YAML file reading, writing, saving, and loading?

Can somebody give a quick run-through on how to make editable YML files that can be edited through methods and not just though the file. I do NOT want config file methods.

I need to be able to save all players to a list, and change a value set to their name (string or integer will work, not boolean).

If anyone would take the time to help me it would be greatly appreciated as I could not get it working for a few hours now.

 

Code:java

 
File playersConfigFile;
FileConfiguration playersConfig;
 
playersConfigFile = new File(getDataFolder(), "players.yml");
playersConfig = YamlConfiguration.loadConfiguration(playersConfigFile);
 
if(!event.getPlayer().hasPlayedBefore()) //If the player hasnt played before (read)
            {
                plugin.playersConfig.set("Players.Score." + event.getPlayer().getDisplayName(), 0); //Create their name in the config file and set their score to 0 (write)
                try {
                    plugin.playersConfig.save(plugin.playersConfigFile); //Save the file
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
 

Thats what i have, however ill probably move where it saves to a different location .

 

Okay, I did most of that, i'll try it again. (Tomorrow, it's almost 4:00pm here.)

 

I keep a global hashmap of all the different configs I use:

HashMap<String,YamlConfiguration> configs = new HashMap<String,YamlConfiguration>();

Then I have some helper methods that let me interface with them:

Code:

YamlConfiguration config(String configName) {
    if (!configs.containsKey(configName)) configs.put(configName, YamlConfiguration.loadConfiguration(new File(getDataFolder(), configName + ".yml")));
    return configs.get(configName);
}

^--- with this I call config("myconfig1").set(field, value) or .getString or .getBoolean or any of the other config methods you can use on the default config

Code:

boolean saveConfig(String configName) {
if (!configs.containsKey(configName)) configs.put(configName, YamlConfiguration.loadConfiguration(new File(getDataFolder(), configName + ".yml")));
try { configs.get(configName).save(new File(getDataFolder(), configName + ".yml")); return true; }
catch (IOException e) { log.severe("IO Error while saving file '" + configName + ".yml' to plugin data folder."); e.printStackTrace(); return false; }
}

^--- with this I call saveConfig("myconfig1") to write the changes to disk

 

I keep getting this error upon starting the server:

Code:

2012-07-27 15:33:50 [SEVERE] java.lang.NullPointerException
2012-07-27 15:33:50 [SEVERE]at me.XboxNoLifes.QuantumRewards.QuantumRewards.loadYamls(QuantumRewards.java:59)
2012-07-27 15:33:50 [SEVERE]at me.XboxNoLifes.QuantumRewards.QuantumRewards.onEnable(QuantumRewards.java:46)
2012-07-27 15:33:50 [SEVERE]at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:215)
2012-07-27 15:33:50 [SEVERE]at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:337)
2012-07-27 15:33:50 [SEVERE]at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:386)
2012-07-27 15:33:50 [SEVERE]at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:264)
2012-07-27 15:33:50 [SEVERE]at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:246)
2012-07-27 15:33:50 [SEVERE]at net.minecraft.server.MinecraftServer.t(MinecraftServer.java:387)
2012-07-27 15:33:50 [SEVERE]at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:374)
2012-07-27 15:33:50 [SEVERE]at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:208)
2012-07-27 15:33:50 [SEVERE]at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:438)
2012-07-27 15:33:50 [SEVERE]at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

Here is my code:

PHP:

package me.XboxNoLifes.QuantumRewards;
 
import java.io.File;
import java.io.IOException;
import java.util.logging.Logger;
 
import org.bukkit.ChatColor;
import org.bukkit.Material;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.configuration.file.FileConfiguration;
import org.bukkit.configuration.file.YamlConfiguration;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.EventPriority;
import org.bukkit.event.player.PlayerJoinEvent;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.PlayerInventory;
import org.bukkit.plugin.PluginDescriptionFile;
import org.bukkit.plugin.RegisteredServiceProvider;
import org.bukkit.plugin.java.JavaPlugin;
import net.milkbowl.vault.economy.Economy;
 
public class QuantumRewards extends JavaPlugin {
 
    final File file = new File(getDataFolder(), "completed.yml");
    final FileConfiguration completed = YamlConfiguration.loadConfiguration(file);
    public final Logger logger = Logger.getLogger("Minecraft");
    public static QuantumRewards plugin;
    public static Economy econ = null;
    public static FileConfiguration classcompleted;
 
    public void onDisable() {
        PluginDescriptionFile pdffile = this.getDescription();
        this.logger.info("[" + pdffile.getName() + "]" + " Version "
                + pdffile.getVersion() + " Has Been Disabled!!");
    }
 
    public void onEnable() {
        PluginDescriptionFile pdffile = this.getDescription();
        this.logger.info("[" + pdffile.getName() + "]" + " Version "
                + pdffile.getVersion() + " Has Been Enabled!");
        if (!setupEconomy()) {
            this.logger.severe("CANNOT SETUP VAULT ECONOMY!");
            }
        loadYamls();
    }
   
    public void saveYamls() {
        try {
            completed.save(file);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
   
    public void loadYamls() {
        try {
            completed.load(file);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
   
    private boolean setupEconomy() {
        if (getServer().getPluginManager().getPlugin("Vault") == null) {
            return false;
        }
        RegisteredServiceProvider<Economy> rsp = getServer().getServicesManager().getRegistration(Economy.class);
        if (rsp == null) {
            return false;
        }
        econ = rsp.getProvider();
        return econ != null;
    }
   
    @EventHandler(priority = EventPriority.NORMAL)
    public void onPlayerJoin(PlayerJoinEvent event) {
        Player player = event.getPlayer();
        String name = player.getName();
       
        if(player.hasPermission("Quantumrewards.iron") && !this.completed.contains(name)) {
            this.completed.set("Donators." + player.getName(), 0);
            saveYamls();
        }
    }
 
    public boolean onCommand(CommandSender sender, Command cmd,
            String commandLabel, String[] args) {
        Player player = (Player) sender;
        String pbal = sender.getName();
        if (commandLabel.equalsIgnoreCase("donorkit")) {
            if (args.length == 0) {
 
                // Command Menu
                player.sendMessage("Test");
            }
            else if (args.length >= 1) {
 
                if (args.length != 1) {
 
                    player.sendMessage(ChatColor.DARK_RED + "Usage: /donorkit reward");
 
                }
                if(args.length == 1) {
                    if(args[0].equalsIgnoreCase("reward")) {
                       
                if (player.hasPermission("Quantumrewards.iron")) {
 
                    ItemStack diamond = new ItemStack(Material.DIAMOND_BLOCK, 1);
                    ItemStack iron = new ItemStack(Material.IRON_BLOCK, 5);
                    ItemStack copper = new ItemStack(224, 5);
                    ItemStack tin = new ItemStack(224, 5, (short) 1);
                    PlayerInventory pi = player.getInventory();
                    pi.addItem(diamond);
                    pi.addItem(iron);
                    pi.addItem(copper);
                    pi.addItem(tin);
                    econ.depositPlayer(pbal, 100000);
                    double balance = econ.getBalance(pbal);
                    player.sendMessage(ChatColor.GREEN + "You now have $" + balance);
                }
 
                if (player.hasPermission("Quantumrewards.gold")) {
                   
                    ItemStack diamond = new ItemStack(Material.DIAMOND_BLOCK, 5);
                    ItemStack iron = new ItemStack(Material.IRON_BLOCK, 15);
                    ItemStack copper = new ItemStack(224, 15);
                    ItemStack tin = new ItemStack(224, 15, (short) 1);
                    ItemStack rs = new ItemStack(231, 320);
                    PlayerInventory pi = player.getInventory();
                    pi.addItem(diamond);
                    pi.addItem(iron);
                    pi.addItem(copper);
                    pi.addItem(tin);
                    pi.addItem(rs);
                    econ.depositPlayer(pbal, 300000);
                    double balance = econ.getBalance(pbal);
                    player.sendMessage(ChatColor.GREEN + "You now have $" + balance);
                }
 
                if (player.hasPermission("Quantumrewards.diamond")) {
                   
                        ItemStack diamond = new ItemStack(Material.DIAMOND_BLOCK, 15);
                    ItemStack iron = new ItemStack(Material.IRON_BLOCK, 30);
                    ItemStack copper = new ItemStack(224, 30);
                    ItemStack tin = new ItemStack(224, 30, (short) 1);
                    ItemStack rs = new ItemStack(231, 640);
                    PlayerInventory pi = player.getInventory();
                    pi.addItem(diamond);
                    pi.addItem(iron);
                    pi.addItem(copper);
                    pi.addItem(tin);
                    pi.addItem(rs);
                    econ.depositPlayer(pbal, 1000000);
                    double balance = econ.getBalance(pbal);
                    player.sendMessage(ChatColor.GREEN + "You now have $" + balance);
                }
 
                if (player.hasPermission("Quantumrewards.elite")) {
                   
                    ItemStack diamond = new ItemStack(Material.DIAMOND_BLOCK, 25);
                    ItemStack iron = new ItemStack(Material.IRON_BLOCK, 50);
                    ItemStack copper = new ItemStack(224, 50);
                    ItemStack tin = new ItemStack(224, 50, (short) 1);
                    ItemStack rs = new ItemStack(231, 1280);
                    ItemStack ns = new ItemStack(30148, 1, (short) 27);
                    PlayerInventory pi = player.getInventory();
                    pi.addItem(diamond);
                    pi.addItem(iron);
                    pi.addItem(copper);
                    pi.addItem(tin);
                    pi.addItem(rs);
                    pi.addItem(ns);
                    econ.depositPlayer(pbal, 1750000);
                    double balance = econ.getBalance(pbal);
                    player.sendMessage(ChatColor.GREEN + "You now have $" + balance);
                }
 
                if (player.hasPermission("Quantumrewards.boss")) {
 
                    ItemStack diamond = new ItemStack(Material.DIAMOND_BLOCK, 25);
                    ItemStack iron = new ItemStack(Material.IRON_BLOCK, 50);
                    ItemStack copper = new ItemStack(224, 50);
                    ItemStack tin = new ItemStack(224, 50, (short) 1);
                    ItemStack rs = new ItemStack(231, 1280);
                    ItemStack ns = new ItemStack(30148, 1, (short) 27);
                    PlayerInventory pi = player.getInventory();
                    pi.addItem(diamond);
                    pi.addItem(iron);
                    pi.addItem(copper);
                    pi.addItem(tin);
                    pi.addItem(rs);
                    pi.addItem(ns);
                    econ.depositPlayer(pbal, 1750000);
                    double balance = econ.getBalance(pbal);
                    player.sendMessage(ChatColor.GREEN + "You now have $" + balance);
                }
 
                if (player.hasPermission("Quantumrewards.vip")) {
 
                    ItemStack diamond = new ItemStack(Material.DIAMOND_BLOCK, 5);
                    ItemStack iron = new ItemStack(Material.IRON_BLOCK, 15);
                    ItemStack copper = new ItemStack(224, 15);
                    ItemStack tin = new ItemStack(224, 15, (short) 1);
                    ItemStack rs = new ItemStack(231, 320);
                    PlayerInventory pi = player.getInventory();
                    pi.addItem(diamond);
                    pi.addItem(iron);
                    pi.addItem(copper);
                    pi.addItem(tin);
                    pi.addItem(rs);
                    econ.depositPlayer(pbal, 300000);
                    double balance = econ.getBalance(pbal);
                    player.sendMessage(ChatColor.GREEN + "You now have $" + balance);
                }
                }
                }
            }
        }
 
        return false;
    }
 
}

Sorry for messy code, I'm still very new to Java Once I'm through this and a few other needed plugins, I'll be working on learning how to set up/organize plugins.

 

the error is on line 59 which if i'm not mistaken is: completed.load(file);

So either completed is null or file is null when it tries to run that

Maybe try moving your initialization of completed and file to onEnable, just before loadYamls() is called