Player player = Bukkit.getPlayer("player_name"); player.sendMessage("Hello, welcome to the server!");In this example, we first obtain the Player object for the player we want to send a message to. We then call the sendMessage() method on that player object and pass in the message we want to send. The package library for Player.sendMessage() is part of the Bukkit API, which is a popular library for Minecraft server plugins. The specific class that contains this method is org.bukkit.entity.Player.