Exploding snowballs

Hello
I am quite new to plugin development, I'm currently coding a grenade plugin for my server but I get some errors in the console (tell me if you need me to post the error). I have tried adding some else statements but didn't help (maybe did something wrong).
Can you see if you find any errors in this code:

Code:java

package me.sladdcool.maestro;
 
import java.util.ArrayList;
import java.util.Arrays;
 
import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.World;
import org.bukkit.entity.HumanEntity;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.entity.ProjectileHitEvent;
import org.bukkit.plugin.java.JavaPlugin;
 
public class XplodeArrows extends JavaPlugin implements Listener {
    private static ArrayList<String> allowed = new ArrayList<String>(Arrays.asList("CraftEgg", "CraftArrow", "CraftSnowball"));
 
    @Override
    public void onEnable() {
        Bukkit.getServer().getPluginManager().registerEvents(this, this);
    }
 
    @EventHandler
    public void onHit(ProjectileHitEvent e) {
        if(allowed.contains(e.getEntity().getClass().getSimpleName()) && e.getEntity().getShooter() instanceof Player) {
            if(((Player) e.getEntity().getShooter()).hasPermission("projectile.xplode")) {
                if(((Player) e.getEntity().getShooter()).getItemInHand().getType() == Material.SNOW_BALL) {
                    if(((Player) e.getEntity().getShooter()).getItemInHand().getItemMeta().getDisplayName().contains("Grenade")) {
                        World world = e.getEntity().getWorld();
                        Location loc = e.getEntity().getLocation();
 
                        int x = loc.getBlockX();
                        int y = loc.getBlockY();
                        int z = loc.getBlockZ();
 
                        world.createExplosion(x, y, z, 2f, true, true);
                    }
                }
            }
        }
    }
}

 

What's the errors? And does it work?

 

Yes the plugin works and here's what errors the console gives (only when i throw normal snowballs):

Code:

[18:00:05 ERROR]: Could not pass event ProjectileHitEvent to XplodeArrows v1.0
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:320) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:486) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:471) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at org.bukkit.craftbukkit.v1_7_R1.event.CraftEventFactory.callProjectile
HitEvent(CraftEventFactory.java:609) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b302
0jnks]
        at net.minecraft.server.v1_7_R1.EntityProjectile.h(EntityProjectile.java
:158) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at net.minecraft.server.v1_7_R1.World.entityJoinedWorld(World.java:1348)
[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at net.minecraft.server.v1_7_R1.World.playerJoinedWorld(World.java:1329)
[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at net.minecraft.server.v1_7_R1.World.tickEntities(World.java:1217) [cra
ftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at net.minecraft.server.v1_7_R1.WorldServer.tickEntities(WorldServer.jav
a:480) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:6
37) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:2
50) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:5
45) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java
:457) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:6
17) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
Caused by: java.lang.NullPointerException
        at me.sladdcool.maestro.XplodeArrows.onHit(XplodeArrows.java:31) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0
_51]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0
_51]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1
.7.0_51]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_51]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:318) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
        ... 14 more
>

driver-e

When I have your attention Do you know what I should be using instead of getShooter nowadays?
Eclipse says it's deprecated.

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

 

Sladd_Cool if I am not mistaken, getShooter is the only way to do that, there is no alternative. Just suppress deprecation warnings.

 

Ok thanks PluginStudios

 

Sladd_Cool Is your problem solved? If it is not, try using:

Code:java

try {
 
// code
 
}catch (NullPointerException ex) {
// not needed to put anything here
} 

 

Do some checks to make sure stuff isn't null. The error you have is a null pointer exception.

 

Sorry for being so nooby Connor2weirdness but how do i check if stuff is null?

 

Sladd_Cool
if(thingtocheck == null)

 

So... I tried doing this

Code:

if(e.getEntity() == null);
    System.out.println(ChatColor.DARK_RED + "ERROR");

Changing e.getEntity to other stuff (I don't know if I did right), and when i throw a snowball named Grenade it displays the ERROR message I made and I didn't find any solution, the problem is still that if I throw Grenades it works fine and if I throw snowballs the error occurs

Forgot to tag you so I do it here (easier than editing the post).
Connor2weirdness
@NOOBHUN73R

@N00BHUN73R
Hmm I can't tag you...

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

 

N00BHUN73R misunderstood what you needed. He gave you the code to check is a value IS null. You need to use this instead which checks if stuff isn't null, because the exclamation mark means 'not':
if(value != null){