KittyCannonPlugin.java

package io.github.Dinner1111.KittyCannon;

import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.Location;
import org.bukkit.command.*;
import org.bukkit.entity.EntityType;
import org.bukkit.entity.Ocelot;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.util.Vector;

public class KittyCannonPlugin extends JavaPlugin implements CommandExecutor {
    
    double pitch;
    double yaw;
    double x;
    double y;
    double z;
    float explosionPower;
    Player p;
    int task;
    Vector vec;
    Location loc;
    
    @Override
    public void onEnable() {
        getLogger().info("Kittens: ready to cannon!");
    }
    @Override
    public void onDisable() {
        getLogger().info("Too much kitty carnage?");
    }
    public boolean onCommand(CommandSender sender, Command cmd, String cmdLine, String[] args) {
        p = (Player) sender;
        explosionPower = 1.5f;
        if (cmd.getName().equalsIgnoreCase("kittycannon")) {
            if (sender.hasPermission("Cannon.Kitty")) {
                if (args.length == 0) {
                    if (sender instanceof Player) {
                        pitch = ((p.getLocation().getPitch() + 90) * Math.PI) / 180;
                        yaw  = ((p.getLocation().getYaw() + 90)  * Math.PI) / 180;
                        x = Math.sin(pitch) * Math.cos(yaw);
                        y = Math.sin(pitch) * Math.sin(yaw);
                        z = Math.cos(pitch);
                        vec = new Vector(x, z, y).multiply(2);
                        Ocelot e = (Ocelot) p.getWorld().spawnEntity(p.getLocation(), EntityType.OCELOT);
                        e.setVelocity(vec);
                        p.sendMessage(ChatColor.GRAY + "Another one bites the dust...");
                        task = Bukkit.getServer().getScheduler()
                                .scheduleSyncDelayedTask(this, new Runnable() {
                                public void run() {
                                        e.getWorld().createExplosion(e.getLocation(), explosionPower); // error
                                        e.setHealth(0); // error 
                                        Bukkit.getScheduler().cancelTask(task);
                                    }
                                }, 10); 
                    }
                } else {
                    return false;
                }
            }
        }
        return true;
    }
}