Question Null Exception on getCommand

[mackaroni]

getting this error:

java.lang.NullPointerException: Cannot invoke "org.bukkit.command.PluginCommand.setExecutor(org.bukkit.command.CommandExecutor)" because the return value of "me.mackaroni.testplugin.TestPlugin.getCommand(String)" is null

my onEnable:

public void onEnable() {
        // Plugin startup logic
        Bukkit.getConsoleSender().sendMessage("[TEST PLUGIN]This Plugin Works!");
        //Bukkit.getPluginManager().registerEvents(new JoinMessage(), this);

        this.getCommand("doctor").setExecutor(new Heal());
    }

my paper-plugin.yml:

name: TestPlugin
version: 1.0.1
main: me.mackaroni.testplugin.TestPlugin
api-version: '1.20'

commands:
  doctor:
    description: "Heals player to full"
    usage: "/heal"

my heal class:

package me.mackaroni.testplugin;

import net.kyori.adventure.text.Component;
import net.kyori.adventure.text.TextComponent;
import net.kyori.adventure.text.event.ClickEvent;
import net.kyori.adventure.text.event.HoverEvent;
import net.kyori.adventure.text.format.NamedTextColor;
import net.kyori.adventure.text.format.TextDecoration;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.jetbrains.annotations.NotNull;

public class Heal implements CommandExecutor {

    @Override
    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command cmd, @NotNull String label, String[] args) {
        // checks command alias == "doctor"
        if (label.equalsIgnoreCase("doctor")) {
            // check that player is sending command
            if (!(sender instanceof Player player)) {
                sender.sendMessage(Component.text("[HEAL]Only Players Can Use This Command"));
                return true;
            }
            // check that player has perms for doctor.use
            if (!player.hasPermission("doctor.use")) {
                player.sendMessage(
                        Component.text("[HEAL]Cannot Use This Command").color(NamedTextColor.RED)
                );
                return true;
            }
            // "/doctor" input
            if (args.length == 0) {
                TextComponent message = Component.text("[HEAL]Want To Be Healed?")
                        .color(NamedTextColor.GOLD)
                        .decoration(TextDecoration.BOLD, true);
                message.clickEvent(ClickEvent.runCommand("/doctor healme"));
                message.hoverEvent(HoverEvent.showText(
                        Component.text("Click To Be Healed")
                                .color(NamedTextColor.GREEN)
                                .decoration(TextDecoration.ITALIC, true))
                );
                player.sendMessage(message);
                return true;
            }
            // "/heal" helper call
            if (args[0].equalsIgnoreCase("healme")) {
                player.setHealth(20.0);
                player.sendMessage(Component.text("[HEAL]You've Been Healed")
                        .color(NamedTextColor.GREEN)
                );
                return true;
            }
            // error pickup/redirect
            player.sendMessage(Component.text("[HEAL]Usage: /doctor?")
                    .color(NamedTextColor.RED)
            );
            return true;
        }
        return false;
    }

}

 

[mackaroni]

deleted paper-plugin.yml and replaced it with plugin.yml with the same text, now there's no error text but the command wont register/execute

 

[Notro]

YAML file is sensitive for Indentation, make sure everything is indented correctly.
More than that I would suggest a recode for this command.

package me.notro.sumowarriors.commands;

import lombok.NonNull;
import net.kyori.adventure.text.Component;
import net.kyori.adventure.text.event.ClickEvent;
import net.kyori.adventure.text.format.NamedTextColor;
import net.kyori.adventure.text.serializer.legacy.LegacyComponentSerializer;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.jetbrains.annotations.NotNull;

public class HealCommand implements CommandExecutor {

    @Override
    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command cmd, @NotNull String label, String[] args) {
        if (!(sender instanceof Player player)) {
            sender.sendMessage(
                    Component.text("[HEAL] Only players can Use this command")
                            .color(NamedTextColor.RED)
            );
            return false;
        }

        if (!player.hasPermission("doctor.use")) {
            player.sendMessage(
                    Component.text("[HEAL] Cannot use this command")
                            .color(NamedTextColor.RED)
            );
            return false;
        }

        Component message = createClickableMessage(
                "&6&l[HEAL] Click to be Healed",
                "doctor healme"
        );

        if (args.length == 0) {
            player.sendMessage(message);
            return true;
        } else if (args.length == 1 && args[0].equalsIgnoreCase("healme")) {
            healPlayer(player);

            player.sendMessage(
                    Component.text("[HEAL] You've Been Healed")
                            .color(NamedTextColor.GREEN)
            );
            return true;
        }

        player.sendMessage(
                Component.text("[HEAL] Usage: /doctor")
                        .color(NamedTextColor.RED)
        );
        return false;
    }

    @NonNull
    private Component createClickableMessage(@NonNull String message, @NonNull String command) {
        Component text = deserializeText(message);

        return text.clickEvent(
                ClickEvent.clickEvent(
                        ClickEvent.Action.RUN_COMMAND,
                        "/" + command
                )
        );
    }

    @NonNull
    private Component deserializeText(@NonNull String text) {
        return LegacyComponentSerializer
                .legacy('&')
                .deserialize(text);
    }
}

private void healPlayer(@NonNull Player player) {
    if (player.getHealth() != 20.0D)
        player.setHealth(20.0D);
    else
        player.sendMessage(
                Component.text("You are already full health!")
                        .color(NamedTextColor.RED)
        );
}

Here is a valid YAML file:

name: TestPlugin
version: '${version}'
main: me.mackaroni.testplugin.TestPlugin
api-version: '1.20'
authors: [mackaroni]
description: #Your project description

#every path is 2 spaces difference from the other
commands:
  doctor:
    aliases: heal
    description: Heal a player

@Override
public void onEnable() {
    /*
    Registering the command so the command would work in-game
    */
    getCommand("doctor").setExecutor(new HealCommand());
}