Solved IllegalArgumentException: File cannot be null. Why?

Hi, I'm making a multiworld spawn plugin for my server, and I get IllegalArgumentException whenever I try to set a spawn. Here's the necessary part of my code:

Code:java

    public static YamlConfiguration yml;
    public void onEnable(){
        yml = new YamlConfiguration();
        File config = new File("plugins/VinoSpawn/config.yml");
        try {
            yml.load(config);
        } catch (IOException | InvalidConfigurationException e) {
            e.printStackTrace();
        }
        loadConfiguration();
        this.getCommand("spawn").setExecutor(new AddSpawn(this));
        getLogger().info("Betoltve");
    }
    public void onDisable(){
        saveConfig();
    }
    public void loadConfiguration(){
        getConfig().addDefault("worlds","");
        getConfig().options().copyDefaults(true);
        saveConfig();
    }
    public void addSpawnToFile(World w, double x, double y, double z){
        String path = "worlds."+w.getName();
        getConfig().addDefault(path,"");  //error thrown here
        List<Double> d = new ArrayList<Double>();
        d.add(x);
        d.add(y);
        d.add(z);
        getConfig().set(path, d);
        System.out.println(w.getName() + " spawn elkeszitve!");
    }

and the calling from the commandexecutor:

Code:java

                    Player p = (Player) sender;
                    VinoSpawn v = new VinoSpawn();
                    v.addSpawnToFile(p.getWorld(), p.getLocation().getX(), p.getLocation().getY(), p.getLocation().getZ());  //error thrown at this line too
 
                    return true;

What can be the problem? I have multiple worlds, that's why I want to programatically generate the config file when adding a spawn to a world which didn't had one yet. I'm thinking of making a for loop which goes through the List<World> of Bukkit.getWorlds() and then put getConfig().addDefault to the loop. Could that work? Or what's causing my error?

 

thefrooh Seems like your file is null, what line is the stack-trace pointing towards?

 

thefrooh don't create new instances of your main class.

 

fireblast709 you mean the VinoSpawn v = new VinoSpawn() part?

Skionz Stack trace:

Code:

org.bukkit.command.CommandException: Unhandled exception executing command 'spawn' in plugin VinoSpawn v0.1
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:196) ~[craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    at org.bukkit.craftbukkit.v1_7_R1.CraftServer.dispatchCommand(CraftServer.java:542) ~[craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    at net.minecraft.server.v1_7_R1.PlayerConnection.handleCommand(PlayerConnection.java:932) [craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    at net.minecraft.server.v1_7_R1.PlayerConnection.a(PlayerConnection.java:814) [craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    at net.minecraft.server.v1_7_R1.PacketPlayInChat.a(PacketPlayInChat.java:28) [craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    at net.minecraft.server.v1_7_R1.PacketPlayInChat.handle(PacketPlayInChat.java:47) [craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    at net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:146) [craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    at net.minecraft.server.v1_7_R1.ServerConnection.c(SourceFile:134) [craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:655) [craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:250) [craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:545) [craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:457) [craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617) [craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
Caused by: java.lang.IllegalArgumentException: File cannot be null
    at org.apache.commons.lang.Validate.notNull(Validate.java:203) ~[craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    at org.bukkit.configuration.file.YamlConfiguration.loadConfiguration(YamlConfiguration.java:171) ~[craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    at org.bukkit.plugin.java.JavaPlugin.reloadConfig(JavaPlugin.java:118) ~[craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    at org.bukkit.plugin.java.JavaPlugin.getConfig(JavaPlugin.java:112) ~[craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
    at com.ezres.vinospawn.VinoSpawn.addSpawnToFile(VinoSpawn.java:41) ~[?:?]
    at com.ezres.vinospawn.AddSpawn.onCommand(AddSpawn.java:31) ~[?:?]
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]

 

thefrooh yes

 

Which line is the exception on? We can't find it because we don't have both of your classes.

 

In my first post, I've added comments to the lines which throws exception, there are 2 of it, one is in my main class, where I add a new default value to the world in which the player set a spawn:

Code:java

getConfig().addDefault(path,"");

and then when I call it from the other class:

Code:java

v.addSpawnToFile(p.getWorld(), p.getLocation().getX(), p.getLocation().getY(), p.getLocation().getZ());

 

Solved with a different method (created files for each world using BufferedWriter and Reader).