Arraylists being deleted after server reload!

Hey guys
I have this major problem, I'm coding this plugin where when you use a command you get added to an arraylist, the plugin then recognizes that their name is in the arraylists and so they won't be able to successfully use the command again. Here's some of the code

Code:

public class Main extends JavaPlugin {
    ArrayList<String> PremiumReclaim = new ArrayList<String>();
    ArrayList<String> kitused = new ArrayList<String>();
    ArrayList<String> SupporterReclaim = new ArrayList<String>();
    ArrayList<String> VIPReclaim = new ArrayList<String>();

Code:

public class PremiumReclaim implements CommandExecutor {
    public Main plugin;
    public PremiumReclaim(Main instance){
        plugin = instance;
    }
    public boolean onCommand(CommandSender sender, Command cmd, String commandLabel, String [] args) {
        Player p = (Player) sender;
        if (commandLabel.equalsIgnoreCase("PremiumReclaim")){
            if(p.hasPermission("premiumreclaim.use")){
            if(!plugin.PremiumReclaim.contains(p.getName())){
                if(!plugin.kitused.contains(p.getName())){ 
                    plugin.PremiumReclaim.add(p.getName());
                    plugin.kitused.add(p.getName());

The problem is when the server has a reload, all the arrays are wiped from the arraylist. This means when they perform the command again they will be able to due to their names not being on the list. Is there a way to permanently keep their names on an arraylist, or some way to constantly add them to the list somehow after a reload? Thanks!

 

aliano99 Arrays wiped from arraylist? wat

Anyway, you can simply store the lists in (example) YAML files, which is also the easiest way, by doing:

PHP:

getConfig().set("List1", YourArrayList);
getConfig().save();
 
// Loading it
List<String> list = getConfig().getStringList("List1");

 

Oh that's not a bad solution. I can use that for now, but is there any other way to do this except by it generating files?

 

aliano99

If you want the ArrayList to persist between reloads you'll have to serialise it to a file onDisable and serialise it onEnable,

Also I'd suggest you to use a HashMap for kits, you do not need more than one and you can even check what kit a player has.

 

When a plugin or the server is reloaded you lose all of your saved variables from before.
Inside of your onDisable method you need to devise a method of saving all of your information to disk and then check to see if there is any information in your onEnable and load it back up.

To expand on the above, you'd do something like this:

Code:java

 
@Override
public void onEnable() {
    getConfig().load("list.yaml");
    list = getConfig().getList("YourListName");
}
 
@Override
public void onDisable() {
    getConfig().set(<Your list name here!>, <Your array list variable>);
    getConfig().save(list.yaml);
}
 

 

Hey
Sorry I've just started coding Java, and this is the first file I've ever generated using Java and I'm already struggling xD
Where in my code should I place this

Code:

getConfig().set("List1", YourArrayList);
getConfig().save();

Do I place it in my main class? If so, here's my full main class. Can you tell me how I incorporate this into here?

Code:

package com.aliano99.Tut;
 
 
import java.util.ArrayList;
 
import org.bukkit.plugin.java.JavaPlugin;
 
public class Main extends JavaPlugin {
    ArrayList<String> PremiumReclaim = new ArrayList<String>();
    ArrayList<String> kitused = new ArrayList<String>();
    ArrayList<String> SupporterReclaim = new ArrayList<String>();
    ArrayList<String> VIPReclaim = new ArrayList<String>();
 
    public void onEnable() {
        commands();
    }
    public void commands(){
    getCommand ("PremiumReclaim").setExecutor(new PremiumReclaim(this));   
    getCommand ("SupporterReclaim").setExecutor(new SupporterReclaim(this));
    getCommand ("VIPReclaim").setExecutor(new VIPReclaim(this));
    }
   
 
}
   
 

Bump

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

aliano99 If this is your first experience with Java, then you are doing it wrong. It is often suggested to get some experience with Java first before you start with Bukkit. That aside, the Bukkit API has specific methods in JavaPlugin that you should override and use for this case, which can be found in the documentation