Singleton example - With example usage for accessing a JavaPlugin/Plugin

LivesManager.java

import java.io.File;
import java.io.IOException;

import org.bukkit.configuration.file.FileConfiguration;
import org.bukkit.configuration.file.YamlConfiguration;
import org.bukkit.plugin.Plugin;

public class LivesManager {
	
	private LivesManager(){}
    private static LivesManager instance = new LivesManager();
    public static LivesManager getInstance() { return instance; }
    
    
    private File livesFile;
    private FileConfiguration lives;
    
    public void init(Plugin p){
    	livesFile = new File(p.getDataFolder() + File.separator + "lives.yml");
    	
    	if(!p.getDataFolder().exists()){
    		p.getDataFolder().mkdirs();
    	}
    	if(!livesFile.exists())
			try {
				livesFile.createNewFile();
			} catch (IOException e) {
				e.printStackTrace();
			}
    	
    	lives = YamlConfiguration.loadConfiguration(livesFile);
    }
    
    public FileConfiguration getLivesConfig(){
    	return this.lives;
    }
    
   
}