NullPointerException

Hey guys!
I got another problem :S, this time with calling a function from the main class...

Code:

2012-04-11 20:45:12 [SEVERE] Could not load 'plugins\HungerGames.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.ExceptionInInitializerError
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:150)
    at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:305)
    at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:230)
    at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:207)
    at org.bukkit.craftbukkit.CraftServer.<init>(CraftServer.java:183)
    at net.minecraft.server.ServerConfigurationManager.<init>(ServerConfigurationManager.java:53)
    at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:156)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:422)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
Caused by: java.lang.ExceptionInInitializerError
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Unknown Source)
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:139)
    ... 8 more
Caused by: java.lang.NullPointerException
    at net.iveserver.allgamer.HungerGames.TributeList.load(TributeList.java:110)
    at net.iveserver.allgamer.HungerGames.TributeList.<init>(TributeList.java:21)
    at net.iveserver.allgamer.HungerGames.HungerGames.<clinit>(HungerGames.java:20)
    ... 11 more

My main code is

Code:

package net.iveserver.allgamer.HungerGames;
 
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashSet;
import java.util.logging.Level;
import java.util.logging.Logger;
 
import org.bukkit.configuration.file.FileConfiguration;
import org.bukkit.configuration.file.YamlConfiguration;
import org.bukkit.entity.Player;
import org.bukkit.plugin.PluginDescriptionFile;
import org.bukkit.plugin.java.JavaPlugin;
 
 
public class HungerGames extends JavaPlugin
{
    public static HungerGames plugin;
      final private static TributeList tributelist = new TributeList(plugin); //line 20
      Logger log;
      public HashSet<Player> Frozen = new HashSet<Player>();
      public FileConfiguration config;
      private String pluginName;
      private FileConfiguration tributefile = null;
    private File customtributefile = null;
 
  public void onEnable()
  {
    PluginDescriptionFile yml = getDescription();
    this.log = getLogger();
    this.log.info("HungerGames has been Enabled");
    this.pluginName = yml.getName();
    this.config = getConfig();
    this.config.options().copyDefaults(true);
    this.getTributeFile().options().copyDefaults(true);
    getCommand("hg").setExecutor(new HungerGamesCommander(this));
    saveDefaultConfig();
    saveTributeFile();
    getServer().getPluginManager().registerEvents(new DeathListener(this), this);
  }
 
  public void onDisable() {
    this.log = getLogger();
    this.log.info("HungerGames has been Disabled");
  }
    public void reloadTributeFile() {
        if (customtributefile == null) {
        customtributefile = new File(getDataFolder(), "tributes.yml");
        }
        tributefile = YamlConfiguration.loadConfiguration(customtributefile);
 
        // Look for defaults in the jar
        InputStream defConfigStream = getResource("tributes.yml");
        if (defConfigStream != null) {
            YamlConfiguration defConfig = YamlConfiguration.loadConfiguration(defConfigStream);
            tributefile.setDefaults(defConfig);
        }
    }
 
    public FileConfiguration getTributeFile() {
        if (tributefile == null) {
            reloadTributeFile();
        }
        return tributefile;
    }
 
    public void saveTributeFile() {
        if (tributefile == null || customtributefile == null) {
        return;
        }
        try {
            tributefile.save(customtributefile);
        } catch (IOException ex) {
            Logger.getLogger(JavaPlugin.class.getName()).log(Level.SEVERE, "Could not save config to " + customtributefile, ex);
        }
    }
 
  public void log(String message)
  {
    this.log.info("[" + this.pluginName + "] " + message);
  }
  public static TributeList getTributeList()
  {
  return tributelist;
  }
 
  }

And this is part of the class that wants to call it:

Code:

package net.iveserver.allgamer.HungerGames;
 
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.text.ParseException;
import org.bukkit.ChatColor;
import org.bukkit.Material;
import org.bukkit.Server;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.configuration.file.FileConfiguration;
 
 
 
public class TributeList extends JavaPlugin {
    private ArrayList<Tribute> Tributes = new ArrayList<Tribute>();
    HungerGames plugin;
      TributeList(HungerGames instance) {
          this.plugin = instance;
          load(); //line 21
          }
/*   
 
...
 
    public void load() {
        FileConfiguration tributefile = plugin.getTributeFile(); //line 110
        SimpleDateFormat format = new SimpleDateFormat("EEE MMM dd HH:mm:ss zzz yyyy");
        for (int i = 0; i < 25; i++) {
            String tributeEntry = "Tribute" + Integer.toString(i + 1);
            if (!tributefile.isSet(tributeEntry + ".Name")) return;
            String name = tributefile.getString(tributeEntry + ".Name");
            int score = tributefile.getInt(tributeEntry + ".Score");
            boolean alive = tributefile.getBoolean(tributeEntry + ".Alive");
                Date deathdate = new Date();
                try {
                deathdate = format.parse(tributefile.getString(tributeEntry + ".Date"));
            } catch (ParseException e) {
                this.plugin.log("can't read the date:" + deathdate + " resetting date.");
                deathdate = new Date(1L);
            }
            Tribute player = new Tribute(name, score, alive, deathdate);
            this.Tributes.add(player);
        }
    }

I hope someone can help me with this cause it's freaking me out xD.
Thanks in advance.

btw, I've commented the line numbers the error refers too.

 

the null pointer exception is happening on line 110 of TributeList.java
Could you tell us what line that is? You seem to have removed a bit of the code with ...

EDIT:Sorry. Missed the comment.

I'd avoid statics. I would also avoid defining the variables outside of the "onEnable" method. I'mnot quite sure, but I think it might be because of that static variable being defined somewhere.

 

I've commented the line, it is:
Main class:

Code:

      final private static TributeList tributelist = new TributeList(plugin); //line 20

Custom class:

Code:

          load(); //line 21

Code:

        FileConfiguration tributefile = plugin.getTributeFile(); //line 110

Thank you for helping

 

Yeah. Avoid the statics. If I remember correctly statics are defined before anything else in the class. So the TributeList(plugin) will be defining itself before plugin is ever defined.
It will be creating TributeList(null) as it's tribute list (I think.) Try creating these as non-statics inside the onEnable method and that should fix it.

 

The variable plugin is not set to a value when you initialize the TributeList.

 

Thank you guys! It worked!

 

btw: If you don't want to create a plugin called TributeList you should remove 'extends JavaPlugin' from TributeList.java

 

Ahh, I see, thanks, removed it.