Development Assistance Confused on Error

If you've ever looked in my signature, I have my public plugins (currently one) that are displayed. So, in version "1.0.7" of my plugin, I added a /OPList command, showing all online operators, and all operators in the operator file that comes with Bukkit. I've tested this command quite extensively, and it works perfectly on 1.7.9. I uploaded this version to BukkitDev a few days ago and it seems to have worked fine. However, I've received a ticket from a person who says it does not work (he's using Spigot 1.8). He's sent me the error (http://gyazo.com/75b4b1930af01c7aa13f4041a7f37527) and it obviously says that it cannot cast a "CraftOfflinePlayer" to a "Player". I have checked my code, however, I do not see why this would be showing up. Here's the code:

Code:java

package com.GummyPvP.AdminEssentials.Commands;
 
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.OfflinePlayer;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
 
public class OPList implements CommandExecutor {
 
    @Override
    public boolean onCommand(CommandSender sender, Command cmd, String arg2,
            String[] args) {
        if (cmd.getName().equalsIgnoreCase("OPList")) {
 
            StringBuilder sb = new StringBuilder();
            StringBuilder onlineSB = new StringBuilder();
 
            sender.sendMessage(ChatColor.BLUE + "" + ChatColor.STRIKETHROUGH
                    + "----" + ChatColor.GOLD + " OPList " + ChatColor.BLUE
                    + "" + ChatColor.STRIKETHROUGH + "----");
            sender.sendMessage("");
            sender.sendMessage(ChatColor.GREEN + "Online Operators:");
            for (OfflinePlayer offlineops : Bukkit.getOperators()) {
                if (offlineops.isOnline()) {
                    Player onlineops = (Player) offlineops;
                    onlineSB.append(onlineops.getName() + ", ");
                }
            }
 
            String list = onlineSB.toString();
            Pattern oPattern = Pattern.compile(", $");
            Matcher oMatcher = oPattern.matcher(list);
            list = oMatcher.replaceAll("");
 
            sender.sendMessage(ChatColor.AQUA + list);
 
            sender.sendMessage("");
            sender.sendMessage(ChatColor.BLUE + "" + ChatColor.STRIKETHROUGH
                    + "----------------");
            sender.sendMessage("");
            sender.sendMessage(ChatColor.RED + "All Operators:");
            for (OfflinePlayer offline : Bukkit.getOperators()) {
                sb.append(offline.getName() + ", ");
            }
 
            String playerList = sb.toString();
            Pattern pattern = Pattern.compile(", $");
            Matcher matcher = pattern.matcher(playerList);
            playerList = matcher.replaceAll("");
 
            sender.sendMessage(ChatColor.GOLD + playerList);
 
        }
        return true;
    }
 
}
 

The code is a bit sloppy, I do know, and I intend to recode it, however, I cannot do this until I am for sure there are no bugs in it.

 

Googlelover1234
Line 31. Operators that are offline can't be cast to Player. Make sure to check if the offline player .isOnline() before casting.

 

xTrollxDudex
I did, look at the line above it.

 

There is a getPlayer() method for OfflinePlayer.

 

I'm guessing so, not sure.

Alright, will test, thanks!