XConfiguration 2.0.2

@Getter
public class MessagesConfiguration
extends Configuration
{
  public MessagesConfiguration(File folder)
  {
      super(folder.getAbsolutePath() + File.separator + "messages.yml");
  }

  @ConfigurationField("Hello-world")
  public String helloWorld = "Hello, world!";
}

public class Main
extends JavaPlugin
{
    /*
    * Creating an instance of our configuration class
    */
    private MessagesConfiguration messagesConfiguration = new MessagesConfiguration(this.getDataFolder());

    @Override
    public void onEnable()
    {
        /*
        * This method automatically creates a configuration file
        * if it has not already been created. Also, it fills your class
        * with values from the configuration, or vice versa fills the
        * configuration with values from the class if there are no
        * corresponding fields in the configuration.
        *
        * You can also call this method when you want to reload
        * the configuration of your plugin.
        */
        this.messagesConfiguration.load();

        /*
        * After loading the configuration, we can easily get
        * the values of our fields from the class.
        */
        this.getLogger().info(this.messagesConfiguration.getHelloWorld());
    }

    @Override
    public void onDisable()
    {
        this.messagesConfiguration = null;
    }
}

@Getter
public class MessagesConfiguration
extends Configuration
{
    public MessagesConfiguration(File folder)
    {
        super(folder.getAbsolutePath() + File.separator + "messages.yml");
    }

  @ConfigurationField("Hello-world.With-comment-above")
  @ConfigurationComments({"# First comment line", "# Second comment line"})
  public String helloWorld = "Hello, world!";
}

# First comment line
# Second comment line
Hello-world:
  With-comment-above: Hello, world!