whenever i spawn the entity it crashes the client, then when i restart it entity is in world where it should be like nothing happened, any idea why its crashing?

 

if(!worldObj.isRemote) {

		            Entity spawn = null;

	                spawn = Ref.altarlisttier1(this.display);
	                spawn.setWorld(worldObj);

	                EntityLiving entityliving = spawn instanceof EntityLiving ? (EntityLiving)spawn : null;
                    spawn.setLocationAndAngles(pos.getX(), pos.getY()+1.25f, pos.getZ(), worldObj.rand.nextFloat() * 360.0F, 0.0F);


                        AnvilChunkLoader.spawnEntity(spawn, worldObj);
                        worldObj.playEvent(2004, pos, 0);

                        if (entityliving != null)
                        {
                            entityliving.spawnExplosionParticle();
                        }
		        }

 

Description: Ticking entity

java.lang.NullPointerException: Ticking entity
at net.minecraft.entity.ai.EntityAITasks.onUpdateTasks(EntityAITasks.java:64)
at net.minecraft.entity.EntityLiving.updateEntityActionState(EntityLiving.java:846)
at net.minecraft.entity.EntityLivingBase.onLivingUpdate(EntityLivingBase.java:2392)
at net.minecraft.entity.EntityLiving.onLivingUpdate(EntityLiving.java:643)
at net.minecraft.entity.EntityAgeable.onLivingUpdate(EntityAgeable.java:178)
at net.minecraft.entity.passive.EntityAnimal.onLivingUpdate(EntityAnimal.java:47)
at net.minecraft.entity.EntityLivingBase.onUpdate(EntityLivingBase.java:2218)
at net.minecraft.entity.EntityLiving.onUpdate(EntityLiving.java:342)
at net.minecraft.world.World.updateEntityWithOptionalForce(World.java:2106)
at net.minecraft.world.WorldServer.updateEntityWithOptionalForce(WorldServer.java:872)
at net.minecraft.world.World.updateEntity(World.java:2073)
at net.minecraft.world.World.updateEntities(World.java:1886)
at net.minecraft.world.WorldServer.updateEntities(WorldServer.java:644)
at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:783)
at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:687)
at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:156)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:536)
at java.lang.Thread.run(Unknown Source)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Thread: Client thread
Stacktrace:
at net.minecraft.entity.ai.EntityAITasks.onUpdateTasks(EntityAITasks.java:64)
at net.minecraft.entity.EntityLiving.updateEntityActionState(EntityLiving.java:846)
at net.minecraft.entity.EntityLivingBase.onLivingUpdate(EntityLivingBase.java:2392)
at net.minecraft.entity.EntityLiving.onLivingUpdate(EntityLiving.java:643)
at net.minecraft.entity.EntityAgeable.onLivingUpdate(EntityAgeable.java:178)
at net.minecraft.entity.passive.EntityAnimal.onLivingUpdate(EntityAnimal.java:47)
at net.minecraft.entity.EntityLivingBase.onUpdate(EntityLivingBase.java:2218)
at net.minecraft.entity.EntityLiving.onUpdate(EntityLiving.java:342)
at net.minecraft.world.World.updateEntityWithOptionalForce(World.java:2106)
at net.minecraft.world.WorldServer.updateEntityWithOptionalForce(WorldServer.java:872)
at net.minecraft.world.World.updateEntity(World.java:2073)

-- Entity being ticked --
Details:
Entity Type: rv.voidbeast (com.ravvoid.entity.mob.EntityVoidBeast)
Entity ID: 0
Entity Name: Void Beast
Entity's Exact location: 237.00, 70.25, 303.00
Entity's Block location: World: (237,70,303), Chunk: (at 13,4,15 in 14,18; contains blocks 224,0,288 to 239,255,303), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Entity's Momentum: 0.00, 0.00, 0.00
Entity's Passengers: []
Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
at net.minecraft.world.World.updateEntities(World.java:1886)
at net.minecraft.world.WorldServer.updateEntities(WorldServer.java:644)

-- Affected level --
Details:
Level name: New World
All players: 1 total; [EntityPlayerMP['Player368'/314, l='New World', x=231.35, y=69.00, z=301.42]]
Chunk stats: ServerChunkCache: 639 Drop: 0
Level seed: 9049979599259575510
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options: 
Level spawn location: World: (256,64,256), Chunk: (at 0,4,0 in 16,16; contains blocks 256,0,256 to 271,255,271), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 12466 game time, 12466 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 87931 (now: false), thunder time: 115727 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:783)
at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:687)
at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:156)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:536)
at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
Minecraft Version: 1.10.2
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_91, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 456852240 bytes (435 MB) / 1038876672 bytes (990 MB) up to 1038876672 bytes (990 MB)
JVM Flags: 3 total; -Xincgc -Xmx1024M -Xms1024M
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
FML: MCP 9.32 Powered by Forge 12.18.1.2011 4 mods loaded, 4 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJAAAA	mcp{9.19} [Minecraft Coder Pack] (minecraft.jar) 
UCHIJAAAA	FML{8.0.99.99} [Forge Mod Loader] (forgeSrc-1.10.2-12.18.1.2011.jar) 
UCHIJAAAA	Forge{12.18.1.2011} [Minecraft Forge] (forgeSrc-1.10.2-12.18.1.2011.jar) 
UCHIJAAAA	rv{1.10.2} [Ravenous Void] (bin) 
Loaded coremods (and transformers): 
GL info: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [EntityPlayerMP['Player368'/314, l='New World', x=231.35, y=69.00, z=301.42]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'

 

https://github.com/Zerahi/RavenousVoid/blob/master/src/main/java/com/ravvoid/tileentity/TileEntityAltar.java

Include the whole Entity class please.

For one you are spawning the entity even if it is null.

 

	                EntityLiving entityliving = spawn instanceof EntityLiving ? (EntityLiving)spawn : null;
                    spawn.setLocationAndAngles(pos.getX(), pos.getY()+1.25f, pos.getZ(), worldObj.rand.nextFloat() * 360.0F, 0.0F);


                        AnvilChunkLoader.spawnEntity(spawn, worldObj);

its not null ever its only triggered if the Ref.altarlisttier1(this.display) != null;

and mob spawns fine from a spawn egg no crash

 

package com.ravvoid.entity.mob;

import com.google.common.base.Predicate;
import com.ravvoid.Ref;

import javax.annotation.Nullable;
import net.minecraft.block.Block;
import net.minecraft.entity.Entity;
import net.minecraft.entity.EntityAgeable;
import net.minecraft.entity.EntityCreature;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.IEntityLivingData;
import net.minecraft.entity.SharedMonsterAttributes;
import net.minecraft.entity.ai.EntityAIAttackMelee;
import net.minecraft.entity.ai.EntityAIFollowParent;
import net.minecraft.entity.ai.EntityAIHurtByTarget;
import net.minecraft.entity.ai.EntityAILookIdle;
import net.minecraft.entity.ai.EntityAINearestAttackableTarget;
import net.minecraft.entity.ai.EntityAIPanic;
import net.minecraft.entity.ai.EntityAISwimming;
import net.minecraft.entity.ai.EntityAIWander;
import net.minecraft.entity.ai.EntityAIWatchClosest;
import net.minecraft.entity.ai.attributes.AttributeModifier;
import net.minecraft.entity.passive.EntityAnimal;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.init.SoundEvents;
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.ResourceLocation;
import net.minecraft.util.SoundEvent;
import net.minecraft.util.math.BlockPos;
import net.minecraft.util.math.MathHelper;
import net.minecraft.world.DifficultyInstance;
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 EntityVoidBeast extends EntityAnimal
{

    public EntityVoidBeast(World world)
    {
        super(world);
        this.setSize(0.9F, 1.1F);
    }

    /**
     * Checks if the parameter is an item which this animal can be fed to breed it (wheat, carrots or seeds depending on
     * the animal type)
     */
    public boolean isBreedingItem(ItemStack stack)
    {
        return false;
    }

    protected void initEntityAI()
    {
        super.initEntityAI();
        this.tasks.addTask(0, new EntityAISwimming(this));
        this.tasks.addTask(1, new EntityAIAttackMelee(this, 1.0D, false));
        this.tasks.addTask(2, new EntityAIWander(this, 1.0D));
        this.tasks.addTask(3, new EntityAIWatchClosest(this, EntityPlayer.class, 6.0F));
        this.tasks.addTask(4, new EntityAILookIdle(this));
        this.targetTasks.addTask(2, new EntityAINearestAttackableTarget(this, EntityPlayer.class, true));
    }

    protected void applyEntityAttributes()
    {
        super.applyEntityAttributes();
        this.getEntityAttribute(SharedMonsterAttributes.MAX_HEALTH).setBaseValue(15.0D);
        this.getEntityAttribute(SharedMonsterAttributes.FOLLOW_RANGE).setBaseValue(20.0D);
        this.getEntityAttribute(SharedMonsterAttributes.MOVEMENT_SPEED).setBaseValue(0.25D);
        this.getAttributeMap().registerAttribute(SharedMonsterAttributes.ATTACK_DAMAGE);
        this.getEntityAttribute(SharedMonsterAttributes.ATTACK_DAMAGE).setBaseValue(3.0D);
    }

    protected SoundEvent getAmbientSound()
    {
        return SoundEvents.field_190026_er;
    }

    protected SoundEvent getHurtSound()
    {
        return SoundEvents.field_190029_eu;
    }

    protected SoundEvent getDeathSound()
    {
        return SoundEvents.field_190028_et;
    }

    protected void playStepSound(BlockPos pos, Block blockIn)
    {
        this.playSound(SoundEvents.field_190030_ev, 0.15F, 1.0F);
    }


    @Nullable
    protected ResourceLocation getLootTable()
    {
        return Ref.VOIDBEAST;
    }

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

    /**
     * (abstract) Protected helper method to write subclass entity data to NBT.
     */
    public void writeEntityToNBT(NBTTagCompound compound)
    {
        super.writeEntityToNBT(compound);
    }


    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;
    }



@Override
public EntityAgeable createChild(EntityAgeable ageable) {
	// TODO Auto-generated method stub
	return null;
}
}

Is your Void Beast a hostile entity, if so you might be better to extend something that doesn't extend EntityAgeable

changed to EntityVoidBeast extends EntityMob, no change

New Crash Report please.

Entities aren't singletons, you can't just store a single instance and reuse it. You need to create a new instance every time you want to spawn one.

Also it seems when you create that single instance, thank you for pointing that out Choonster, you are passing in a null parameter for world.

yeah i see that now, what would be the best way to refer to an entity so i can spawn one of that type later, EntityRegistry? or just store the entity.class

 

All entities need to be registered with the EntityRegistry, but no instead of

 

public static Entity altarlisttier1(ItemStack item) {

	for (Entry<ItemStack, Entity> entry : altarlisttier1.entrySet())
        {
            if (ItemStack.areItemsEqual(item, (ItemStack)entry.getKey()))
            {
            	return entry.getValue();
            }
            else {
            	return null;
            }
        }
	return null;
}

 

Some thing like

public static Entity getEntityFromItemStackInAltar(World world, ItemStack stack) {
     // Only needs either instanceof or ==
     if (stack != null && (stack.getItem() instanceof ItemClass || stack.getItem() == Items.diamond)) {
          return new Entity(world);
     }
}

makes sense, i had just went of the furnace recipe list, still kinda new to modding, thanks both of you

Happy modding to you, and I'm glad I could help. write Solved in the topic subject.

just replaced the ref with a string and made a new object on each check with a switch for string name to new entity output and no crashes