Solved NullPointerException for putting data in messages.yml

Code:java

 
    private MessageFormat msgFormat;
    public static HashMap<String, String> messageData = new HashMap<String, String>();
 
    @Override
    public void onEnable() {
        File f = new File(getDataFolder()+File.separator+"messages.yml");
 
        if (!f.exists()) {
            try {
                getDataFolder().mkdir();
                f.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
 
        msgFormat.setMessage("playerOnly", "&4Only a player can use this command.");
        msgFormat.setMessage("playerOffline", "&4That player is offline.");
        msgFormat.setMessage("noPermissionSelf", "&4You do not have permission to execute this command.");
        msgFormat.setMessage("noPermissionOthers", "&4You do not have permission to execute this command.");
        msgFormat.setMessage("nvEnabled", "&bNightVision has been &aEnabled.");
        msgFormat.setMessage("nvDisabled", "&bNightVision has been &4Disabled.");
        msgFormat.setMessage("nvEnabledBy", "&bYour NightVision was &aEnabled &bby {player}.");
        msgFormat.setMessage("nvDisabledBy", "&bYour NightVision was &4disabled &bby {player}.");
        msgFormat.setMessage("nvTargetEnabled", "&bYou &aEnabled &b{target}'s NightVision.");
        msgFormat.setMessage("nvTargetDisabled", "&bYou &4Disabled &b{target}'s NightVision.");
 
        FileConfiguration config = YamlConfiguration.loadConfiguration(f);
        for (String message : config.getConfigurationSection("").getKeys(false)) {
            messageData.put(message, config.getString(message));
        }
    }
 

I get a NullPointerException Error here at:

Code:

        msgFormat.setMessage("playerOnly", "&4Only a player can use this command.");

Code:java

 
    private FileConfiguration msgConfig;
 
    public void setMessage(String name, String message) {
        File f = new File(getDataFolder()+File.separator+"messages.yml");
        msgConfig = YamlConfiguration.loadConfiguration(f);
        if (!msgConfig.isSet(name)) {
            msgConfig.set(name, message);
            try {
                msgConfig.save(f);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
 

I noticed that this works if I place the setMessage() function in the Main class with the onEnable(). I wanted to keep my setters and getters separate, so I made another class for it. Though, this NullPointerException error is throwing me off.

 

Thank you very much! Found out through a couple of tests and errors that you can't have two Initialization features of JavaPlugin. So I ended up sending the Main class through the function in order to gain access to the JavaPlugin without re-initializing it.

For those that don't understand my solution from timtower's help here it is:

Code:java

 
public class Main extends JavaPlugin {
 
    private Plugin plugin;
    MessageFormat msgFormat = new MessageFormat();
    public static HashMap<String, String> messageData = new HashMap<String, String>();
 
    @Override
    public void onEnable() {
        plugin = this;
        File f = new File(getDataFolder()+File.separator+"messages.yml");
 
        if (!f.exists()) {
            try {
                getDataFolder().mkdir();
                f.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        msgFormat.setMessage(plugin ,"playerOnly", "&4Only a player can use this command.");
        msgFormat.setMessage(plugin, "playerOffline", "&4That player is offline.");
        msgFormat.setMessage(plugin, "noPermissionSelf", "&4You do not have permission to execute this command.");
        msgFormat.setMessage(plugin, "noPermissionOthers", "&4You do not have permission to execute this command.");
        msgFormat.setMessage(plugin, "nvEnabled", "&bNightVision has been &aEnabled.");
        msgFormat.setMessage(plugin, "nvDisabled", "&bNightVision has been &4Disabled.");
        msgFormat.setMessage(plugin, "nvEnabledBy", "&bYour NightVision was &aEnabled &bby {player}.");
        msgFormat.setMessage(plugin, "nvDisabledBy", "&bYour NightVision was &4disabled &bby {player}.");
        msgFormat.setMessage(plugin, "nvTargetEnabled", "&bYou &aEnabled &b{target}'s NightVision.");
        msgFormat.setMessage(plugin, "nvTargetDisabled", "&bYou &4Disabled &b{target}'s NightVision.");
        FileConfiguration config = YamlConfiguration.loadConfiguration(f);
        for (String message : config.getConfigurationSection("").getKeys(false)) {
            messageData.put(message, config.getString(message));
        }
 

Code:java

 
public class MessageFormat {
    private FileConfiguration msgConfig;
 
    public void setMessage(Plugin plugin, String name, String message) {
        File f = new File(plugin.getDataFolder()+File.separator+"messages.yml");
        msgConfig = YamlConfiguration.loadConfiguration(f);
        if (!msgConfig.isSet(name)) {
            msgConfig.set(name, message);
            try {
                msgConfig.save(f);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }