PlayerListItem playerListItem = new PlayerListItem();
PlayerListItem.Item item = new PlayerListItem.Item();

playerListItem.setAction(PlayerListItem.Action.

item.setPing(player.getPing());
item.setGamemode(((UserConnection) player).getGamemode());
item.setUuid(player.getUniqueId());
item.setUsername(ChatColor.YELLOW + player.getDisplayName());

LoginResult loginResult = ((UserConnection) player).getPendingConnection().getLoginProfile();
String[][] props = new String[loginResult.getProperties().length][];

for(int i = 0; i < props.length; i++)
{
	props[i] = new String[]
        {
        	loginResult.getProperties()[i].getName(),
                loginResult.getProperties()[i].getValue(),
                loginResult.getProperties()[i].getSignature()
        };
}

item.setProperties(props);
playerListItem.setItems(new PlayerListItem.Item[]{item});

player.unsafe().sendPacket(playerListItem);