Solved Command repeats itself in chat

Hi, I'm a super noob in Minecraft plugin coding - I just started less than a week ago. I'm currently following this tutorial, but everytime I type in a command in-game, the command I type in chat eg /hello repeats itself in chat. This also happens through the command line. There are some pictures to better explain.
How can I fix this? Is this related to the code itself, or the plugin.yml file? In case you were wondering, this was my code:

Code:

import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;

public class HandlingEvents extends JavaPlugin
{
    @Override
    public void onEnable()
    {
        getLogger().info("Plugin enabled!");
        new PlayerListener(this);
    }
   
    @Override
    public void onDisable()
    {
       
    }
   
    public boolean onCommand(CommandSender sender, Command cmd, String label, String args[])
    {
        if (cmd.getName().equalsIgnoreCase("hello"))
        {
            if (sender instanceof Player)
            {
                sender.sendMessage(ChatColor.BOLD.toString() + ChatColor.RED + "Hello " + ChatColor.GREEN + "World");
                sender.sendMessage(ChatColor.GREEN + "This is a player");
               
            }
            else
            {
                sender.sendMessage(ChatColor.GREEN + "This is a console");
               
            }
        }
        if (cmd.getName().equalsIgnoreCase("ab"))
        {
            if (sender instanceof Player)
            {
                Player player = (Player) sender;
                if (player.hasPermission("ab.broadcast"))
                {
                    if (args[0].equalsIgnoreCase("1"))
                    {
                        Bukkit.broadcastMessage(ChatColor.RED + "[" + ChatColor.AQUA + "PlayerJoinMessage" + ChatColor.RED + "]" + ChatColor.BOLD + ChatColor.GREEN + " Message 1");
                    }
                    else if (args[0].equalsIgnoreCase("2"))
                    {
                        Bukkit.broadcastMessage(ChatColor.RED + "[" + ChatColor.AQUA + "PlayerJoinMessage" + ChatColor.RED + "]" + ChatColor.BOLD + ChatColor.GREEN + " Message 2");
                       
                    }
                    else if (args[0].equalsIgnoreCase("3"))
                    {
                        Bukkit.broadcastMessage(ChatColor.RED + "[" + ChatColor.AQUA + "PlayerJoinMessage" + ChatColor.RED + "]" + ChatColor.BOLD + ChatColor.GREEN + " Message 3");
                       
                    }
                    else if (args[0].equalsIgnoreCase("4"))
                    {
                        Bukkit.broadcastMessage(ChatColor.RED + "[" + ChatColor.AQUA + "PlayerJoinMessage" + ChatColor.RED + "]" + ChatColor.BOLD + ChatColor.GREEN + " Message 4");
                       
                    }
                    else
                    {
                        sender.sendMessage(ChatColor.BLUE + "Usage: /ab <1,2,3,4>");
                    }
                   
                }
                else
                {
                    sender.sendMessage(ChatColor.BLUE + "You do NOT have permission sorry :(");
                }
            }
            else
            {
                sender.sendMessage(ChatColor.RED + "You need to be in-game to perform this command");
            }
        }
        return false;
    }

}

And this is my plugin.yml file:

Code:

name: PlayerJoinMessage
main: me.HandlingEvents
version: 2.0
commands:
   hello:
      description: Our first command!
      usage: /hello
   ab:
      description: Broadcasting!
      permission: ab.broadcast
      usage: /ab <1,2,3,4>

 

@Side8StarLite
If you return false in the onCommand method it shows you the usage. If you return true, it doesn't.

 

@Side8StarLite
A few things you should know:
-You don't need a "plugin enabled" message in your onEnable, it's done automatically
-You don't need an on disable if there is nothing in it, when would you ever have a need for an empty method that's never used?
-Return true when the command was a success or it's the end of the onCommand method, return false when the command was not a success, so the user knows the proper usage.

 

@Side8StarLite try removing the usage in the plugin.yml I had issues when creating my first plugin because of it.

 

Something thats not in the code which is a possibility is that in game you have /gamerule showCommands (somthin like that) true

 

Thanks for all your replies!