Okay, so, I have an "animal" that I want to be able to make attack different types of mobs. She goes after them, but doesn't do damage, though. I'm aware, however, of a line of coding missing in the following code, and that is the AttackDamage coding. Problem is, most mobs don't seem to have that coding anyway, and when I do add that coding, I get an error. Here's the coding without the Attack Damage coding line.

package craftygirls.entity;

import net.minecraft.entity.Entity;
import net.minecraft.entity.EntityAgeable;
import net.minecraft.entity.SharedMonsterAttributes;
import net.minecraft.entity.ai.EntityAIAttackOnCollide;
import net.minecraft.entity.ai.EntityAIAvoidEntity;
import net.minecraft.entity.ai.EntityAIFollowParent;
import net.minecraft.entity.ai.EntityAIHurtByTarget;
import net.minecraft.entity.ai.EntityAILookIdle;
import net.minecraft.entity.ai.EntityAIMate;
import net.minecraft.entity.ai.EntityAINearestAttackableTarget;
import net.minecraft.entity.ai.EntityAIPanic;
import net.minecraft.entity.ai.EntityAISwimming;
import net.minecraft.entity.ai.EntityAITempt;
import net.minecraft.entity.ai.EntityAIWander;
import net.minecraft.entity.ai.EntityAIWatchClosest;
import net.minecraft.entity.monster.EntityEnderman;
import net.minecraft.entity.monster.EntitySkeleton;
import net.minecraft.entity.monster.EntitySpider;
import net.minecraft.entity.monster.EntityZombie;
import net.minecraft.entity.passive.EntityAnimal;
import net.minecraft.entity.passive.EntityVillager;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.init.Items;
import net.minecraft.item.ItemSeeds;
import net.minecraft.item.ItemStack;
import net.minecraft.world.World;

public class EntityTomboy extends EntityAnimal
{
    public EntityTomboy(World par1World)
    {
        super(par1World);
        this.setSize(0.9F, 2F);
        this.getNavigator().setAvoidsWater(true);
        this.tasks.addTask(0, new EntityAISwimming(this));
        this.tasks.addTask(1, new EntityAIAttackOnCollide(this, EntityZombie.class, 1.0D, true));
        this.tasks.addTask(1, new EntityAIAttackOnCollide(this, EntitySkeleton.class, 1.0D, true));
        this.tasks.addTask(1, new EntityAIAttackOnCollide(this, EntityEnderman.class, 1.0D, true));
        this.tasks.addTask(1, new EntityAIAttackOnCollide(this, EntitySpider.class, 1.0D, true));
        this.tasks.addTask(2, new EntityAIPanic(this, 1.4D));
        this.tasks.addTask(2, new EntityAIMate(this, 1.0D));
        this.tasks.addTask(3, new EntityAITempt(this, 1.0D, Items.cookie, false));
        this.tasks.addTask(4, new EntityAIFollowParent(this, 1.1D));
        this.tasks.addTask(5, new EntityAIWander(this, 1.0D));
        this.tasks.addTask(6, new EntityAIWatchClosest(this, EntityPlayer.class, 6.0F));
        this.tasks.addTask(7, new EntityAILookIdle(this));
        this.targetTasks.addTask(1, new EntityAIHurtByTarget(this, true));
        this.targetTasks.addTask(2, new EntityAINearestAttackableTarget(this, EntityZombie.class, 0, true));
        this.targetTasks.addTask(2, new EntityAINearestAttackableTarget(this, EntitySkeleton.class, 0, true));
        this.targetTasks.addTask(2, new EntityAINearestAttackableTarget(this, EntityEnderman.class, 0, true));
        this.targetTasks.addTask(2, new EntityAINearestAttackableTarget(this, EntitySpider.class, 0, true));
    }

    public boolean isAIEnabled() {
    	return true;
    }
    
    protected void applyEntityAttributes()
    {
        super.applyEntityAttributes();
        this.getEntityAttribute(SharedMonsterAttributes.maxHealth).setBaseValue(10.0D);
        this.getEntityAttribute(SharedMonsterAttributes.movementSpeed).setBaseValue(0.3D);
    }

    protected void fall(float par1) {}
    
    @Override
    protected String getLivingSound()
    {
        return null;//this refers to:yourmod/sound/YourSound
    }

    @Override
    protected String getHurtSound()
    {
        return null;//this refers to:yourmod/sound/optionalFile/YourSound
    }

    @Override
    protected String getDeathSound()
    {
        return null;//etc.
    }

    @Override
    protected float getSoundVolume()
    {
        return 0.4F;
    }

@Override
public EntityAgeable createChild(EntityAgeable var1) {
	return new EntityTomboy(this.worldObj);
}

public boolean isBreedingItem(ItemStack par1ItemStack)
    {
        return par1ItemStack != null && par1ItemStack.getItem() == Items.cookie;
    }

public boolean attackEntityAsMob(Entity par1Entity)
    {
        boolean flag = super.attackEntityAsMob(par1Entity);

        if (flag)
        {
            int i = this.worldObj.difficultySetting.getDifficultyId();

            if (this.getHeldItem() == null && this.isBurning() && this.rand.nextFloat() < (float)i * 0.3F)
            {
                par1Entity.setFire(2 * i);
            }
        }

        return flag;
    }
}

 

The line of code I'm referring to is

this.getEntityAttribute(SharedMonsterAttributes.attackDamage).setBaseValue(3.0D);

 

When I add the coding, though, she unspawns everywhere and when I try to spawn here I get this error:

java.lang.reflect.InvocationTargetException
[19:08:15] [server thread/WARN]: Skipping Entity with id 4
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at net.minecraft.entity.EntityList.createEntityByID(EntityList.java:233)
at net.minecraft.item.ItemMonsterPlacer.spawnCreature(ItemMonsterPlacer.java:173)
at net.minecraft.item.ItemMonsterPlacer.onItemUse(ItemMonsterPlacer.java:79)
at net.minecraft.item.ItemStack.tryPlaceItemIntoWorld(ItemStack.java:150)
at net.minecraft.server.management.ItemInWorldManager.activateBlockOrUseItem(ItemInWorldManager.java:424)
at net.minecraft.network.NetHandlerPlayServer.processPlayerBlockPlacement(NetHandlerPlayServer.java:596)
at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.processPacket(C08PacketPlayerBlockPlacement.java:74)
at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.processPacket(C08PacketPlayerBlockPlacement.java:122)
at net.minecraft.network.NetworkManager.processReceivedPackets(NetworkManager.java:242)
at net.minecraft.network.NetworkSystem.networkTick(NetworkSystem.java:190)
at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:762)
at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:650)
at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:120)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:528)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:787)
Caused by: java.lang.NullPointerException
at craftygirls.entity.EntityTomboy.applyEntityAttributes(EntityTomboy.java:65)
at net.minecraft.entity.EntityLivingBase.<init>(EntityLivingBase.java:204)
at net.minecraft.entity.EntityLiving.<init>(EntityLiving.java:98)
at net.minecraft.entity.EntityCreature.<init>(EntityCreature.java:44)
at net.minecraft.entity.EntityAgeable.<init>(EntityAgeable.java:17)
at net.minecraft.entity.passive.EntityAnimal.<init>(EntityAnimal.java:34)
at craftygirls.entity.EntityTomboy.<init>(EntityTomboy.java:34)
... 19 more

I don't get it?

Did you check that EntityAnimal actually has the attributes:

this.getEntityAttribute(SharedMonsterAttributes.maxHealth).setBaseValue(10.0D);
        this.getEntityAttribute(SharedMonsterAttributes.movementSpeed).setBaseValue(0.3D);

that you are trying to set values on?

I'm guessing it doesn't and that is causing your NPE.

It does not seem to, however, it also doesn't seem to have the maxHealth attribute in its coding either, yet that's not causing me an issue. But, assuming that is the issue...how would I go about giving it an attack power? I figured copying that code would do it, but if not, then I'm at a loss as of how to do it, but I need her to have attack ability...

I suggest goind into the EntityCreature class as taking a look at that code. I copy and pasted thr attack code in, tested the tasks to get it working, then modified the variables to what i wanted. But thats what i had to do to get my mod working the way i wanted, for you there may be a simpler way, but thats the way i know.

I tried copying the attackDamage coding from the SharedMonsterAttributes into Tomboy's coding and then running the same line again (aimed at her coding for the attribute) and I'm still getting the same error. I don't understand why she's erroring when I give her attack power...