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[1.12] Minecraft Crashes on entering the world during testing AI

nil

By nil
in Modder Support

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nil Stone Miner

nil

Posted
Posted

When i tried to Override

protected void initEntityAI()

the game crashes upon entering a world containing my custom entity.

 

The Error is the following :

Entity's Vehicle: ~~ERROR~~ NullPointerException: null

How do i fix this?

nil Stone Miner

nil

Posted
  • Author
Posted

The Crash report is added as a file below, this is the part of the class which causes the crash:

 

     @Override
    protected void initEntityAI()
    {
        this.entityAIEatGrass = new EntityAIEatGrass(this);
       this.tasks.addTask(0, new EntityAISwimming(this));
        this.tasks.addTask(1, new EntityAIPanic(this, 1.25D));
        this.tasks.addTask(2, new EntityAIMate(this, 1.0D));
        this.tasks.addTask(3, new EntityAITempt(this, 1.1D, Items.WHEAT, false));
        this.tasks.addTask(4, new EntityAIFollowParent(this, 1.1D));
        this.tasks.addTask(5, this.entityAIEatGrass);
        this.tasks.addTask(6, new EntityAIWanderAvoidWater(this, 1.0D));
        this.tasks.addTask(7, new EntityAIWatchClosest(this, EntityPlayer.class, 6.0F));
        this.tasks.addTask(8, new EntityAILookIdle(this));
        //this.targetTasks.addTask(1, new EntityIbex.AIHurtByAggressor(this));
        //this.targetTasks.addTask(2, new EntityIbex.AITargetAggressor(this));
    }

crash-2019-10-30_17.42.26-server.txt

nil Stone Miner

nil

Posted
  • Author
Posted (edited) 
package JophiMa.myst.entity;

import javax.annotation.Nullable;

import JophiMa.myst.util.handlers.LootTableHandler;
import net.minecraft.entity.Entity;
import net.minecraft.entity.EntityAgeable;
import net.minecraft.entity.EntityCreature;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.ai.EntityAIEatGrass;
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.EntityAIWanderAvoidWater;
import net.minecraft.entity.ai.EntityAIWatchClosest;
import net.minecraft.entity.item.EntityItem;
import net.minecraft.entity.monster.EntityPigZombie;
import net.minecraft.entity.passive.EntitySheep;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.init.Blocks;
import net.minecraft.init.Items;
import net.minecraft.init.SoundEvents;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.util.EnumHand;
import net.minecraft.util.ResourceLocation;
import net.minecraft.world.World;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;

public class EntityIbex extends EntitySheep
{
    private float ageWidth = 0.9F;
    private float ageHeight = 1.4F;
    private int angerLevel;
    private EntityAIEatGrass entityAIEatGrass;
    
    public EntityIbex(World worldIn)
    {
        super(worldIn);
        this.setSize(0.9F, 1.4F);
        this.setSheared(true);
    }

    @Override
    public void eatGrassBonus()
    {
        if (this.isChild())
        {
            this.addGrowth(10);
        }
    }
    
     /*@Override
    protected void initEntityAI()
    {
        this.entityAIEatGrass = new EntityAIEatGrass(this);
       this.tasks.addTask(0, new EntityAISwimming(this));
        this.tasks.addTask(1, new EntityAIPanic(this, 1.25D));
        this.tasks.addTask(2, new EntityAIMate(this, 1.0D));
        this.tasks.addTask(3, new EntityAITempt(this, 1.1D, Items.WHEAT, false));
        this.tasks.addTask(4, new EntityAIFollowParent(this, 1.1D));
        this.tasks.addTask(5, this.entityAIEatGrass);
        this.tasks.addTask(6, new EntityAIWanderAvoidWater(this, 1.0D));
        this.tasks.addTask(7, new EntityAIWatchClosest(this, EntityPlayer.class, 6.0F));
        this.tasks.addTask(8, new EntityAILookIdle(this));
        //this.targetTasks.addTask(1, new EntityIbex.AIHurtByAggressor(this));
        //this.targetTasks.addTask(2, new EntityIbex.AITargetAggressor(this));
    }*/
    
    @Nullable
    @Override
    protected ResourceLocation getLootTable()
    {
        return LootTableHandler.ENTITIES_IBEX;
    }
    
    @Override
    public EntitySheep createChild(EntityAgeable ageable)
    {
        EntityIbex entityibex1 = new EntityIbex(this.world);
        entityibex1.setGrowingAge(-40);
        return entityibex1;
    }
    

    
    /*private void becomeAngryAt(Entity entity)
    {
        this.angerLevel = 400 + this.rand.nextInt(400);

        if (entity instanceof EntityLivingBase)
        {
            this.setRevengeTarget((EntityLivingBase)entity);
        }
    }

    public boolean isAngry()
    {
        return this.angerLevel > 0;
    }
    
    static class AIHurtByAggressor extends EntityAIHurtByTarget
    {
        public AIHurtByAggressor(EntityIbex entity)
        {
            super(entity, true);
        }

        protected void setEntityAttackTarget(EntityCreature creatureIn, EntityLivingBase entityLivingBaseIn)
        {
            super.setEntityAttackTarget(creatureIn, entityLivingBaseIn);

            if (creatureIn instanceof EntityIbex)
            {
                ((EntityIbex)creatureIn).becomeAngryAt(entityLivingBaseIn);
            }
        }
    }
        
    static class AITargetAggressor extends EntityAINearestAttackableTarget<EntityPlayer>
    {
        public AITargetAggressor(EntityIbex entity)
        {
            super(entity, EntityPlayer.class, true);
        }

        /**
         * Returns whether the EntityAIBase should begin execution.
         */
        /*public boolean shouldExecute()
        {
            return ((EntityIbex)this.taskOwner).isAngry() && super.shouldExecute();
        }
    }*/
}

Btw the reason that it's identical is because i tried to see if exactly copying the function from the extended class would fix this issue. Sadly, it doesn't.

Edited by diesieben07
syntax highlighting
nil Stone Miner

nil

Posted
  • Author
Posted
On 10/30/2019 at 11:31 PM, diesieben07 said:

if you override initEntityAI, but don't call super

Do you mean super.initEntityAI() ?

 

If i use this, it will still run tasks deleted from the overridden method.

Basically, what i'm trying to do is to remove

this.tasks.addTask(1, new EntityAIPanic(this, 1.25D));

And have it attack the player instead.

nil Stone Miner

nil

Posted
  • Author
Posted
On 11/2/2019 at 8:56 PM, diesieben07 said:

To remove a task, first call super to add all the normal tasks, then remove the tasks you dont want from EntityAITasks#taskEntries

Both this.tasks.removeTask() and this.tasks.EntityAITasks.remove() don't work with a new instance of the task i want to remove. How do i (or do i need to) get the specific instances?

nil Stone Miner

nil

Posted
  • Author
Posted

Using this:

        for (EntityAITaskEntry task : this.tasks.taskEntries)
        {
            if (task.priority == 1)
            {
                this.tasks.taskEntries.remove(task);
            }
        }

causes the entity to not spawn with the following Error Message:

 

[23:55:37] [Server thread/ERROR] [FML]: Encountered an exception while constructing entity 'jmyst:ibex'
java.lang.reflect.InvocationTargetException: null
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_211]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_211]
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_211]
    at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.8.0_211]
    at net.minecraftforge.fml.common.registry.EntityEntryBuilder$ConstructorFactory.apply(EntityEntryBuilder.java:306) [EntityEntryBuilder$ConstructorFactory.class:?]
    at net.minecraftforge.fml.common.registry.EntityEntryBuilder$ConstructorFactory.apply(EntityEntryBuilder.java:292) [EntityEntryBuilder$ConstructorFactory.class:?]
    at net.minecraftforge.fml.common.registry.EntityEntry.newInstance(EntityEntry.java:68) [EntityEntry.class:?]
    at net.minecraft.entity.EntityList.createEntityByIDFromName(EntityList.java:244) [EntityList.class:?]
    at net.minecraft.item.ItemMonsterPlacer.spawnCreature(ItemMonsterPlacer.java:242) [ItemMonsterPlacer.class:?]
    at net.minecraft.item.ItemMonsterPlacer.onItemUse(ItemMonsterPlacer.java:98) [ItemMonsterPlacer.class:?]
    at net.minecraftforge.common.ForgeHooks.onPlaceItemIntoWorld(ForgeHooks.java:876) [ForgeHooks.class:?]
    at net.minecraft.item.ItemStack.onItemUse(ItemStack.java:200) [ItemStack.class:?]
    at net.minecraft.server.management.PlayerInteractionManager.processRightClickBlock(PlayerInteractionManager.java:507) [PlayerInteractionManager.class:?]
    at net.minecraft.network.NetHandlerPlayServer.processTryUseItemOnBlock(NetHandlerPlayServer.java:769) [NetHandlerPlayServer.class:?]
    at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.processPacket(CPacketPlayerTryUseItemOnBlock.java:68) [CPacketPlayerTryUseItemOnBlock.class:?]
    at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.processPacket(CPacketPlayerTryUseItemOnBlock.java:13) [CPacketPlayerTryUseItemOnBlock.class:?]
    at net.minecraft.network.PacketThreadUtil$1.run(PacketThreadUtil.java:21) [PacketThreadUtil$1.class:?]
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_211]
    at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_211]
    at net.minecraft.util.Util.runTask(Util.java:53) [Util.class:?]
    at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:798) [MinecraftServer.class:?]
    at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:743) [MinecraftServer.class:?]
    at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:192) [IntegratedServer.class:?]
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:592) [MinecraftServer.class:?]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_211]
Caused by: java.util.ConcurrentModificationException
    at java.util.LinkedHashMap$LinkedHashIterator.nextNode(Unknown Source) ~[?:1.8.0_211]
    at java.util.LinkedHashMap$LinkedKeyIterator.next(Unknown Source) ~[?:1.8.0_211]

Draco18s Reality Controller

Draco18s

Posted
Posted

You can't modify a collection while you loop over it. That's why its called a ConcurrentModificationException.

Apparently I'm a complete and utter jerk and come to this forum just like to make fun of people, be confrontational, and make your personal life miserable.  If you think this is the case, JUST REPORT ME.  Otherwise you're just going to get reported when you reply to my posts and point it out, because odds are, I was trying to be nice.

 

Exception: If you do not understand Java, I WILL NOT HELP YOU and your thread will get locked.

 

DO NOT PM ME WITH PROBLEMS. No help will be given.

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