AssertionError on world.getHandle().addEntity()

I've made a couple custom entities before, but this is my first time doing a Projectile, and I get this weird error

Code:

2013-07-25 21:41:00 [SEVERE] Could not pass event PlayerInteractEvent to Plugin v1.0
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
    at org.bukkit.craftbukkit.v1_6_R2.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:192)
    at org.bukkit.craftbukkit.v1_6_R2.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:162)
    at net.minecraft.server.v1_6_R2.PlayerConnection.a(PlayerConnection.java:610)
    at net.minecraft.server.v1_6_R2.Packet15Place.handle(SourceFile:58)
    at net.minecraft.server.v1_6_R2.NetworkManager.b(NetworkManager.java:296)
    at net.minecraft.server.v1_6_R2.PlayerConnection.e(PlayerConnection.java:118)
    at net.minecraft.server.v1_6_R2.ServerConnection.b(SourceFile:37)
    at net.minecraft.server.v1_6_R2.DedicatedServerConnection.b(SourceFile:30)
    at net.minecraft.server.v1_6_R2.MinecraftServer.t(MinecraftServer.java:590)
    at net.minecraft.server.v1_6_R2.DedicatedServer.t(DedicatedServer.java:226)
    at net.minecraft.server.v1_6_R2.MinecraftServer.s(MinecraftServer.java:486)
    at net.minecraft.server.v1_6_R2.MinecraftServer.run(MinecraftServer.java:419)
    at net.minecraft.server.v1_6_R2.ThreadServerApplication.run(SourceFile:582)
Caused by: java.lang.AssertionError: class me.pkt77.plugin.entities.CustomSnowball
    at org.bukkit.craftbukkit.v1_6_R2.entity.CraftEntity.getEntity(CraftEntity.java:155)
    at net.minecraft.server.v1_6_R2.Entity.getBukkitEntity(Entity.java:1385)
    at net.minecraft.server.v1_6_R2.World.addEntity(World.java:926)
    at me.pkt77.minez.PlayerData.go(PlayerData.java:309)
    at me.pkt77.minez.PlayerData.interact(PlayerData.java:266)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
    ... 16 more

my code:

Code:

        Location loc = player.getEyeLocation();
        Vector velocity = loc.getDirection();
        CraftWorld world = (CraftWorld) loc.getWorld();
        CustomSnowball snow = new CustomSnowball(world.getHandle());
        snow.setPositionRotation(loc.getX(), loc.getY(), loc.getZ(), loc.getPitch(), loc.getYaw());
        snow.shoot(velocity.getX(), velocity.getY(), velocity.getZ(), speed, spread);
        world.getHandle().addEntity(snow, SpawnReason.NATURAL); //error here

Thats the same code I use for all my custom entities (except the shoot method for this projectile), so I don't see why this error is happening...

CustomSnowball class:

Code:

public class CustomSnowball extends EntityProjectile {
 
    public CustomSnowball(World world) {
        super(world);
    }
 
    protected void a(MovingObjectPosition arg0) {
        for (int i = 0; i < 8; i++)
            this.world.addParticle("snowballpoof", this.locX, this.locY, this.locZ, 0.0D, 0.0D, 0.0D);
        if (!this.world.isStatic)
            die();
    }
 
    public void shoot(double d0, double d1, double d2, float f, float f1) {
        float f2 = MathHelper.sqrt(d0 * d0 + d1 * d1 + d2 * d2);
        d0 /= f2;
        d1 /= f2;
        d2 /= f2;
        d0 += random.nextGaussian() * (random.nextBoolean() ? -1 : 1) * 0.007499999832361937D * f1;
        d1 += random.nextGaussian() * (random.nextBoolean() ? -1 : 1) * 0.007499999832361937D * f1;
        d2 += random.nextGaussian() * (random.nextBoolean() ? -1 : 1) * 0.007499999832361937D * f1;
        d0 *= f;
        d1 *= f;
        d2 *= f;
        motX = d0;
        motY = d1;
        motZ = d2;
        float f3 = MathHelper.sqrt(d0 * d0 + d2 * d2);
        lastYaw = (yaw = (float) (Math.atan2(d0, d2) * 180.0D / 3.141592741012573D));
        lastPitch = (pitch = (float) (Math.atan2(d1, f3) * 180.0D / 3.141592741012573D));
    }
}

 

pkt What's in your CustomSnowball class? It could be because your CustomSnowball class doesn't somehow extend a net.minecraft.server entity

 

pkt
That is way more complex than it needs to be if you just want to control a snowball

 

what would you suggest then? I had to learn how to make custom entities myself, as the tutorials didn't work for me...

added it above ^

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

 

pkt
Javadocs. http://jd.bukkit.org/dev/apidocs/
Also make sure to show Polaris29 your CustomSnowball class
Otherwise

PHP:

Snowball sb = (Snowball) player.getWorld().spawn(player.getEyeLocation(), Snowball.class);
sb.setVelocity(player.getLocation().getDirection());

That would shoot a snowball the direction the player is facing. To make it go faster add .multiply(int) after getDirection()

 

pkt
It can't extend EntityProjectile
https://github.com/Bukkit/CraftBukk...kkit/craftbukkit/entity/CraftEntity.java#L118
You see that if the entity is an instanceof EntityProjectile, it checks if its an EntityEgg, EntitySnowball, EntityPotion, EntityEnderPearl or EntityThrownExpBottle

But it doesn't do anything if it's extends just EntityProjectile, and moves on below to thrown an AssertionError

 

Actually, velocity.multiply() is why I ended up making the custom snowball :/ , as it seems to make the projectile curve really fast about 3 seconds after its thrown... any suggestions?

 

pkt
You can create your own vector. Or take what Polaris29 said, always be open for ideas/fixes