * @param message The message ID
+     */
     protected void create(long message) {
         this.message = message;
         ReactionEventManager.addMessage(message, this);
     }
 
+    /**
+     * This method can be called to remove the Listener class from the Handlerr
+     */
     protected void dispose() {
         ReactionEventManager.removeMessage(message);
     }
 
+    /**
+     * This method gets called from the Handler after a reaction is added to this message
+     * @param event The event
+     */
     @Override
     public void onReactionAdded(MessageReactionAddEvent event) {
     }
 
+    /**
+     * This method gets called from the Handler after a reaction is removed to this message
+     * @param event The event
+     */
     @Override
     public void onReactionRemoved(MessageReactionRemoveEvent event) {
     }
@@ -27,8 +45,4 @@ public abstract class ReactionAdapter implements ReactionListener {
     public long getMessage() {
         return message;
     }
-
-    public void setMessage(long message) {
-        this.message = message;
-    }
 }

src/main/java/com/github/nilstrieb/core/reactions/ReactionEventListener.java

@@ -1,13 +1,10 @@
-package com.github.nilstrieb.listener;
+package com.github.nilstrieb.core.reactions;
 
-import com.github.nilstrieb.reactions.ReactionEventManager;
 import net.dv8tion.jda.api.events.message.react.MessageReactionAddEvent;
 import net.dv8tion.jda.api.events.message.react.MessageReactionRemoveEvent;
 import net.dv8tion.jda.api.hooks.ListenerAdapter;
 import org.jetbrains.annotations.NotNull;
 
-import java.util.Objects;
-
 public class ReactionEventListener extends ListenerAdapter {
     @Override
     public void onMessageReactionAdd(@NotNull MessageReactionAddEvent event) {

src/main/java/com/github/nilstrieb/core/reactions/ReactionEventManager.java

@@ -1,4 +1,4 @@
-package com.github.nilstrieb.reactions;
+package com.github.nilstrieb.core.reactions;
 
 import com.github.nilstrieb.util.ConsoleColors;
 import net.dv8tion.jda.api.events.message.react.MessageReactionAddEvent;

src/main/java/com/github/nilstrieb/core/reactions/ReactionListener.java

@@ -1,4 +1,4 @@
-package com.github.nilstrieb.reactions;
+package com.github.nilstrieb.core.reactions;
 
 import net.dv8tion.jda.api.events.message.react.MessageReactionAddEvent;
 import net.dv8tion.jda.api.events.message.react.MessageReactionRemoveEvent;

src/main/java/com/github/nilstrieb/core/sections/ChannelListener.java

@@ -1,4 +1,4 @@
-package com.github.nilstrieb.sections;
+package com.github.nilstrieb.core.sections;
 
 import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
 

src/main/java/com/github/nilstrieb/core/sections/ChannelMessageEventManager.java

@@ -1,4 +1,4 @@
-package com.github.nilstrieb.sections;
+package com.github.nilstrieb.core.sections;
 
 
 import com.github.nilstrieb.util.ConsoleColors;
@@ -26,9 +26,12 @@ public class ChannelMessageEventManager {
 
     public static void onMessageReceived(MessageReceivedEvent event) {
         long id = event.getTextChannel().getIdLong();
+        //if the message is relevant
         if (listeners.containsKey(id)) {
             System.out.println(ConsoleColors.YELLOW + "[ChannelMsgEvtMgr 30] Message in listened channel " +
                     event.getTextChannel().getName() + " by " + event.getAuthor().getAsTag() + ": " + event.getMessage().getContentRaw() + ConsoleColors.RESET);
+
+            //notify all listeners
             List<ChannelListener> list = listeners.get(id);
             for (ChannelListener channelListener : list) {
                 if (channelListener.getUserID() == 0) {
@@ -38,16 +41,21 @@ public class ChannelMessageEventManager {
                 }
             }
 
+            //remove the listeners that got removed during the calling
             for (ChannelListener channelListener : removeBuffer) {
                 listeners.get(channelListener.getChannelID()).remove(channelListener);
                 removedChannels.add(channelListener.getChannelID());
             }
+
+            //remove the channels if all listeners for that channel have been removed
             for (Long removedChannel : removedChannels) {
                 list = listeners.get(removedChannel);
                 if (list.isEmpty()) {
                     listeners.remove(removedChannel);
                 }
             }
+
+            //clear the buffers
             removedChannels.clear();
             removeBuffer.clear();
         }

src/main/java/com/github/nilstrieb/core/sections/ChannelMessageListener.java

@@ -1,6 +1,5 @@
-package com.github.nilstrieb.listener;
+package com.github.nilstrieb.core.sections;
 
-import com.github.nilstrieb.sections.ChannelMessageEventManager;
 import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
 import net.dv8tion.jda.api.hooks.ListenerAdapter;
 import org.jetbrains.annotations.NotNull;

src/main/java/com/github/nilstrieb/core/sections/Section.java

@@ -1,12 +1,20 @@
-package com.github.nilstrieb.sections;
+package com.github.nilstrieb.core.sections;
 
-import com.github.nilstrieb.commands.handler.MessageSender;
+import com.github.nilstrieb.core.command.MessageSender;
 import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
 
+/**
+ * The section class can be extended to create sections where the user is asked to write multiple messages
+ */
 public abstract class Section extends MessageSender implements ChannelListener{
     private final long textChannelID;
     private final long userID;
 
+    /**
+     * Create a new section for a specific user
+     * @param textChannelID The channel ID
+     * @param userID The user ID
+     */
     public Section(long textChannelID, long userID) {
         this.textChannelID = textChannelID;
         this.userID = userID;
@@ -14,17 +22,24 @@ public abstract class Section extends MessageSender implements ChannelListener{
         ChannelMessageEventManager.addListener(this, textChannelID);
     }
 
+    /**
+     * Create a new section for all users in a channel
+     * @param textChannelID The channel ID
+     */
+    public Section(long textChannelID) {
+        this.textChannelID = textChannelID;
+        this.userID = 0;
+    }
+
     @Override
     public void messageReceived(MessageReceivedEvent event) {
         this.event = event;
         called(event.getMessage().getContentRaw());
     }
 
-    public Section(long textChannelID) {
+    /**
-        this.textChannelID = textChannelID;
+     * End the section.
-        this.userID = 0;
+     */
-    }
-
     protected void dispose(){
         ChannelMessageEventManager.removeListener(this);
     }

src/main/java/com/github/nilstrieb/core/util/MultiPageEmbed.java

@@ -1,6 +1,6 @@
-package com.github.nilstrieb.util;
+package com.github.nilstrieb.core.util;
 
-import com.github.nilstrieb.reactions.ReactionAdapter;
+import com.github.nilstrieb.core.reactions.ReactionAdapter;
 import net.dv8tion.jda.api.entities.Message;
 import net.dv8tion.jda.api.entities.MessageEmbed;
 import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
@@ -8,6 +8,9 @@ import net.dv8tion.jda.api.events.message.react.MessageReactionAddEvent;
 
 import java.util.Objects;
 
+/**
+ * This class sends a message to the channel in the event that contains multiple pages that can be navigated using reactinos
+ */
 public class MultiPageEmbed extends ReactionAdapter {
     private static final String NEXT_PAGE_DEFAULT_REACTION = "\u25b6\ufe0f";
     private static final String PREVIOUS_PAGE_DEFAULT_REACTION = "\u25c0\ufe0f";
@@ -19,10 +22,22 @@ public class MultiPageEmbed extends ReactionAdapter {
     private final String nextReaction;
 
 
+    /**
+     * Create a new MultiPageEmbed with the default emotes
+     *
+     * @param event The event
+     * @param pages The pages
+     */
     public MultiPageEmbed(MessageReceivedEvent event, MessageEmbed... pages) {
         this(event, PREVIOUS_PAGE_DEFAULT_REACTION, NEXT_PAGE_DEFAULT_REACTION, pages);
     }
 
+    /**
+     * Create a new MultiPageEmbed with custom emotes
+     *
+     * @param event The event
+     * @param pages The pages
+     */
     public MultiPageEmbed(MessageReceivedEvent event, String prevReaction, String nextReaction, MessageEmbed[] pages) {
         this.prevReaction = prevReaction;
         this.nextReaction = nextReaction;
@@ -53,7 +68,10 @@ public class MultiPageEmbed extends ReactionAdapter {
                 }
             }
         }
-        Objects.requireNonNull(event.getUser(), "Reaction user was null");
+        if (event.getUser() != null) {
-        event.getReaction().removeReaction(event.getUser()).queue();
+            event.getReaction().removeReaction(event.getUser()).queue();
+        } else {
+            System.err.println("[MultiPageEmbed] Reaction user was null");
+        }
     }
 }