Solved NullPointerException

I've just split my plugin into different classes (before all the commands were all in one), and now I'm getting a NullPointerException.
All my class files (except the main one) have this at the start:

Code:

    private ClassName plugin;
    public ClassName(KnightzMCBasics knightzMCBasics) {
    }
    public void MyPluginCommandExecutor(ClassName plugin) {
        this.plugin = plugin;
    }

They don't actually say ClassName, it's for easier viewing.
My main class has this in the onEnable():

Code:

        this.getCommand("knightzmc").setExecutor(new KnightzMCLinks(this));
        this.getCommand("knightzmc").setExecutor(new KnightzMCBurn(this));
        this.getCommand("knightzmc").setExecutor(new KnightzMCProfits(this));
        this.getCommand("knightzmc").setExecutor(new KnightzMCHints(this));
        this.getCommand("knightzmc").setExecutor(new KnightzMCHeals(this));
        this.getCommand("knightzmc").setExecutor(new KnightzMCRandomTP(this));

and also vault implementation.
Before you ask, no I haven't extended JavaPlugin in all of the class files, however I'm really new to java and any help would be nice!
Thanks!

 

@TheMinecraftKnight

Don't. You can only have one class that extends Java plugin.

Please read this, and then tell us which line is throwing the NPE
https://bukkit.org/threads/how-to-r...ubleshoot-your-own-plugins-by-yourself.32457/

Then you're going to have a bad time. Without propper knowledge of Java by itself, you will run into problems like these very often. I have been on this forum for almost four years. Most of the problems here are caused from a lack of knowledge in Java. Please, pick a tutorial from the following list, learn Java, and then come back to bukkit. It should not take more than a month to finish them.
https://bukkit.org/threads/plugin-dev-sticky-learning-java-where-to-learn.395662/

 

Followed the stack trace post, there was something wrong with Vault's setupChat
I just commented it all and it's fixed now, not really sure why though - I got the code from Vault's github page
EDIT: The commands all work in the console, but not as a player...

 

1. Uncommented it
2. This is my CommandExecutor Class:
http://pastebin.com/mmymKs00
3. This is my main class:
http://pastebin.com/Di0ev5ck

 

By constructor do you mean the main class?

 

I've added that, however it comes up with an error: plugin cannot be resolved to a variable
http://pastebin.com/uXFyp0aC

 

Would just the default field that was created by Eclipse work? It doesn't seem to be right now, do I have to add something else to private Object plugin; ?

 

I know this is probably a noob question, I'm currently in the middle of learning java, but how would I do that?

 

Types are defined more or less by the class names (only if they're object-oriented). Your main class in the Bukkit plugin context would be whichever class has your onEnable() (there should only be one, else you're doing this all wrong). String is of type String, int is an int, Boolean is a Boolean, and if my main class is called DrkPlugin and has my onEnable(), my main class's type would be of DrkPlugin type.
@TheMinecraftKnight if you were only to make it an Object, well, a lot of things are objects. You want to make sure the program knows you mean this specific object with all the data associated with it (so not Object, but "DrkPlugin" in my example).

A quick google search yielded this, which will only help with the basic data types (int, char, long, short, byte, boolean, double, NOT stuff like String, JavaPlugin, Boolean (capitalization matters!))

 

Fixed by following this tutorial:
https://bukkit.org/threads/tutorial-using-multiple-classes.179833/
Thanks for the attempts at helping me, everyone!