Error occurred when enabling yoCores v1.0-SNAPSHOT (Is it up to date?)

Hey, so I'm a little new to java developing, and I'm making my core plugin right now. My event handlers are fine, and everything worked fine until I tried to add some commands, in which these errors in my console popped up:

Code:

[18:12:48 ERROR]: Error occurred while enabling yoCores v1.0-SNAPSHOT (Is it up to date?)
java.lang.NullPointerException
        at me.yochran.yocores.yoCores.onEnable(yoCores.java:16) ~[?:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321) ~[spigot.jar:git-Spigot-21fe707-e1ebe52]
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:340) [spigot.jar:git-Spigot-21fe707-e1ebe52]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) [spigot.jar:git-Spigot-21fe707-e1ebe52]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugin(CraftServer.java:357) [spigot.jar:git-Spigot-21fe707-e1ebe52]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.enablePlugins(CraftServer.java:317) [spigot.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.MinecraftServer.s(MinecraftServer.java:414) [spigot.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.MinecraftServer.k(MinecraftServer.java:378) [spigot.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.MinecraftServer.a(MinecraftServer.java:333) [spigot.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:263) [spigot.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:525) [spigot.jar:git-Spigot-21fe707-e1ebe52]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_221]

I'm not sure at all what the problem is, my plugin.yml is fine i'm sure. Here is all of my project files just in case:

Code:

package me.yochran.yocores;

import me.yochran.yocores.commands.HealFeed;
import me.yochran.yocores.events.JoinLeaveEvent;
import org.bukkit.ChatColor;
import org.bukkit.plugin.java.JavaPlugin;

public class yoCores extends JavaPlugin {

    @Override
    public void onEnable() {
        // Plugin startup logic
        HealFeed healfeedcommand = new HealFeed();
        System.out.println(ChatColor.GREEN + "[yoCores]: yoCores v1.0-SNAPSHOT has successfully loaded.");
        getServer().getPluginManager().registerEvents(new JoinLeaveEvent(), this);
        getCommand("heal").setExecutor(healfeedcommand);
        getCommand("feed").setExecutor(healfeedcommand);

    }

    @Override
    public void onDisable() {
        // Plugin shutdown logic
        System.out.println(ChatColor.RED + "[yoCores]: yoCores v1.0-SNAPSHOT has successfully unloaded.");
    }
}

this is the commands class

Code:

package me.yochran.yocores.commands;

import org.bukkit.ChatColor;
import org.bukkit.attribute.Attribute;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;

public class HealFeed implements CommandExecutor {

    @Override
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
        if (!(sender instanceof Player)) { return true; }
        Player player = (Player) sender;

        if (cmd.getName().equalsIgnoreCase("heal")) {
            double maxHealth = player.getAttribute(Attribute.GENERIC_MAX_HEALTH).getDefaultValue();
            player.setHealth(maxHealth);
            player.setFoodLevel(20);
            return true;
        }

        if (cmd.getName().equalsIgnoreCase("feed")) {
            player.setFoodLevel(20);
            return true;
        }

        return true;
    }
}

this is my plugin.yml:

Code:

name: yoCores
version: 1.0
author: Yochran
main: me.yochran.yocores.yoCores
api-version: 1.8.8
commands:
  heal:
    description: Heals the player.
    usage: /<command>
    permission: yocores.heal
  feed:
      description: Feeds the player.
      usage: /<command>
      permission: yocores.feed

could anyone help me resolve this issue? I'm using Spigot API, running 1.8.8 spigot.

 

In your main class line 16 returns null

Ok so if i am able to count than this is your line 16

Code:

getCommand("heal").setExecutor(healfeedcommand);

EDIT: Also there is no api-version: 1.8.8 only from 1.13

 

There's no errors in my code I don't really see what I did wrong, am I supposed to put return true; at the end of it?

 

I think you might've compiled the plugin with the wrong jar because there is no player.getAttribute() in 1.8.8

You can check here:
https://helpch.at/docs/1.8.8/org/bukkit/entity/Player.html

 

Ok, I removed that and just did player.setHealth(20);

How can i fix the error where it returns null?

 

If you did that and removed the api-version: 1.8.8 from your plugin.yml than it should work now

 

Done that, same error. This is my new plugin.yml:

Code:

name: yoCores
version: 1.0
description: yoCores Plugin made by me
author: Yochran
main: me.yochran.yocores.yoCores
commands:
  Heal:
    description: Heals the player.
    usage: /<command>
    permission: yocores.heal
  Feed:
    description: Feeds the player.
    usage: /<command>
    permission: yocores.feed

 

Your command names in the yaml file is capitalized whereas the ones that get retrieved in the plugin are not?

( So like you put "Heal" in the yml file but you tried to get the command "heal"? )

 

Yes but in the first post it was low case but still try to put "heal" instead of "Heal" same for feed