[1.10.2] Spawning mob in caves only

[Egietje]

Hello, I want to make a mob that only spawns in caves (can't see sky using this.worldObj.canBlockSeeSky) and make it so it only spawns < 64 y to prevent it from spawning under trees but how would I make it spawn only under 64 y levels?

[Egietje]

I know, but how can I make it so they only spawn under 64 y levels?

[Egietje]

Will return super.getCanSpawnHere() && this.worldObj.canBlockSeeSky(this.getPosition()) && this.getPosition().getY() < 64; work?

[Choonster]

Will return super.getCanSpawnHere() && this.worldObj.canBlockSeeSky(this.getPosition()) && this.getPosition().getY() < 64; work?

 

That will allow the entity to spawn if the block it's in can see the sky and the y coordinate is less than 64. You want it to spawn when the block can't see the sky, so negate the return value of

World#canBlockSeeSky

.

[Egietje]

Thanks, but they also spawned higher than 64..?

[Choonster]

Thanks, but they also spawned higher than 64..?

 

Post your new code. I suspect you've negated the y-level check as well as the sky check.

[Egietje]

I also lowered the y level to 55, here is the full class:

package com.Egietje.KokkieMod.mobs.grot;

import java.util.UUID;

import javax.annotation.Nullable;

import com.Egietje.KokkieMod.init.KokkieSounds;
import com.Egietje.KokkieMod.mobs.KokkieLoot;
import com.google.common.base.Predicate;

import net.minecraft.block.Block;
import net.minecraft.entity.Entity;
import net.minecraft.entity.EntityAgeable;
import net.minecraft.entity.EntityLiving;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.SharedMonsterAttributes;
import net.minecraft.entity.ai.EntityAIAttackMelee;
import net.minecraft.entity.ai.EntityAIBeg;
import net.minecraft.entity.ai.EntityAIFollowOwner;
import net.minecraft.entity.ai.EntityAIFollowParent;
import net.minecraft.entity.ai.EntityAIHurtByTarget;
import net.minecraft.entity.ai.EntityAILeapAtTarget;
import net.minecraft.entity.ai.EntityAILookIdle;
import net.minecraft.entity.ai.EntityAIMate;
import net.minecraft.entity.ai.EntityAINearestAttackableTarget;
import net.minecraft.entity.ai.EntityAIOwnerHurtByTarget;
import net.minecraft.entity.ai.EntityAIOwnerHurtTarget;
import net.minecraft.entity.ai.EntityAIPanic;
import net.minecraft.entity.ai.EntityAISit;
import net.minecraft.entity.ai.EntityAISwimming;
import net.minecraft.entity.ai.EntityAITargetNonTamed;
import net.minecraft.entity.ai.EntityAITempt;
import net.minecraft.entity.ai.EntityAIWander;
import net.minecraft.entity.ai.EntityAIWatchClosest;
import net.minecraft.entity.monster.EntityCreeper;
import net.minecraft.entity.monster.EntityGhast;
import net.minecraft.entity.monster.EntityMob;
import net.minecraft.entity.monster.EntitySkeleton;
import net.minecraft.entity.passive.EntityAnimal;
import net.minecraft.entity.passive.EntityChicken;
import net.minecraft.entity.passive.EntityHorse;
import net.minecraft.entity.passive.EntityRabbit;
import net.minecraft.entity.passive.EntitySheep;
import net.minecraft.entity.passive.EntityTameable;
import net.minecraft.entity.passive.EntityWolf;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.entity.projectile.EntityArrow;
import net.minecraft.init.Items;
import net.minecraft.init.SoundEvents;
import net.minecraft.item.EnumDyeColor;
import net.minecraft.item.ItemFood;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.network.datasync.DataParameter;
import net.minecraft.network.datasync.DataSerializers;
import net.minecraft.network.datasync.EntityDataManager;
import net.minecraft.util.DamageSource;
import net.minecraft.util.EnumHand;
import net.minecraft.util.EnumParticleTypes;
import net.minecraft.util.ResourceLocation;
import net.minecraft.util.SoundEvent;
import net.minecraft.util.datafix.DataFixer;
import net.minecraft.util.math.BlockPos;
import net.minecraft.util.math.MathHelper;
import net.minecraft.world.EnumDifficulty;
import net.minecraft.world.EnumSkyBlock;
import net.minecraft.world.World;
import net.minecraft.world.storage.loot.LootTableList;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;

public class EntityGrotKokkie extends EntityTameable {
private static final DataParameter<Float> DATA_HEALTH_ID = EntityDataManager
		.<Float>createKey(EntityGrotKokkie.class, DataSerializers.FLOAT);
private float headRotationCourse;
private float headRotationCourseOld;

public EntityGrotKokkie(World worldIn) {
	super(worldIn);
	this.setSize(0.4F, 0.6F);
	this.setTamed(false);
}

protected void initEntityAI() {
	this.tasks.addTask(1, new EntityAISwimming(this));
	this.tasks.addTask(2, new EntityAIAttackMelee(this, 1.0D, true));
	this.tasks.addTask(3, new EntityAIMate(this, 1.0D));
	this.tasks.addTask(4, new EntityAIWander(this, 1.0D));
	this.tasks.addTask(5, new EntityAIWatchClosest(this, EntityPlayer.class, 8.0F));
	this.tasks.addTask(6, new EntityAILookIdle(this));
	this.tasks.addTask(7, new EntityAILeapAtTarget(this, 0.4F));
	this.tasks.addTask(8, new EntityAIFollowParent(this, 1.1D));
	this.tasks.addTask(9, new EntityAITempt(this, 0.9D, Items.CHICKEN, false));
	this.targetTasks.addTask(1, new EntityAIHurtByTarget(this, true, new Class[0]));
	this.targetTasks.addTask(2,
			new EntityAITargetNonTamed(this, EntityAnimal.class, false, new Predicate<Entity>() {
				public boolean apply(@Nullable Entity p_apply_1_) {
					return p_apply_1_ instanceof EntitySheep || p_apply_1_ instanceof EntityRabbit
							|| p_apply_1_ instanceof EntityChicken;
				}
			}));
}

@Override
protected ResourceLocation getLootTable() {
	return KokkieLoot.ENTITIES_GROT;
}

@Override
public boolean isBreedingItem(@Nullable ItemStack stack) {
	return stack == null ? false : stack.getItem() == Items.CHICKEN;
}

protected void applyEntityAttributes() {
	super.applyEntityAttributes();
	this.getEntityAttribute(SharedMonsterAttributes.MOVEMENT_SPEED).setBaseValue(0.30000001192092896D);
	this.getEntityAttribute(SharedMonsterAttributes.MAX_HEALTH).setBaseValue(2.0D);
	this.getAttributeMap().registerAttribute(SharedMonsterAttributes.ATTACK_DAMAGE).setBaseValue(0.5D);
}

protected void updateAITasks() {
	this.dataManager.set(DATA_HEALTH_ID, Float.valueOf(this.getHealth()));
}

protected void entityInit() {
	super.entityInit();
	this.dataManager.register(DATA_HEALTH_ID, Float.valueOf(this.getHealth()));
}

protected void playStepSound(BlockPos pos, Block blockIn) {
	this.playSound(SoundEvents.ENTITY_ITEMFRAME_REMOVE_ITEM, 0.15F, 1.0F);
}

public static void func_189788_b(DataFixer p_189788_0_) {
	EntityLiving.func_189752_a(p_189788_0_, "GrotKokkie");
}

protected SoundEvent getAmbientSound() {
	return this.isAngry() ? KokkieSounds.GROT_KOKKIE_ANGRY
			: (this.rand.nextInt(2) == 0 ? KokkieSounds.GROT_KOKKIE_AMBIENCE : KokkieSounds.GROT_KOKKIE_AMBIENCE);
}

protected SoundEvent getHurtSound() {
	return KokkieSounds.GROT_KOKKIE_HURT;
}

protected SoundEvent getDeathSound() {
	return KokkieSounds.GROT_KOKKIE_DEATH;
}

/**
 * Returns the volume for the sounds this mob makes.
 */
protected float getSoundVolume() {
	return 0.4F;
}

/**
 * Called to update the entity's position/logic.
 */
public void onUpdate() {
	super.onUpdate();
	this.headRotationCourseOld = this.headRotationCourse;

	this.headRotationCourse += (0.0F - this.headRotationCourse) * 0.4F;
}

@SideOnly(Side.CLIENT)
public float getInterestedAngle(float p_70917_1_) {
	return (this.headRotationCourseOld + (this.headRotationCourse - this.headRotationCourseOld) * p_70917_1_)
			* 0.15F * (float) Math.PI;
}

public float getEyeHeight() {
	return this.height;
}

public int getVerticalFaceSpeed() {
	return this.isSitting() ? 20 : super.getVerticalFaceSpeed();
}

public boolean attackEntityAsMob(Entity entityIn) {
	boolean flag = entityIn.attackEntityFrom(DamageSource.causeMobDamage(this),
			(float) ((int) this.getEntityAttribute(SharedMonsterAttributes.ATTACK_DAMAGE).getAttributeValue()));

	if (flag) {
		this.applyEnchantments(this, entityIn);
	}

	return flag;
}

public EntityGrotKokkie createChild(EntityAgeable ageable) {
	EntityGrotKokkie kokkie = new EntityGrotKokkie(this.worldObj);
	return kokkie;
}

public boolean canMateWith(EntityAnimal otherAnimal) {
	if (otherAnimal == this) {
		return false;
	} else if (!(otherAnimal instanceof EntityGrotKokkie)) {
		return false;
	} else {
		EntityGrotKokkie entitywolf = (EntityGrotKokkie) otherAnimal;
		return this.isInLove() && entitywolf.isInLove();
	}
}

public boolean isAngry() {
	return (((Byte) this.dataManager.get(TAMED)).byteValue() & 2) != 0;
}

public void setAngry(boolean angry) {
	byte b0 = ((Byte) this.dataManager.get(TAMED)).byteValue();

	if (angry) {
		this.dataManager.set(TAMED, Byte.valueOf((byte) (b0 | 2)));
	} else {
		this.dataManager.set(TAMED, Byte.valueOf((byte) (b0 & -3)));
	}
}

public boolean shouldAttackEntity(EntityLivingBase p_142018_1_, EntityLivingBase p_142018_2_) {
	if (!(p_142018_1_ instanceof EntityCreeper) && !(p_142018_1_ instanceof EntityGhast)) {
		return p_142018_1_ instanceof EntityPlayer && p_142018_2_ instanceof EntityPlayer
				&& !((EntityPlayer) p_142018_2_).canAttackPlayer((EntityPlayer) p_142018_1_) ? false
						: !(p_142018_1_ instanceof EntityHorse) || !((EntityHorse) p_142018_1_).isTame();
	} else {
		return false;
	}
}

public void setAttackTarget(@Nullable EntityLivingBase entitylivingbaseIn) {
	super.setAttackTarget(entitylivingbaseIn);

	if (entitylivingbaseIn == null) {
		this.setAngry(false);
	} else {
		this.setAngry(true);
	}
}

public void writeEntityToNBT(NBTTagCompound compound) {
	super.writeEntityToNBT(compound);
	compound.setBoolean("Angry", this.isAngry());
}

/**
 * (abstract) Protected helper method to read subclass entity data from NBT.
 */
public void readEntityFromNBT(NBTTagCompound compound) {
	super.readEntityFromNBT(compound);
	this.setAngry(compound.getBoolean("Angry"));
}

public void onLivingUpdate() {
	super.onLivingUpdate();
	if (!this.worldObj.isRemote && this.getAttackTarget() == null && this.isAngry()) {
		this.setAngry(false);
	}
}

@Override
public boolean getCanSpawnHere() {
	return super.getCanSpawnHere() && !this.worldObj.canBlockSeeSky(this.getPosition()) && this.getPosition().getY() < 55;
}
}

[Choonster]

That looks like it should work, you'll need to debug this yourself.

 

Set a breakpoint in

EntityGrotKokkie#getCanSpawnHere

and run Minecraft in debug mode. When the breakpoint is hit, look at the entity's position in the debugger and then step through the method to see the result of each check.

 

For debugging purposes, you may want to split each check onto its own line and assign the result to a local variable.

[Egietje]

Ehm, how do I do that? 

[Choonster]

Ehm, how do I do that? 

 

Use your search engine of choice to find documentation/tutorials on how to use the debugger in your IDE.

[Egietje]

I mean the breakpoint

[Choonster]

I mean the breakpoint

 

Again, breakpoints are a feature of your IDE. There is documentation available in your IDE or on the Internet, find it and read it.

[Egietje]

I have a breakpoint but it doesn't suspend anything...

[Choonster]

I have a breakpoint but it doesn't suspend anything...

 

Are you running Minecraft in debug mode? Are the entities being spawned anywhere?

[Egietje]

Are you running Minecraft in debug mode? Are the entities being spawned anywhere?

Yes and yes

[Choonster]

Are you running Minecraft in debug mode? Are the entities being spawned anywhere?

Yes and yes

 

I'm not too sure what's going wrong.

 

Is the breakpoint definitely configured to suspend? If you set a breakpoint in the

EntityGrotKokkie

constructor, is it hit?

[Egietje]

When I set a breakpoint to the cunstructor it suspends

[Egietje]

But it isn't getting suspended when I set the breakpoint to the getCanSpawnHer method

[Draco18s]

FYI you know there's both a client thread and a server thread and that this method is only called on the server and therefore the client thread isn't paused, right?

[Egietje]

Oh

[Draco18s]

I'll look around for that option in Eclipse, but the last time I did it, it definitely didn't pause the client thread.  Mildly annoying, but workable.

[Egietje]

Well, after putting System.out.println in the boolean methods it looks like they aren't spawning under Y 55...

Here are the Y coordinates:

70

69

69

69

71

69

69

69

68

69

69

63

64

 

[jeffryfisher]

Are those the Y vals where it tried to spawn, or where it actually spawned? What did your method return when it had those Y values? What were the sky values?

 

Find a cave coordinate in your test world. Use the debugger to pause at the point where spawn coords are chosen, and then set the spawn coords to your cave's x, y, z. Then step through the program to see what happens and why. Be sure that your player entity is far enough away to allow creature spawning.

 

Also: Get help with the debugger. It is an essential tool for most non-crash bugs. Find somebody who can visit you (or whom you can visit) to spend an hour or two getting a feel for the basics (setting breakpoints, examining variables, stepping into / over / out of methods, conditional breakpoints, and poking values into variables).

 

You're not a complete Jedi modder until you can wield the debugger.

[TheMasterGabriel]

I also lowered the y level to 55, here is the full class:

package com.Egietje.KokkieMod.mobs.grot;

import java.util.UUID;

import javax.annotation.Nullable;

import com.Egietje.KokkieMod.init.KokkieSounds;
import com.Egietje.KokkieMod.mobs.KokkieLoot;
import com.google.common.base.Predicate;

import net.minecraft.block.Block;
import net.minecraft.entity.Entity;
import net.minecraft.entity.EntityAgeable;
import net.minecraft.entity.EntityLiving;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.SharedMonsterAttributes;
import net.minecraft.entity.ai.EntityAIAttackMelee;
import net.minecraft.entity.ai.EntityAIBeg;
import net.minecraft.entity.ai.EntityAIFollowOwner;
import net.minecraft.entity.ai.EntityAIFollowParent;
import net.minecraft.entity.ai.EntityAIHurtByTarget;
import net.minecraft.entity.ai.EntityAILeapAtTarget;
import net.minecraft.entity.ai.EntityAILookIdle;
import net.minecraft.entity.ai.EntityAIMate;
import net.minecraft.entity.ai.EntityAINearestAttackableTarget;
import net.minecraft.entity.ai.EntityAIOwnerHurtByTarget;
import net.minecraft.entity.ai.EntityAIOwnerHurtTarget;
import net.minecraft.entity.ai.EntityAIPanic;
import net.minecraft.entity.ai.EntityAISit;
import net.minecraft.entity.ai.EntityAISwimming;
import net.minecraft.entity.ai.EntityAITargetNonTamed;
import net.minecraft.entity.ai.EntityAITempt;
import net.minecraft.entity.ai.EntityAIWander;
import net.minecraft.entity.ai.EntityAIWatchClosest;
import net.minecraft.entity.monster.EntityCreeper;
import net.minecraft.entity.monster.EntityGhast;
import net.minecraft.entity.monster.EntityMob;
import net.minecraft.entity.monster.EntitySkeleton;
import net.minecraft.entity.passive.EntityAnimal;
import net.minecraft.entity.passive.EntityChicken;
import net.minecraft.entity.passive.EntityHorse;
import net.minecraft.entity.passive.EntityRabbit;
import net.minecraft.entity.passive.EntitySheep;
import net.minecraft.entity.passive.EntityTameable;
import net.minecraft.entity.passive.EntityWolf;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.entity.projectile.EntityArrow;
import net.minecraft.init.Items;
import net.minecraft.init.SoundEvents;
import net.minecraft.item.EnumDyeColor;
import net.minecraft.item.ItemFood;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.network.datasync.DataParameter;
import net.minecraft.network.datasync.DataSerializers;
import net.minecraft.network.datasync.EntityDataManager;
import net.minecraft.util.DamageSource;
import net.minecraft.util.EnumHand;
import net.minecraft.util.EnumParticleTypes;
import net.minecraft.util.ResourceLocation;
import net.minecraft.util.SoundEvent;
import net.minecraft.util.datafix.DataFixer;
import net.minecraft.util.math.BlockPos;
import net.minecraft.util.math.MathHelper;
import net.minecraft.world.EnumDifficulty;
import net.minecraft.world.EnumSkyBlock;
import net.minecraft.world.World;
import net.minecraft.world.storage.loot.LootTableList;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;

public class EntityGrotKokkie extends EntityTameable {
private static final DataParameter<Float> DATA_HEALTH_ID = EntityDataManager
		.<Float>createKey(EntityGrotKokkie.class, DataSerializers.FLOAT);
private float headRotationCourse;
private float headRotationCourseOld;

public EntityGrotKokkie(World worldIn) {
	super(worldIn);
	this.setSize(0.4F, 0.6F);
	this.setTamed(false);
}

protected void initEntityAI() {
	this.tasks.addTask(1, new EntityAISwimming(this));
	this.tasks.addTask(2, new EntityAIAttackMelee(this, 1.0D, true));
	this.tasks.addTask(3, new EntityAIMate(this, 1.0D));
	this.tasks.addTask(4, new EntityAIWander(this, 1.0D));
	this.tasks.addTask(5, new EntityAIWatchClosest(this, EntityPlayer.class, 8.0F));
	this.tasks.addTask(6, new EntityAILookIdle(this));
	this.tasks.addTask(7, new EntityAILeapAtTarget(this, 0.4F));
	this.tasks.addTask(8, new EntityAIFollowParent(this, 1.1D));
	this.tasks.addTask(9, new EntityAITempt(this, 0.9D, Items.CHICKEN, false));
	this.targetTasks.addTask(1, new EntityAIHurtByTarget(this, true, new Class[0]));
	this.targetTasks.addTask(2,
			new EntityAITargetNonTamed(this, EntityAnimal.class, false, new Predicate<Entity>() {
				public boolean apply(@Nullable Entity p_apply_1_) {
					return p_apply_1_ instanceof EntitySheep || p_apply_1_ instanceof EntityRabbit
							|| p_apply_1_ instanceof EntityChicken;
				}
			}));
}

@Override
protected ResourceLocation getLootTable() {
	return KokkieLoot.ENTITIES_GROT;
}

@Override
public boolean isBreedingItem(@Nullable ItemStack stack) {
	return stack == null ? false : stack.getItem() == Items.CHICKEN;
}

protected void applyEntityAttributes() {
	super.applyEntityAttributes();
	this.getEntityAttribute(SharedMonsterAttributes.MOVEMENT_SPEED).setBaseValue(0.30000001192092896D);
	this.getEntityAttribute(SharedMonsterAttributes.MAX_HEALTH).setBaseValue(2.0D);
	this.getAttributeMap().registerAttribute(SharedMonsterAttributes.ATTACK_DAMAGE).setBaseValue(0.5D);
}

protected void updateAITasks() {
	this.dataManager.set(DATA_HEALTH_ID, Float.valueOf(this.getHealth()));
}

protected void entityInit() {
	super.entityInit();
	this.dataManager.register(DATA_HEALTH_ID, Float.valueOf(this.getHealth()));
}

protected void playStepSound(BlockPos pos, Block blockIn) {
	this.playSound(SoundEvents.ENTITY_ITEMFRAME_REMOVE_ITEM, 0.15F, 1.0F);
}

public static void func_189788_b(DataFixer p_189788_0_) {
	EntityLiving.func_189752_a(p_189788_0_, "GrotKokkie");
}

protected SoundEvent getAmbientSound() {
	return this.isAngry() ? KokkieSounds.GROT_KOKKIE_ANGRY
			: (this.rand.nextInt(2) == 0 ? KokkieSounds.GROT_KOKKIE_AMBIENCE : KokkieSounds.GROT_KOKKIE_AMBIENCE);
}

protected SoundEvent getHurtSound() {
	return KokkieSounds.GROT_KOKKIE_HURT;
}

protected SoundEvent getDeathSound() {
	return KokkieSounds.GROT_KOKKIE_DEATH;
}

/**
 * Returns the volume for the sounds this mob makes.
 */
protected float getSoundVolume() {
	return 0.4F;
}

/**
 * Called to update the entity's position/logic.
 */
public void onUpdate() {
	super.onUpdate();
	this.headRotationCourseOld = this.headRotationCourse;

	this.headRotationCourse += (0.0F - this.headRotationCourse) * 0.4F;
}

@SideOnly(Side.CLIENT)
public float getInterestedAngle(float p_70917_1_) {
	return (this.headRotationCourseOld + (this.headRotationCourse - this.headRotationCourseOld) * p_70917_1_)
			* 0.15F * (float) Math.PI;
}

public float getEyeHeight() {
	return this.height;
}

public int getVerticalFaceSpeed() {
	return this.isSitting() ? 20 : super.getVerticalFaceSpeed();
}

public boolean attackEntityAsMob(Entity entityIn) {
	boolean flag = entityIn.attackEntityFrom(DamageSource.causeMobDamage(this),
			(float) ((int) this.getEntityAttribute(SharedMonsterAttributes.ATTACK_DAMAGE).getAttributeValue()));

	if (flag) {
		this.applyEnchantments(this, entityIn);
	}

	return flag;
}

public EntityGrotKokkie createChild(EntityAgeable ageable) {
	EntityGrotKokkie kokkie = new EntityGrotKokkie(this.worldObj);
	return kokkie;
}

public boolean canMateWith(EntityAnimal otherAnimal) {
	if (otherAnimal == this) {
		return false;
	} else if (!(otherAnimal instanceof EntityGrotKokkie)) {
		return false;
	} else {
		EntityGrotKokkie entitywolf = (EntityGrotKokkie) otherAnimal;
		return this.isInLove() && entitywolf.isInLove();
	}
}

public boolean isAngry() {
	return (((Byte) this.dataManager.get(TAMED)).byteValue() & 2) != 0;
}

public void setAngry(boolean angry) {
	byte b0 = ((Byte) this.dataManager.get(TAMED)).byteValue();

	if (angry) {
		this.dataManager.set(TAMED, Byte.valueOf((byte) (b0 | 2)));
	} else {
		this.dataManager.set(TAMED, Byte.valueOf((byte) (b0 & -3)));
	}
}

public boolean shouldAttackEntity(EntityLivingBase p_142018_1_, EntityLivingBase p_142018_2_) {
	if (!(p_142018_1_ instanceof EntityCreeper) && !(p_142018_1_ instanceof EntityGhast)) {
		return p_142018_1_ instanceof EntityPlayer && p_142018_2_ instanceof EntityPlayer
				&& !((EntityPlayer) p_142018_2_).canAttackPlayer((EntityPlayer) p_142018_1_) ? false
						: !(p_142018_1_ instanceof EntityHorse) || !((EntityHorse) p_142018_1_).isTame();
	} else {
		return false;
	}
}

public void setAttackTarget(@Nullable EntityLivingBase entitylivingbaseIn) {
	super.setAttackTarget(entitylivingbaseIn);

	if (entitylivingbaseIn == null) {
		this.setAngry(false);
	} else {
		this.setAngry(true);
	}
}

public void writeEntityToNBT(NBTTagCompound compound) {
	super.writeEntityToNBT(compound);
	compound.setBoolean("Angry", this.isAngry());
}

/**
 * (abstract) Protected helper method to read subclass entity data from NBT.
 */
public void readEntityFromNBT(NBTTagCompound compound) {
	super.readEntityFromNBT(compound);
	this.setAngry(compound.getBoolean("Angry"));
}

public void onLivingUpdate() {
	super.onLivingUpdate();
	if (!this.worldObj.isRemote && this.getAttackTarget() == null && this.isAngry()) {
		this.setAngry(false);
	}
}

@Override
public boolean getCanSpawnHere() {
	return super.getCanSpawnHere() && !this.worldObj.canBlockSeeSky(this.getPosition()) && this.getPosition().getY() < 55;
}
}

 

It might be worth mentioning that EntityAnimal#getCanSpawnHere (which you invoke through the super call) requires that the light level of the checked spawn block be greater than 8, which in a cave doesn't really happen (unless it chooses a spot next to lava or a torch in a mineshaft), and that the entity must spawn on a grass block (which never happens in a cave).