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[1.6.4] [SOLVED!!!!] Custom Mob Not Saving NBTDATA


pokeyletsplays
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i am currently trying to make a mob that is tamable but the integers and strings are not being saved, any ideas? The only thing that is being saved is the slime size but that came with the slime code i copied over.

 

package Main.Pokey.Mine_EE_Mobs;

import java.util.Random;

import net.minecraft.block.Block;
import net.minecraft.client.Minecraft;
import net.minecraft.entity.Entity;
import net.minecraft.entity.EntityLiving;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.SharedMonsterAttributes;
import net.minecraft.entity.monster.IMob;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.potion.Potion;
import net.minecraft.potion.PotionEffect;
import net.minecraft.util.DamageSource;
import net.minecraft.util.MathHelper;
import net.minecraft.world.World;
import net.minecraft.world.WorldType;
import net.minecraft.world.chunk.Chunk;

public class EntityEnderSlime extends EntityLiving implements IMob
{
public int Teleport = 1;
public int Head = 0;
public String username;
    public float squishAmount;
    public float squishFactor;
    public float prevSquishFactor;

    /** the time between each jump of the slime */
    private int slimeJumpDelay;
    private int TPin;

    public EntityEnderSlime(World par1World)
    {
        super(par1World);
        int i = 1 << this.rand.nextInt(3);
        this.yOffset = 0.0F;
        this.slimeJumpDelay = this.rand.nextInt(20) + 10;
        this.setSlimeSize(i);
    }

    protected void entityInit()
    {
        super.entityInit();
        this.dataWatcher.addObject(16, new Byte((byte)1));
    }

    protected void setSlimeSize(int par1)
    {
        this.dataWatcher.updateObject(16, new Byte((byte)par1));
        this.setSize(0.6F * (float)par1, 0.6f * (float)par1);
        this.setPosition(this.posX, this.posY, this.posZ);
        if(this.getSlimeSize() == 1){
            this.getEntityAttribute(SharedMonsterAttributes.maxHealth).setAttribute((5D));
            }
        if(this.getSlimeSize() > 1){
            this.getEntityAttribute(SharedMonsterAttributes.maxHealth).setAttribute((10D));
            }
        this.setHealth(this.getMaxHealth());
        this.experienceValue = par1;
    }

    /**
     * Returns the size of the slime.
     */
    public int getSlimeSize()
    {
        return this.dataWatcher.getWatchableObjectByte(16);
    }


    /**
     * Returns the name of a particle effect that may be randomly created by EntitySlime.onUpdate()
     */
    protected String getSlimeParticle()
    {
        return "portal";
    }

    /**
     * Returns the name of the sound played when the slime jumps.
     */
    protected String getJumpSound()
    {
        return "";
    }

    /**
     * Called to update the entity's position/logic.
     */
    public void onUpdate()
    {   
    	super.onUpdate();
    	
    	if(username != null)
    	{
    		this.setSlimeSize(1);
    		if(this.Head != 0){
    			this.addPotionEffect(new PotionEffect(Potion.resistance.id,75, 99));
    			this.addPotionEffect(new PotionEffect(Potion.heal.id,75, 99));
    	}
    	}
    	
    	if(Head == 1 && this.username != null)
    	{
    		//String P;
    		//Minecraft.getMinecraft().thePlayer;
    		this.head(Minecraft.getMinecraft().thePlayer);
    		if(Minecraft.getMinecraft().thePlayer.username == this.username){
             	this.setLocationAndAngles((double)Minecraft.getMinecraft().thePlayer.posX  + 0.0D, (double)Minecraft.getMinecraft().thePlayer.posY + 0.2D, (double)Minecraft.getMinecraft().thePlayer.posZ +  0.0D, 0.0F, 0.0F);
             	}
    	}
    	
    	Random TPXYZ = new Random();
    	TPin = TPXYZ.nextInt(3);
    	
    	this.fallDistance = 0;
    	if(Teleport > 3)
    	{
    		Teleport = 3;
    	}    	
    	
    	if(worldObj.isBlockOpaqueCube((int)posX, (int)posY, (int)posZ) == true && !this.isInWater() || worldObj.isBlockOpaqueCube((int)posX, (int)posY + 1, (int)posZ) == true && !this.isInWater())
    	{
    		this.addPotionEffect(new PotionEffect(Potion.resistance.id,75, 99));
        	if(!worldObj.isRemote){
            	this.setLocationAndAngles((double)posX  + 0.5D, (double)posY + 2.5D, (double)posZ +  0.5D, 0.0F, 0.0F);
            	this.Teleport();
            	}
    		
    		this.playSound("mob.endermen.portal", 1.0F, 1.0F);
    	}
    	
    	if(this.isInWater())
    	{
        	if(!worldObj.isRemote){
            	this.Teleport();
            	}
    	}
    	
        if (!this.worldObj.isRemote && this.worldObj.difficultySetting == 0 && this.getSlimeSize() > 0)
        {
            this.isDead = true;
        }

        this.squishFactor += (this.squishAmount - this.squishFactor) * 0.5F;
        this.prevSquishFactor = this.squishFactor;
        boolean flag = this.onGround;
        super.onUpdate();
        int i;

        if (this.onGround && !flag)
        {
            i = this.getSlimeSize();

            for (int j = 0; j < i * 8; ++j)
            {
                float f = this.rand.nextFloat() * (float)Math.PI * 2.0F;
                float f1 = this.rand.nextFloat() * 0.5F + 0.5F;
                float f2 = MathHelper.sin(f) * (float)i * 0.5F * f1;
                float f3 = MathHelper.cos(f) * (float)i * 0.5F * f1;
                this.worldObj.spawnParticle(this.getSlimeParticle(), this.posX + (double)f2, this.boundingBox.minY, this.posZ + (double)f3, 0.0D, 0.0D, 0.0D);
            }

            if (this.makesSoundOnLand())
            {
                this.playSound(this.getJumpSound(), this.getSoundVolume(), ((this.rand.nextFloat() - this.rand.nextFloat()) * 0.2F + 1.0F) / 0.8F);
            }

            this.squishAmount = -0.5F;
        }
        else if (!this.onGround && flag)
        {
            this.squishAmount = 1.0F;
        }

        this.alterSquishAmount();

        if (this.worldObj.isRemote)
        {
            i = this.getSlimeSize();
            this.setSize(0.6F * (float)i, 0.6F * (float)i);
        }        
    }

 private void head(EntityPlayer par1EntityPlayer) {

	 this.motionX = 0;
	 this.motionY = 0;
	 this.motionZ = 0;

}

public boolean hitByEntity(Entity entity)
    {
	 if (entity instanceof EntityPlayer) {
		if(((EntityPlayer)entity).getCurrentEquippedItem() != null || ((EntityPlayer)entity).getCurrentEquippedItem() == null && ((EntityPlayer)entity).username != this.username)
	      {
	        if(Teleport >= 1 && this.getHealth() > 1)
	        {
	        	this.Teleport();
	        	return true;
	        }
	        else{
	        	 return false;
	        }

	         }
		}

	 else
	 {
        return true;
    }
return false;
    }
    
    private void Teleport() {
    	Random TP = new Random();
    	Random TP1 = new Random();
    	int TeleportX = TP.nextInt(10+1);
    	int TeleportZ = TP1.nextInt(10+1);
    	if(!worldObj.isRemote && TPin == 3){
        	this.setLocationAndAngles((double)posX + 0.5D, (double)posY + 0.5D, (double)posZ + TeleportZ +  0.5D, 0.0F, 0.0F);
        	}
    	else if(!worldObj.isRemote && TPin == 2){
        	this.setLocationAndAngles((double)posX + TeleportX + 0.5D, (double)posY + 0.5D, (double)posZ +  0.5D, 0.0F, 0.0F);
        	}
    	else if(!worldObj.isRemote && TPin == 1){
        	this.setLocationAndAngles((double)posX + 0.5D, (double)posY + 0.5D, (double)posZ - TeleportZ +  0.5D, 0.0F, 0.0F);
        	}
    	else if(!worldObj.isRemote && TPin == 0){
        	this.setLocationAndAngles((double)posX - TeleportX + 0.5D, (double)posY + 0.5D, (double)posZ +  0.5D, 0.0F, 0.0F);
        	}
        this.playSound("mob.endermen.portal", 1.0F, 1.0F);
    	Teleport--;

}
    
    
    public boolean attackEntityAsMob(Entity entity) {
	 super.attackEntityAsMob(entity);
	    	
	   Teleport++;
	return true;
	    	
	    	}


protected void updateEntityActionState()
    {
        this.despawnEntity();
        EntityPlayer entityplayer = this.worldObj.getClosestVulnerablePlayerToEntity(this, 16.0D);

        if (entityplayer != null)
        {
            this.faceEntity(entityplayer, 10.0F, 20.0F);
        }

        if (this.onGround && this.slimeJumpDelay-- <= 0)
        {
            this.slimeJumpDelay = this.getJumpDelay();

            if (entityplayer != null)
            {
                this.slimeJumpDelay /= 3;
            }

            this.isJumping = true;

            if (this.makesSoundOnJump())
            {
                this.playSound(this.getJumpSound(), this.getSoundVolume(), ((this.rand.nextFloat() - this.rand.nextFloat()) * 0.2F + 1.0F) * 0.8F);
            }

            this.moveStrafing = 1.0F - this.rand.nextFloat() * 2.0F;
            this.moveForward = (float)(1 * this.getSlimeSize());
        }
        else
        {
            this.isJumping = false;

            if (this.onGround)
            {
                this.moveStrafing = this.moveForward = 0.0F;
            }
        }
    }


 public boolean interact(EntityPlayer par1EntityPlayer)
    {
        ItemStack itemstack = par1EntityPlayer.inventory.getCurrentItem();

        if (itemstack != null && itemstack.itemID == Item.leash.itemID && !par1EntityPlayer.capabilities.isCreativeMode)
        {
        	username = par1EntityPlayer.username;
            return true;
        }
        if (itemstack == null && !par1EntityPlayer.capabilities.isCreativeMode && this.Head == 1 && this.username == par1EntityPlayer.username)
        {
        	Head = 0;
            return true;
        }
        if (itemstack == null && !par1EntityPlayer.capabilities.isCreativeMode && this.Head == 0 && this.username == par1EntityPlayer.username)
        {
        	Head = 1;
            return true;
        }
        if (itemstack != null && itemstack.itemID == Item.flintAndSteel.itemID && !par1EntityPlayer.capabilities.isCreativeMode)
        {
        	Head = 0;
        	username = null;
            return true;
        }
        else
        {
            return super.interact(par1EntityPlayer);
        }
    }

    protected void alterSquishAmount()
    {
        this.squishAmount *= 0.6F;
    }

    /**
     * Gets the amount of time the slime needs to wait between jumps.
     */
    protected int getJumpDelay()
    {
        return this.rand.nextInt(15) + 10;
    }

    protected EntityEnderSlime createInstance()
    {
        return new EntityEnderSlime(this.worldObj);
    }

    /**
     * Will get destroyed next tick.
     */
    public void setDead()
    {
        int i = this.getSlimeSize();

        if (!this.worldObj.isRemote && i > 1 && this.getHealth() <= 0.0F)
        {
            int j = 2 + this.rand.nextInt(3);

            for (int k = 0; k < j; ++k)
            {
                float f = ((float)(k % 2) - 0.5F) * (float)i / 4.0F;
                float f1 = ((float)(k / 2) - 0.5F) * (float)i / 4.0F;
                EntityEnderSlime entityslime = this.createInstance();
                entityslime.setSlimeSize(i / 2);
                entityslime.setLocationAndAngles(this.posX + (double)f, this.posY + 0.5D, this.posZ + (double)f1, this.rand.nextFloat() * 360.0F, 0.0F);
                this.worldObj.spawnEntityInWorld(entityslime);
            }
        }

        super.setDead();
    }

    /**
     * Called by a player entity when they collide with an entity
     */
    public void onCollideWithPlayer(EntityPlayer par1EntityPlayer)
    {
    	
        if (this.canDamagePlayer())
        {
        	Teleport++;
            int i = this.getSlimeSize();

            if (par1EntityPlayer.username != this.username && this.canEntityBeSeen(par1EntityPlayer) && this.getDistanceSqToEntity(par1EntityPlayer) < 0.6D * (double)i * 0.6D * (double)i && par1EntityPlayer.attackEntityFrom(DamageSource.causeMobDamage(this), (float)this.getAttackStrength()))
            {
                this.playSound("mob.attack", 1.0F, (this.rand.nextFloat() - this.rand.nextFloat()) * 0.2F + 1.0F);
            }
        }
        else
        {
        	Teleport = 3;
        }
    }

    /**
     * Indicates weather the slime is able to damage the player (based upon the slime's size)
     */
    protected boolean canDamagePlayer()
    {
        return this.getSlimeSize() >= 1;
    }

    /**
     * Gets the amount of damage dealt to the player when "attacked" by the slime.
     */
    protected int getAttackStrength()
    {
        return this.getSlimeSize() +1;
    }

    /**
     * Returns the sound this mob makes when it is hurt.
     */
    protected String getHurtSound()
    {
        return "mob.slime." + (this.getSlimeSize() > 1 ? "big" : "small");
    }

    /**
     * Returns the sound this mob makes on death.
     */
    protected String getDeathSound()
    {
        return "mob.slime." + (this.getSlimeSize() > 1 ? "big" : "small");
    }

    /**
     * Returns the item ID for the item the mob drops on death.
     */
    protected int getDropItemId()
    {
        return this.getSlimeSize() == 1 ? Item.slimeBall.itemID : 0;
    }
    
    /**
     * Determines if an entity can be despawned, used on idle far away entities
     */
    protected boolean canDespawn()
    {
        if( this.username == null && this.ticksExisted > 2400)
        {
        	return false;
        }
	return true;
    }

    /**
     * Checks if the entity's current position is a valid location to spawn this entity.
     */
    public boolean getCanSpawnHere()
    {
        Chunk chunk = this.worldObj.getChunkFromBlockCoords(MathHelper.floor_double(this.posX), MathHelper.floor_double(this.posZ));

        if(worldObj.isDaytime())
        {
        	return false;
        }
        
        if(worldObj.provider.terrainType == WorldType.FLAT)
        {
        	return false;
        }
        else
        {
        	return true;
        }
    }
    
    /**
     * Returns the volume for the sounds this mob makes.
     */
    protected float getSoundVolume()
    {
        return 0.4F * (float)this.getSlimeSize();
    }

    /**
     * The speed it takes to move the entityliving's rotationPitch through the faceEntity method. This is only currently
     * use in wolves.
     */
    public int getVerticalFaceSpeed()
    {
        return 0;
    }

    /**
     * Returns true if the slime makes a sound when it jumps (based upon the slime's size)
     */
    protected boolean makesSoundOnJump()
    {
        return this.getSlimeSize() > 0;
    }

    /**
     * Returns true if the slime makes a sound when it lands after a jump (based upon the slime's size)
     */
    protected boolean makesSoundOnLand()
    {
        return this.getSlimeSize() > 2;
    }
    
    /**
     * (abstract) Protected helper method to write subclass entity data to NBT.
     */
    
    public void writeEntityToNBT(NBTTagCompound par1NBTTagCompound)
    {
        super.writeEntityToNBT(par1NBTTagCompound);
        par1NBTTagCompound.setInteger("Size", this.getSlimeSize() - 1);
        par1NBTTagCompound.setInteger("TP_Slime", this.Teleport);
        par1NBTTagCompound.setString("User_Slime", this.username);
    }

    /**
     * (abstract) Protected helper method to read subclass entity data from NBT.
     */
    public void readEntityFromNBT(NBTTagCompound par1NBTTagCompound)
    {
        super.readEntityFromNBT(par1NBTTagCompound);
        this.setSlimeSize(par1NBTTagCompound.getInteger("Size") + 1);
        this.Teleport = par1NBTTagCompound.getInteger("TP_Slime");
        this.username = par1NBTTagCompound.getString("User_Slime");
        System.out.println("Username =" + this.username);
    }

    
}

Its best to only ask questions when you did most of the work yourself.

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First of all: Update, 1.6.4 is ancient.

 

Then: You are using the client-side player here (Minecraft.getMinecraft().thePlayer). That's not going to work.

I realize about 1.6.4 being ancient but I have my reasons. Note:(I plan on updating soon)

So I referenced the player server side and it still doesn't save the NBT data

Its best to only ask questions when you did most of the work yourself.

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Are you sure the username is correct on the server (!) before saving? How do you check if it is correct afterwards?

I also see you are comparing strings with ==. That does not work.

i started using datawatchers a bit here is the new updated code.

 

package Main.Pokey.Mine_EE_Mobs;

import java.util.Random;

import net.minecraft.block.Block;
import net.minecraft.client.Minecraft;
import net.minecraft.client.multiplayer.ServerData;
import net.minecraft.entity.Entity;
import net.minecraft.entity.EntityLiving;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.SharedMonsterAttributes;
import net.minecraft.entity.monster.IMob;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.potion.Potion;
import net.minecraft.potion.PotionEffect;
import net.minecraft.server.MinecraftServer;
import net.minecraft.server.management.ServerConfigurationManager;
import net.minecraft.util.DamageSource;
import net.minecraft.util.MathHelper;
import net.minecraft.world.World;
import net.minecraft.world.WorldType;
import net.minecraft.world.chunk.Chunk;

public class EntityEnderSlime extends EntityLiving implements IMob
{
public int Teleport = 1;
public int Head = 0;
public String username = "0gnrkhgnjhtngjhntngjhtngjthngjthngjhtngjhthnghjtngjhtnghj";
    public float squishAmount;
    public float squishFactor;
    public float prevSquishFactor;

    /** the time between each jump of the slime */
    private int slimeJumpDelay;
    private int TPin;

    public EntityEnderSlime(World par1World)
    {
        super(par1World);
        int i = 1 << this.rand.nextInt(3);
        this.yOffset = 0.0F;
        this.slimeJumpDelay = this.rand.nextInt(20) + 10;
        this.setSlimeSize(i);
        this.username = this.getUser();
    }

    protected void entityInit()
    {
        super.entityInit();
        this.dataWatcher.addObject(16, new Byte((byte)1));
        this.dataWatcher.addObject(14, String.valueOf(1));
    }

    protected void setSlimeSize(int par1)
    {
        this.dataWatcher.updateObject(16, new Byte((byte)par1));
        this.setSize(0.6F * (float)par1, 0.6f * (float)par1);
        this.setPosition(this.posX, this.posY, this.posZ);
        if(this.getSlimeSize() == 1){
            this.getEntityAttribute(SharedMonsterAttributes.maxHealth).setAttribute((5D));
            }
        if(this.getSlimeSize() > 1){
            this.getEntityAttribute(SharedMonsterAttributes.maxHealth).setAttribute((10D));
            }
        this.setHealth(this.getMaxHealth());
        this.experienceValue = par1;
    }

    /**
     * Returns the size of the slime.
     */
    public int getSlimeSize()
    {
        return this.dataWatcher.getWatchableObjectByte(16);
    }
    
    /**
     * Returns the size of the slime.
     */
    public String getUser()
    {
        return this.dataWatcher.getWatchableObjectString(14);
    	
    }

    public void setUser(String string)
    {
    	this.dataWatcher.updateObject(14, string);
    }


    /**
     * Returns the name of a particle effect that may be randomly created by EntitySlime.onUpdate()
     */
    protected String getSlimeParticle()
    {
        return "portal";
    }

    /**
     * Returns the name of the sound played when the slime jumps.
     */
    protected String getJumpSound()
    {
        return "";
    }

    /**
     * Called to update the entity's position/logic.
     */
    public void onUpdate()
    {   
    	super.onUpdate();
    	
    	if(username != null)
    	{
    		this.setSlimeSize(1);
    		if(this.Head != 0){
    			this.addPotionEffect(new PotionEffect(Potion.resistance.id,75, 99));
    			this.addPotionEffect(new PotionEffect(Potion.heal.id,75, 99));
    	}
    	}
    	
    	if(Head == 1 && this.username != null)
    	{
    		   //.getPlayerForUsername(username);
    		
    		//String P;
    		//Minecraft.getMinecraft().thePlayer;
    		this.head();
    		if(MinecraftServer.getServer().getConfigurationManager().getPlayerForUsername(username) != null){
             	this.setLocationAndAngles((double)MinecraftServer.getServer().getConfigurationManager().getPlayerForUsername(username).posX  + 0.0D, (double)MinecraftServer.getServer().getConfigurationManager().getPlayerForUsername(username).posY + 0.2D, (double)MinecraftServer.getServer().getConfigurationManager().getPlayerForUsername(username).posZ +  0.0D, 0.0F, 0.0F);
             	}
    	}
    	
    	Random TPXYZ = new Random();
    	TPin = TPXYZ.nextInt(3);
    	
    	this.fallDistance = 0;
    	if(Teleport > 3)
    	{
    		Teleport = 3;
    	}    	
    	
    	if(worldObj.isBlockOpaqueCube((int)posX, (int)posY, (int)posZ) == true && !this.isInWater() || worldObj.isBlockOpaqueCube((int)posX, (int)posY + 1, (int)posZ) == true && !this.isInWater())
    	{
    		this.addPotionEffect(new PotionEffect(Potion.resistance.id,75, 99));
        	if(!worldObj.isRemote){
            	this.setLocationAndAngles((double)posX  + 0.5D, (double)posY + 2.5D, (double)posZ +  0.5D, 0.0F, 0.0F);
            	this.Teleport();
            	}
    		
    		this.playSound("mob.endermen.portal", 1.0F, 1.0F);
    	}
    	
    	if(this.isInWater())
    	{
        	if(!worldObj.isRemote){
            	this.Teleport();
            	}
    	}
    	
        if (!this.worldObj.isRemote && this.worldObj.difficultySetting == 0 && this.getSlimeSize() > 0)
        {
            this.isDead = true;
        }

        this.squishFactor += (this.squishAmount - this.squishFactor) * 0.5F;
        this.prevSquishFactor = this.squishFactor;
        boolean flag = this.onGround;
        super.onUpdate();
        int i;

        if (this.onGround && !flag)
        {
            i = this.getSlimeSize();

            for (int j = 0; j < i * 8; ++j)
            {
                float f = this.rand.nextFloat() * (float)Math.PI * 2.0F;
                float f1 = this.rand.nextFloat() * 0.5F + 0.5F;
                float f2 = MathHelper.sin(f) * (float)i * 0.5F * f1;
                float f3 = MathHelper.cos(f) * (float)i * 0.5F * f1;
                this.worldObj.spawnParticle(this.getSlimeParticle(), this.posX + (double)f2, this.boundingBox.minY, this.posZ + (double)f3, 0.0D, 0.0D, 0.0D);
            }

            if (this.makesSoundOnLand())
            {
                this.playSound(this.getJumpSound(), this.getSoundVolume(), ((this.rand.nextFloat() - this.rand.nextFloat()) * 0.2F + 1.0F) / 0.8F);
            }

            this.squishAmount = -0.5F;
        }
        else if (!this.onGround && flag)
        {
            this.squishAmount = 1.0F;
        }

        this.alterSquishAmount();

        if (this.worldObj.isRemote)
        {
            i = this.getSlimeSize();
            this.setSize(0.6F * (float)i, 0.6F * (float)i);
        }        
    }

 private void head() {
	 if(!worldObj.isRemote){
	 this.motionX = 0;
	 this.motionY = 0;
	 this.motionZ = 0;
	 }

}

public boolean hitByEntity(Entity entity)
    {
	 if (entity instanceof EntityPlayer) {
		if(((EntityPlayer)entity).getCurrentEquippedItem() != null || ((EntityPlayer)entity).getCurrentEquippedItem() == null && ((EntityPlayer)entity).username != this.username)
	      {
	        if(Teleport >= 1 && this.getHealth() > 1)
	        {
	        	this.Teleport();
	        	return true;
	        }
	        else{
	        	 return false;
	        }

	         }
		}

	 else
	 {
        return true;
    }
return false;
    }
    
    private void Teleport() {
    	Random TP = new Random();
    	Random TP1 = new Random();
    	int TeleportX = TP.nextInt(10+1);
    	int TeleportZ = TP1.nextInt(10+1);
    	if(!worldObj.isRemote && TPin == 3){
        	this.setLocationAndAngles((double)posX + 0.5D, (double)posY + 0.5D, (double)posZ + TeleportZ +  0.5D, 0.0F, 0.0F);
        	}
    	else if(!worldObj.isRemote && TPin == 2){
        	this.setLocationAndAngles((double)posX + TeleportX + 0.5D, (double)posY + 0.5D, (double)posZ +  0.5D, 0.0F, 0.0F);
        	}
    	else if(!worldObj.isRemote && TPin == 1){
        	this.setLocationAndAngles((double)posX + 0.5D, (double)posY + 0.5D, (double)posZ - TeleportZ +  0.5D, 0.0F, 0.0F);
        	}
    	else if(!worldObj.isRemote && TPin == 0){
        	this.setLocationAndAngles((double)posX - TeleportX + 0.5D, (double)posY + 0.5D, (double)posZ +  0.5D, 0.0F, 0.0F);
        	}
        this.playSound("mob.endermen.portal", 1.0F, 1.0F);
    	Teleport--;

}
    
    
    public boolean attackEntityAsMob(Entity entity) {
	 super.attackEntityAsMob(entity);
	    	
	   Teleport++;
	return true;
	    	
	    	}


protected void updateEntityActionState()
    {
        this.despawnEntity();
        EntityPlayer entityplayer = this.worldObj.getClosestVulnerablePlayerToEntity(this, 16.0D);

        if (entityplayer != null)
        {
            this.faceEntity(entityplayer, 10.0F, 20.0F);
        }

        if (this.onGround && this.slimeJumpDelay-- <= 0)
        {
            this.slimeJumpDelay = this.getJumpDelay();

            if (entityplayer != null)
            {
                this.slimeJumpDelay /= 3;
            }

            this.isJumping = true;

            if (this.makesSoundOnJump())
            {
                this.playSound(this.getJumpSound(), this.getSoundVolume(), ((this.rand.nextFloat() - this.rand.nextFloat()) * 0.2F + 1.0F) * 0.8F);
            }

            this.moveStrafing = 1.0F - this.rand.nextFloat() * 2.0F;
            this.moveForward = (float)(1 * this.getSlimeSize());
        }
        else
        {
            this.isJumping = false;

            if (this.onGround)
            {
                this.moveStrafing = this.moveForward = 0.0F;
            }
        }
    }


 public boolean interact(EntityPlayer par1EntityPlayer)
    {
        ItemStack itemstack = par1EntityPlayer.inventory.getCurrentItem();

        if (itemstack != null && itemstack.itemID == Item.leash.itemID && !par1EntityPlayer.capabilities.isCreativeMode)
        {
        	username = par1EntityPlayer.username;
        	this.setUser(username);
            return true;
        }
        if (itemstack == null && !par1EntityPlayer.capabilities.isCreativeMode && this.Head == 1 && this.username == par1EntityPlayer.username)
        {
        	Head = 0;
            return true;
        }
        if (itemstack == null && !par1EntityPlayer.capabilities.isCreativeMode && this.Head == 0 && this.username == par1EntityPlayer.username)
        {
        	Head = 1;
            return true;
        }
        if (itemstack != null && itemstack.itemID == Item.flintAndSteel.itemID && !par1EntityPlayer.capabilities.isCreativeMode)
        {
        	Head = 0;
        	username = null;
            return true;
        }
        else
        {
            return super.interact(par1EntityPlayer);
        }
    }

    protected void alterSquishAmount()
    {
        this.squishAmount *= 0.6F;
    }

    /**
     * Gets the amount of time the slime needs to wait between jumps.
     */
    protected int getJumpDelay()
    {
        return this.rand.nextInt(15) + 10;
    }

    protected EntityEnderSlime createInstance()
    {
        return new EntityEnderSlime(this.worldObj);
    }

    /**
     * Will get destroyed next tick.
     */
    public void setDead()
    {
        int i = this.getSlimeSize();

        if (!this.worldObj.isRemote && i > 1 && this.getHealth() <= 0.0F)
        {
            int j = 2 + this.rand.nextInt(3);

            for (int k = 0; k < j; ++k)
            {
                float f = ((float)(k % 2) - 0.5F) * (float)i / 4.0F;
                float f1 = ((float)(k / 2) - 0.5F) * (float)i / 4.0F;
                EntityEnderSlime entityslime = this.createInstance();
                entityslime.setSlimeSize(i / 2);
                entityslime.setLocationAndAngles(this.posX + (double)f, this.posY + 0.5D, this.posZ + (double)f1, this.rand.nextFloat() * 360.0F, 0.0F);
                this.worldObj.spawnEntityInWorld(entityslime);
            }
        }

        super.setDead();
    }

    /**
     * Called by a player entity when they collide with an entity
     */
    public void onCollideWithPlayer(EntityPlayer par1EntityPlayer)
    {
    	
        if (this.canDamagePlayer())
        {
        	Teleport++;
            int i = this.getSlimeSize();

            if (par1EntityPlayer.username != this.username && this.canEntityBeSeen(par1EntityPlayer) && this.getDistanceSqToEntity(par1EntityPlayer) < 0.6D * (double)i * 0.6D * (double)i && par1EntityPlayer.attackEntityFrom(DamageSource.causeMobDamage(this), (float)this.getAttackStrength()))
            {
                this.playSound("mob.attack", 1.0F, (this.rand.nextFloat() - this.rand.nextFloat()) * 0.2F + 1.0F);
            }
        }
    }

    /**
     * Indicates weather the slime is able to damage the player (based upon the slime's size)
     */
    protected boolean canDamagePlayer()
    {
        return this.getSlimeSize() >= 1;
    }

    /**
     * Gets the amount of damage dealt to the player when "attacked" by the slime.
     */
    protected int getAttackStrength()
    {
        return this.getSlimeSize() +1;
    }

    /**
     * Returns the sound this mob makes when it is hurt.
     */
    protected String getHurtSound()
    {
        return "mob.slime." + (this.getSlimeSize() > 1 ? "big" : "small");
    }

    /**
     * Returns the sound this mob makes on death.
     */
    protected String getDeathSound()
    {
        return "mob.slime." + (this.getSlimeSize() > 1 ? "big" : "small");
    }

    /**
     * Returns the item ID for the item the mob drops on death.
     */
    protected int getDropItemId()
    {
        return this.getSlimeSize() == 1 ? Item.slimeBall.itemID : 0;
    }
    
    /**
     * Determines if an entity can be despawned, used on idle far away entities
     */
    protected boolean canDespawn()
    {
        if( this.username == null && this.ticksExisted > 2400)
        {
        	return false;
        }
	return true;
    }

    /**
     * Checks if the entity's current position is a valid location to spawn this entity.
     */
    public boolean getCanSpawnHere()
    {
        Chunk chunk = this.worldObj.getChunkFromBlockCoords(MathHelper.floor_double(this.posX), MathHelper.floor_double(this.posZ));

        if(worldObj.isDaytime())
        {
        	return false;
        }
        
        if(worldObj.provider.terrainType == WorldType.FLAT)
        {
        	return false;
        }
        else
        {
        	return true;
        }
    }
    
    /**
     * Returns the volume for the sounds this mob makes.
     */
    protected float getSoundVolume()
    {
        return 0.4F * (float)this.getSlimeSize();
    }

    /**
     * The speed it takes to move the entityliving's rotationPitch through the faceEntity method. This is only currently
     * use in wolves.
     */
    public int getVerticalFaceSpeed()
    {
        return 0;
    }

    /**
     * Returns true if the slime makes a sound when it jumps (based upon the slime's size)
     */
    protected boolean makesSoundOnJump()
    {
        return this.getSlimeSize() > 0;
    }

    /**
     * Returns true if the slime makes a sound when it lands after a jump (based upon the slime's size)
     */
    protected boolean makesSoundOnLand()
    {
        return this.getSlimeSize() > 2;
    }
    
    /**
     * (abstract) Protected helper method to write subclass entity data to NBT.
     */
    public void writeEntityToNBT(NBTTagCompound par1NBTTagCompound)
    {
        super.writeEntityToNBT(par1NBTTagCompound);
        par1NBTTagCompound.setInteger("Size", this.getSlimeSize() - 1);
        par1NBTTagCompound.setString("User", this.getUser());
       // par1NBTTagCompound.setInteger("TP", this.Teleport);
    }

    /**
     * (abstract) Protected helper method to read subclass entity data from NBT.
     */
    public void readEntityFromNBT(NBTTagCompound par1NBTTagCompound)
    {
        super.readEntityFromNBT(par1NBTTagCompound);
        this.setSlimeSize(par1NBTTagCompound.getInteger("Size") + 1);
        this.setUser(par1NBTTagCompound.getString("User"));
        //this.Teleport = par1NBTTagCompound.getInteger("TP");
    }

    
}

 

Its best to only ask questions when you did most of the work yourself.

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Okay so I updated everything so it only uses get and set username but it gives me a null-pointer exception and doesn't load the data.but saving seems to work.

 

package Main.Pokey.Mine_EE_Mobs;

import java.util.Random;

import net.minecraft.block.Block;
import net.minecraft.client.Minecraft;
import net.minecraft.client.multiplayer.ServerData;
import net.minecraft.entity.Entity;
import net.minecraft.entity.EntityLiving;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.SharedMonsterAttributes;
import net.minecraft.entity.monster.IMob;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.potion.Potion;
import net.minecraft.potion.PotionEffect;
import net.minecraft.server.MinecraftServer;
import net.minecraft.server.management.ServerConfigurationManager;
import net.minecraft.util.DamageSource;
import net.minecraft.util.MathHelper;
import net.minecraft.world.World;
import net.minecraft.world.WorldType;
import net.minecraft.world.chunk.Chunk;

public class EntityEnderSlime extends EntityLiving implements IMob
{
public int Teleport = 1;
public int Head = 0;
    public float squishAmount;
    public float squishFactor;
    public float prevSquishFactor;

    /** the time between each jump of the slime */
    private int slimeJumpDelay;
    private int TPin;

    public EntityEnderSlime(World par1World)
    {
        super(par1World);
        int i = 1 << this.rand.nextInt(3);
        this.yOffset = 0.0F;
        this.slimeJumpDelay = this.rand.nextInt(20) + 10;
        this.setSlimeSize(i);
        this.setUser(this.getUser());
    }

    protected void entityInit()
    {
        super.entityInit();
        this.dataWatcher.addObject(16, new Byte((byte)1));
        this.dataWatcher.addObject(14, String.valueOf(1));
    }

    protected void setSlimeSize(int par1)
    {
        this.dataWatcher.updateObject(16, new Byte((byte)par1));
        this.setSize(0.6F * (float)par1, 0.6f * (float)par1);
        this.setPosition(this.posX, this.posY, this.posZ);
        if(this.getSlimeSize() == 1){
            this.getEntityAttribute(SharedMonsterAttributes.maxHealth).setAttribute((5D));
            }
        if(this.getSlimeSize() > 1){
            this.getEntityAttribute(SharedMonsterAttributes.maxHealth).setAttribute((10D));
            }
        this.setHealth(this.getMaxHealth());
        this.experienceValue = par1;
    }

    /**
     * Returns the size of the slime.
     */
    public int getSlimeSize()
    {
        return this.dataWatcher.getWatchableObjectByte(16);
    }
    
    /**
     * Returns the size of the slime.
     */
    public String getUser()
    {
        return this.dataWatcher.getWatchableObjectString(14);
    	
    }

    public void setUser(String string)
    {
    	this.dataWatcher.updateObject(14, string);
    }


    /**
     * Returns the name of a particle effect that may be randomly created by EntitySlime.onUpdate()
     */
    protected String getSlimeParticle()
    {
        return "portal";
    }

    /**
     * Returns the name of the sound played when the slime jumps.
     */
    protected String getJumpSound()
    {
        return "";
    }

    /**
     * Called to update the entity's position/logic.
     */
    public void onUpdate()
    {   
    	super.onUpdate();
    	
    	if(this.getUser() != null)
    	{
    		this.setSlimeSize(1);
    		if(this.Head != 0){
    			this.addPotionEffect(new PotionEffect(Potion.resistance.id,75, 99));
    			this.addPotionEffect(new PotionEffect(Potion.heal.id,75, 99));
    	}
    	}
    	
    	if(Head == 1 && this.getUser() != null)
    	{
    		   //.getPlayerForUsername(username);
    		
    		//String P;
    		//Minecraft.getMinecraft().thePlayer;
    		this.head();
    		if(MinecraftServer.getServer().getConfigurationManager().getPlayerForUsername(this.getUser()) != null){
             	this.setLocationAndAngles((double)MinecraftServer.getServer().getConfigurationManager().getPlayerForUsername(this.getUser()).posX  + 0.0D, (double)MinecraftServer.getServer().getConfigurationManager().getPlayerForUsername(this.getUser()).posY + 0.2D, (double)MinecraftServer.getServer().getConfigurationManager().getPlayerForUsername(this.getUser()).posZ +  0.0D, 0.0F, 0.0F);
             	}
    	}
    	
    	Random TPXYZ = new Random();
    	TPin = TPXYZ.nextInt(3);
    	
    	this.fallDistance = 0;
    	if(Teleport > 3)
    	{
    		Teleport = 3;
    	}    	
    	
    	if(worldObj.isBlockOpaqueCube((int)posX, (int)posY, (int)posZ) == true && !this.isInWater() || worldObj.isBlockOpaqueCube((int)posX, (int)posY + 1, (int)posZ) == true && !this.isInWater())
    	{
    		this.addPotionEffect(new PotionEffect(Potion.resistance.id,75, 99));
        	if(!worldObj.isRemote){
            	this.setLocationAndAngles((double)posX  + 0.5D, (double)posY + 2.5D, (double)posZ +  0.5D, 0.0F, 0.0F);
            	this.Teleport();
            	}
    		
    		this.playSound("mob.endermen.portal", 1.0F, 1.0F);
    	}
    	
    	if(this.isInWater())
    	{
        	if(!worldObj.isRemote){
            	this.Teleport();
            	}
    	}
    	
        if (!this.worldObj.isRemote && this.worldObj.difficultySetting == 0 && this.getSlimeSize() > 0)
        {
            this.isDead = true;
        }

        this.squishFactor += (this.squishAmount - this.squishFactor) * 0.5F;
        this.prevSquishFactor = this.squishFactor;
        boolean flag = this.onGround;
        super.onUpdate();
        int i;

        if (this.onGround && !flag)
        {
            i = this.getSlimeSize();

            for (int j = 0; j < i * 8; ++j)
            {
                float f = this.rand.nextFloat() * (float)Math.PI * 2.0F;
                float f1 = this.rand.nextFloat() * 0.5F + 0.5F;
                float f2 = MathHelper.sin(f) * (float)i * 0.5F * f1;
                float f3 = MathHelper.cos(f) * (float)i * 0.5F * f1;
                this.worldObj.spawnParticle(this.getSlimeParticle(), this.posX + (double)f2, this.boundingBox.minY, this.posZ + (double)f3, 0.0D, 0.0D, 0.0D);
            }

            if (this.makesSoundOnLand())
            {
                this.playSound(this.getJumpSound(), this.getSoundVolume(), ((this.rand.nextFloat() - this.rand.nextFloat()) * 0.2F + 1.0F) / 0.8F);
            }

            this.squishAmount = -0.5F;
        }
        else if (!this.onGround && flag)
        {
            this.squishAmount = 1.0F;
        }

        this.alterSquishAmount();

        if (this.worldObj.isRemote)
        {
            i = this.getSlimeSize();
            this.setSize(0.6F * (float)i, 0.6F * (float)i);
        }        
    }

 private void head() {
	 if(!worldObj.isRemote){
	 this.motionX = 0;
	 this.motionY = 0;
	 this.motionZ = 0;
	 }

}

public boolean hitByEntity(Entity entity)
    {
	 if (entity instanceof EntityPlayer) {
		if(((EntityPlayer)entity).getCurrentEquippedItem() != null || ((EntityPlayer)entity).getCurrentEquippedItem() == null && ((EntityPlayer)entity).username != this.getUser())
	      {
	        if(Teleport >= 1 && this.getHealth() > 1)
	        {
	        	this.Teleport();
	        	return true;
	        }
	        else{
	        	 return false;
	        }

	         }
		}

	 else
	 {
        return true;
    }
return false;
    }
    
    private void Teleport() {
    	Random TP = new Random();
    	Random TP1 = new Random();
    	int TeleportX = TP.nextInt(10+1);
    	int TeleportZ = TP1.nextInt(10+1);
    	if(!worldObj.isRemote && TPin == 3){
        	this.setLocationAndAngles((double)posX + 0.5D, (double)posY + 0.5D, (double)posZ + TeleportZ +  0.5D, 0.0F, 0.0F);
        	}
    	else if(!worldObj.isRemote && TPin == 2){
        	this.setLocationAndAngles((double)posX + TeleportX + 0.5D, (double)posY + 0.5D, (double)posZ +  0.5D, 0.0F, 0.0F);
        	}
    	else if(!worldObj.isRemote && TPin == 1){
        	this.setLocationAndAngles((double)posX + 0.5D, (double)posY + 0.5D, (double)posZ - TeleportZ +  0.5D, 0.0F, 0.0F);
        	}
    	else if(!worldObj.isRemote && TPin == 0){
        	this.setLocationAndAngles((double)posX - TeleportX + 0.5D, (double)posY + 0.5D, (double)posZ +  0.5D, 0.0F, 0.0F);
        	}
        this.playSound("mob.endermen.portal", 1.0F, 1.0F);
    	Teleport--;

}
    
    
    public boolean attackEntityAsMob(Entity entity) {
	 super.attackEntityAsMob(entity);
	    	
	   Teleport++;
	return true;
	    	
	    	}


protected void updateEntityActionState()
    {
        this.despawnEntity();
        EntityPlayer entityplayer = this.worldObj.getClosestVulnerablePlayerToEntity(this, 16.0D);

        if (entityplayer != null)
        {
            this.faceEntity(entityplayer, 10.0F, 20.0F);
        }

        if (this.onGround && this.slimeJumpDelay-- <= 0)
        {
            this.slimeJumpDelay = this.getJumpDelay();

            if (entityplayer != null)
            {
                this.slimeJumpDelay /= 3;
            }

            this.isJumping = true;

            if (this.makesSoundOnJump())
            {
                this.playSound(this.getJumpSound(), this.getSoundVolume(), ((this.rand.nextFloat() - this.rand.nextFloat()) * 0.2F + 1.0F) * 0.8F);
            }

            this.moveStrafing = 1.0F - this.rand.nextFloat() * 2.0F;
            this.moveForward = (float)(1 * this.getSlimeSize());
        }
        else
        {
            this.isJumping = false;

            if (this.onGround)
            {
                this.moveStrafing = this.moveForward = 0.0F;
            }
        }
    }


 public boolean interact(EntityPlayer par1EntityPlayer)
    {
        ItemStack itemstack = par1EntityPlayer.inventory.getCurrentItem();

        if (itemstack != null && itemstack.itemID == Item.leash.itemID && !par1EntityPlayer.capabilities.isCreativeMode)
        {
        	this.setUser(par1EntityPlayer.username);
        	this.setUser(this.getUser());
            return true;
        }
        if (itemstack == null && !par1EntityPlayer.capabilities.isCreativeMode && this.Head == 1 && this.getUser() == par1EntityPlayer.username)
        {
        	Head = 0;
            return true;
        }
        if (itemstack == null && !par1EntityPlayer.capabilities.isCreativeMode && this.Head == 0 && this.getUser() == par1EntityPlayer.username)
        {
        	Head = 1;
            return true;
        }
        if (itemstack != null && itemstack.itemID == Item.flintAndSteel.itemID && !par1EntityPlayer.capabilities.isCreativeMode)
        {
        	Head = 0;
        	this.setUser(null);
            return true;
        }
        else
        {
            return super.interact(par1EntityPlayer);
        }
    }

    protected void alterSquishAmount()
    {
        this.squishAmount *= 0.6F;
    }

    /**
     * Gets the amount of time the slime needs to wait between jumps.
     */
    protected int getJumpDelay()
    {
        return this.rand.nextInt(15) + 10;
    }

    protected EntityEnderSlime createInstance()
    {
        return new EntityEnderSlime(this.worldObj);
    }

    /**
     * Will get destroyed next tick.
     */
    public void setDead()
    {
        int i = this.getSlimeSize();

        if (!this.worldObj.isRemote && i > 1 && this.getHealth() <= 0.0F)
        {
            int j = 2 + this.rand.nextInt(3);

            for (int k = 0; k < j; ++k)
            {
                float f = ((float)(k % 2) - 0.5F) * (float)i / 4.0F;
                float f1 = ((float)(k / 2) - 0.5F) * (float)i / 4.0F;
                EntityEnderSlime entityslime = this.createInstance();
                entityslime.setSlimeSize(i / 2);
                entityslime.setLocationAndAngles(this.posX + (double)f, this.posY + 0.5D, this.posZ + (double)f1, this.rand.nextFloat() * 360.0F, 0.0F);
                this.worldObj.spawnEntityInWorld(entityslime);
            }
        }

        super.setDead();
    }

    /**
     * Called by a player entity when they collide with an entity
     */
    public void onCollideWithPlayer(EntityPlayer par1EntityPlayer)
    {
    	
        if (this.canDamagePlayer())
        {
        	Teleport++;
            int i = this.getSlimeSize();

            if (par1EntityPlayer.username != this.getUser() && this.canEntityBeSeen(par1EntityPlayer) && this.getDistanceSqToEntity(par1EntityPlayer) < 0.6D * (double)i * 0.6D * (double)i && par1EntityPlayer.attackEntityFrom(DamageSource.causeMobDamage(this), (float)this.getAttackStrength()))
            {
                this.playSound("mob.attack", 1.0F, (this.rand.nextFloat() - this.rand.nextFloat()) * 0.2F + 1.0F);
            }
        }
    }

    /**
     * Indicates weather the slime is able to damage the player (based upon the slime's size)
     */
    protected boolean canDamagePlayer()
    {
        return this.getSlimeSize() >= 1;
    }

    /**
     * Gets the amount of damage dealt to the player when "attacked" by the slime.
     */
    protected int getAttackStrength()
    {
        return this.getSlimeSize() +1;
    }

    /**
     * Returns the sound this mob makes when it is hurt.
     */
    protected String getHurtSound()
    {
        return "mob.slime." + (this.getSlimeSize() > 1 ? "big" : "small");
    }

    /**
     * Returns the sound this mob makes on death.
     */
    protected String getDeathSound()
    {
        return "mob.slime." + (this.getSlimeSize() > 1 ? "big" : "small");
    }

    /**
     * Returns the item ID for the item the mob drops on death.
     */
    protected int getDropItemId()
    {
        return this.getSlimeSize() == 1 ? Item.slimeBall.itemID : 0;
    }
    
    /**
     * Determines if an entity can be despawned, used on idle far away entities
     */
    protected boolean canDespawn()
    {
        if( this.getUser() == null && this.ticksExisted > 2400)
        {
        	return false;
        }
	return true;
    }

    /**
     * Checks if the entity's current position is a valid location to spawn this entity.
     */
    public boolean getCanSpawnHere()
    {
        Chunk chunk = this.worldObj.getChunkFromBlockCoords(MathHelper.floor_double(this.posX), MathHelper.floor_double(this.posZ));

        if(worldObj.isDaytime())
        {
        	return false;
        }
        
        if(worldObj.provider.terrainType == WorldType.FLAT)
        {
        	return false;
        }
        else
        {
        	return true;
        }
    }
    
    /**
     * Returns the volume for the sounds this mob makes.
     */
    protected float getSoundVolume()
    {
        return 0.4F * (float)this.getSlimeSize();
    }

    /**
     * The speed it takes to move the entityliving's rotationPitch through the faceEntity method. This is only currently
     * use in wolves.
     */
    public int getVerticalFaceSpeed()
    {
        return 0;
    }

    /**
     * Returns true if the slime makes a sound when it jumps (based upon the slime's size)
     */
    protected boolean makesSoundOnJump()
    {
        return this.getSlimeSize() > 0;
    }

    /**
     * Returns true if the slime makes a sound when it lands after a jump (based upon the slime's size)
     */
    protected boolean makesSoundOnLand()
    {
        return this.getSlimeSize() > 2;
    }
    
    /**
     * (abstract) Protected helper method to write subclass entity data to NBT.
     */
    public void writeEntityToNBT(NBTTagCompound par1NBTTagCompound)
    {
        super.writeEntityToNBT(par1NBTTagCompound);
        par1NBTTagCompound.setInteger("Size", this.getSlimeSize() - 1);
        par1NBTTagCompound.setString("User", this.getUser());
       // par1NBTTagCompound.setInteger("TP", this.Teleport);
    }

    /**
     * (abstract) Protected helper method to read subclass entity data from NBT.
     */
    public void readEntityFromNBT(NBTTagCompound par1NBTTagCompound)
    {
        super.readEntityFromNBT(par1NBTTagCompound);
        this.setSlimeSize(par1NBTTagCompound.getInteger("Size") + 1);
        this.setUser(par1NBTTagCompound.getString("User"));
        //this.Teleport = par1NBTTagCompound.getInteger("TP");
    }

    
}

Its best to only ask questions when you did most of the work yourself.

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Show the stacktrace for the NPE.

So now I have a new problem it saves the player. so when i exit and reenter a world it still says it is tamed by the correct player. But if i try to do anything such as put it on my head or un tame it, it doesn't work

 

New Code

package Main.Pokey.Mine_EE_Mobs;

import java.util.Random;

import net.minecraft.block.Block;
import net.minecraft.client.Minecraft;
import net.minecraft.client.multiplayer.ServerData;
import net.minecraft.entity.Entity;
import net.minecraft.entity.EntityLiving;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.SharedMonsterAttributes;
import net.minecraft.entity.monster.IMob;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.potion.Potion;
import net.minecraft.potion.PotionEffect;
import net.minecraft.server.MinecraftServer;
import net.minecraft.server.management.ServerConfigurationManager;
import net.minecraft.util.DamageSource;
import net.minecraft.util.MathHelper;
import net.minecraft.world.World;
import net.minecraft.world.WorldType;
import net.minecraft.world.chunk.Chunk;

public class EntityEnderSlime extends EntityLiving implements IMob
{
public int Teleport = 1;
public int Head = 0;
    public float squishAmount;
    public float squishFactor;
    public float prevSquishFactor;

    /** the time between each jump of the slime */
    private int slimeJumpDelay;
    private int TPin;

    public EntityEnderSlime(World par1World)
    {
        super(par1World);
        int i = 1 << this.rand.nextInt(3);
        this.yOffset = 0.0F;
        this.slimeJumpDelay = this.rand.nextInt(20) + 10;
        this.setSlimeSize(i);
        if(this.getUser() != "null_TMMP")
        {
        	this.setUser(this.getUser());
        }

    }

    protected void entityInit()
    {
        super.entityInit();
        this.dataWatcher.addObject(16, new Byte((byte)1));
        this.dataWatcher.addObject(14, String.valueOf("null_TMMP"));
    }

    protected void setSlimeSize(int par1)
    {
        this.dataWatcher.updateObject(16, new Byte((byte)par1));
        this.setSize(0.6F * (float)par1, 0.6f * (float)par1);
        this.setPosition(this.posX, this.posY, this.posZ);
        if(this.getSlimeSize() == 1){
            this.getEntityAttribute(SharedMonsterAttributes.maxHealth).setAttribute((5D));
            }
        if(this.getSlimeSize() > 1){
            this.getEntityAttribute(SharedMonsterAttributes.maxHealth).setAttribute((10D));
            }
        this.setHealth(this.getMaxHealth());
        this.experienceValue = par1;
    }

    /**
     * Returns the size of the slime.
     */
    public int getSlimeSize()
    {
        return this.dataWatcher.getWatchableObjectByte(16);
    }
    
    /**
     * Returns the size of the slime.
     */
    public String getUser()
    {
        return this.dataWatcher.getWatchableObjectString(14);
    	
    }

    public void setUser(String string)
    {
    	this.dataWatcher.updateObject(14, string);
    }


    /**
     * Returns the name of a particle effect that may be randomly created by EntitySlime.onUpdate()
     */
    protected String getSlimeParticle()
    {
        return "portal";
    }

    /**
     * Returns the name of the sound played when the slime jumps.
     */
    protected String getJumpSound()
    {
        return "";
    }

    /**
     * Called to update the entity's position/logic.
     */
    public void onUpdate()
    {   
    	super.onUpdate();
    	
    	System.out.println(this.getUser());
    	
    	if(this.getUser() != "null_TMMP")
    	{
    		this.setSlimeSize(1);
    		this.setUser(this.getUser());
    		if(this.Head != 0){
    			this.addPotionEffect(new PotionEffect(Potion.resistance.id,75, 99));
    			this.addPotionEffect(new PotionEffect(Potion.heal.id,75, 99));
    	}
    	}
    	
    	if(Head == 1 && this.getUser() != "null_TMMP")
    	{
    		   //.getPlayerForUsername(username);
    		
    		//String P;
    		//Minecraft.getMinecraft().thePlayer;
    		this.head();
    		this.setUser(this.getUser());
    		if(MinecraftServer.getServer().getConfigurationManager().getPlayerForUsername(this.getUser()) != null){
             	this.setLocationAndAngles((double)MinecraftServer.getServer().getConfigurationManager().getPlayerForUsername(this.getUser()).posX  + 0.0D, (double)MinecraftServer.getServer().getConfigurationManager().getPlayerForUsername(this.getUser()).posY + 0.0D, (double)MinecraftServer.getServer().getConfigurationManager().getPlayerForUsername(this.getUser()).posZ +  0.0D, 0.0F, 0.0F);
             	}
    	}
    	
    	Random TPXYZ = new Random();
    	TPin = TPXYZ.nextInt(3);
    	
    	this.fallDistance = 0;
    	if(Teleport > 3)
    	{
    		Teleport = 3;
    	}    	
    	
    	if(worldObj.isBlockOpaqueCube((int)posX, (int)posY, (int)posZ) == true && !this.isInWater() || worldObj.isBlockOpaqueCube((int)posX, (int)posY + 1, (int)posZ) == true && !this.isInWater())
    	{
    		this.addPotionEffect(new PotionEffect(Potion.resistance.id,75, 99));
        	if(!worldObj.isRemote){
            	this.setLocationAndAngles((double)posX  + 0.5D, (double)posY + 2.5D, (double)posZ +  0.5D, 0.0F, 0.0F);
            	this.Teleport();
            	}
    		
    		this.playSound("mob.endermen.portal", 1.0F, 1.0F);
    	}
    	
    	if(this.isInWater())
    	{
        	if(!worldObj.isRemote){
            	this.Teleport();
            	}
    	}
    	
        if (!this.worldObj.isRemote && this.worldObj.difficultySetting == 0 && this.getSlimeSize() > 0)
        {
            this.isDead = true;
        }

        this.squishFactor += (this.squishAmount - this.squishFactor) * 0.5F;
        this.prevSquishFactor = this.squishFactor;
        boolean flag = this.onGround;
        super.onUpdate();
        int i;

        if (this.onGround && !flag)
        {
            i = this.getSlimeSize();

            for (int j = 0; j < i * 8; ++j)
            {
                float f = this.rand.nextFloat() * (float)Math.PI * 2.0F;
                float f1 = this.rand.nextFloat() * 0.5F + 0.5F;
                float f2 = MathHelper.sin(f) * (float)i * 0.5F * f1;
                float f3 = MathHelper.cos(f) * (float)i * 0.5F * f1;
                this.worldObj.spawnParticle(this.getSlimeParticle(), this.posX + (double)f2, this.boundingBox.minY, this.posZ + (double)f3, 0.0D, 0.0D, 0.0D);
            }

            if (this.makesSoundOnLand())
            {
                this.playSound(this.getJumpSound(), this.getSoundVolume(), ((this.rand.nextFloat() - this.rand.nextFloat()) * 0.2F + 1.0F) / 0.8F);
            }

            this.squishAmount = -0.5F;
        }
        else if (!this.onGround && flag)
        {
            this.squishAmount = 1.0F;
        }

        this.alterSquishAmount();

        if (this.worldObj.isRemote)
        {
            i = this.getSlimeSize();
            this.setSize(0.6F * (float)i, 0.6F * (float)i);
        }        
    }

 private void head() {

	 this.motionX = 0;
	 this.motionY = 0;
	 this.motionZ = 0;


}

public boolean hitByEntity(Entity entity)
    {
	 if (entity instanceof EntityPlayer) {
		if(((EntityPlayer)entity).getCurrentEquippedItem() != null || ((EntityPlayer)entity).getCurrentEquippedItem() == null && ((EntityPlayer)entity).username != this.getUser())
	      {
	        if(Teleport >= 1 && this.getHealth() > 1)
	        {
	        	this.Teleport();
	        	return true;
	        }
	        else{
	        	 return false;
	        }

	         }
		}

	 else
	 {
        return true;
    }
return false;
    }
    
    private void Teleport() {
    	Random TP = new Random();
    	Random TP1 = new Random();
    	int TeleportX = TP.nextInt(10+1);
    	int TeleportZ = TP1.nextInt(10+1);
    	if(!worldObj.isRemote && TPin == 3){
        	this.setLocationAndAngles((double)posX + 0.5D, (double)posY + 0.5D, (double)posZ + TeleportZ +  0.5D, 0.0F, 0.0F);
        	}
    	else if(!worldObj.isRemote && TPin == 2){
        	this.setLocationAndAngles((double)posX + TeleportX + 0.5D, (double)posY + 0.5D, (double)posZ +  0.5D, 0.0F, 0.0F);
        	}
    	else if(!worldObj.isRemote && TPin == 1){
        	this.setLocationAndAngles((double)posX + 0.5D, (double)posY + 0.5D, (double)posZ - TeleportZ +  0.5D, 0.0F, 0.0F);
        	}
    	else if(!worldObj.isRemote && TPin == 0){
        	this.setLocationAndAngles((double)posX - TeleportX + 0.5D, (double)posY + 0.5D, (double)posZ +  0.5D, 0.0F, 0.0F);
        	}
        this.playSound("mob.endermen.portal", 1.0F, 1.0F);
    	Teleport--;

}
    
    
    public boolean attackEntityAsMob(Entity entity) {
	 super.attackEntityAsMob(entity);
	    	
	   Teleport++;
	return true;
	    	
	    	}


protected void updateEntityActionState()
    {
        this.despawnEntity();
        EntityPlayer entityplayer = this.worldObj.getClosestVulnerablePlayerToEntity(this, 16.0D);

        if (entityplayer != null)
        {
            this.faceEntity(entityplayer, 10.0F, 20.0F);
        }

        if (this.onGround && this.slimeJumpDelay-- <= 0)
        {
            this.slimeJumpDelay = this.getJumpDelay();

            if (entityplayer != null)
            {
                this.slimeJumpDelay /= 3;
            }

            this.isJumping = true;

            if (this.makesSoundOnJump())
            {
                this.playSound(this.getJumpSound(), this.getSoundVolume(), ((this.rand.nextFloat() - this.rand.nextFloat()) * 0.2F + 1.0F) * 0.8F);
            }

            this.moveStrafing = 1.0F - this.rand.nextFloat() * 2.0F;
            this.moveForward = (float)(1 * this.getSlimeSize());
        }
        else
        {
            this.isJumping = false;

            if (this.onGround)
            {
                this.moveStrafing = this.moveForward = 0.0F;
            }
        }
    }


 public boolean interact(EntityPlayer par1EntityPlayer)
    {
        ItemStack itemstack = par1EntityPlayer.inventory.getCurrentItem();

        if (itemstack != null && itemstack.itemID == Item.leash.itemID && !par1EntityPlayer.capabilities.isCreativeMode && this.getUser() == "null_TMMP")
        {
        	this.setUser(par1EntityPlayer.username);
    		this.setCustomNameTag(this.getUser() + "'s Ender Slime");
            return true;
        }
        if (itemstack != null && itemstack.itemID == Item.saddle.itemID && !par1EntityPlayer.capabilities.isCreativeMode && this.Head == 1 && this.getUser() == par1EntityPlayer.username)
        {
        	Head = 0;
            return true;
        }
        else if (itemstack != null && itemstack.itemID == Item.saddle.itemID && !par1EntityPlayer.capabilities.isCreativeMode && this.Head == 0 && this.getUser() == par1EntityPlayer.username)
        {
        	Head = 1;
            return true;
        }
        if (itemstack != null && itemstack.itemID == Item.flintAndSteel.itemID && !par1EntityPlayer.capabilities.isCreativeMode && this.getUser() == par1EntityPlayer.username)
        {
        	Head = 0;
        	this.setUser("null_TMMP");
            return true;
        }
        if (itemstack != null && itemstack.itemID == Item.nameTag.itemID && !par1EntityPlayer.capabilities.isCreativeMode)
        {
        	Head = 0;
        	par1EntityPlayer.addChatMessage("Owner:" + this.getUser());
            return true;
        }
        else
        {
            return super.interact(par1EntityPlayer);
        }
    }

    protected void alterSquishAmount()
    {
        this.squishAmount *= 0.6F;
    }

    /**
     * Gets the amount of time the slime needs to wait between jumps.
     */
    protected int getJumpDelay()
    {
        return this.rand.nextInt(15) + 10;
    }

    protected EntityEnderSlime createInstance()
    {
        return new EntityEnderSlime(this.worldObj);
    }

    /**
     * Will get destroyed next tick.
     */
    public void setDead()
    {
        int i = this.getSlimeSize();

        if (!this.worldObj.isRemote && i > 1 && this.getHealth() <= 0.0F)
        {
            int j = 2 + this.rand.nextInt(3);

            for (int k = 0; k < j; ++k)
            {
                float f = ((float)(k % 2) - 0.5F) * (float)i / 4.0F;
                float f1 = ((float)(k / 2) - 0.5F) * (float)i / 4.0F;
                EntityEnderSlime entityslime = this.createInstance();
                entityslime.setSlimeSize(i / 2);
                entityslime.setLocationAndAngles(this.posX + (double)f, this.posY + 0.5D, this.posZ + (double)f1, this.rand.nextFloat() * 360.0F, 0.0F);
                this.worldObj.spawnEntityInWorld(entityslime);
            }
        }

        super.setDead();
    }

    /**
     * Called by a player entity when they collide with an entity
     */
    public void onCollideWithPlayer(EntityPlayer par1EntityPlayer)
    {
    	
        if (this.canDamagePlayer())
        {
        	Teleport++;
            int i = this.getSlimeSize();

            if (par1EntityPlayer.username != this.getUser() && this.canEntityBeSeen(par1EntityPlayer) && this.getDistanceSqToEntity(par1EntityPlayer) < 0.6D * (double)i * 0.6D * (double)i && par1EntityPlayer.attackEntityFrom(DamageSource.causeMobDamage(this), (float)this.getAttackStrength()))
            {
                this.playSound("mob.attack", 1.0F, (this.rand.nextFloat() - this.rand.nextFloat()) * 0.2F + 1.0F);
            }
        }
    }

    /**
     * Indicates weather the slime is able to damage the player (based upon the slime's size)
     */
    protected boolean canDamagePlayer()
    {
        return this.getSlimeSize() >= 1;
    }

    /**
     * Gets the amount of damage dealt to the player when "attacked" by the slime.
     */
    protected int getAttackStrength()
    {
        return this.getSlimeSize() +1;
    }

    /**
     * Returns the sound this mob makes when it is hurt.
     */
    protected String getHurtSound()
    {
        return "mob.slime." + (this.getSlimeSize() > 1 ? "big" : "small");
    }

    /**
     * Returns the sound this mob makes on death.
     */
    protected String getDeathSound()
    {
        return "mob.slime." + (this.getSlimeSize() > 1 ? "big" : "small");
    }

    /**
     * Returns the item ID for the item the mob drops on death.
     */
    protected int getDropItemId()
    {
        return this.getSlimeSize() == 1 ? Item.slimeBall.itemID : 0;
    }
    
    /**
     * Determines if an entity can be despawned, used on idle far away entities
     */
    protected boolean canDespawn()
    {
        if( this.getUser() == "null_TMMP" && this.ticksExisted > 2400)
        {
        	return false;
        }
        else{
	return true;
    }
    }

    /**
     * Checks if the entity's current position is a valid location to spawn this entity.
     */
    public boolean getCanSpawnHere()
    {
        Chunk chunk = this.worldObj.getChunkFromBlockCoords(MathHelper.floor_double(this.posX), MathHelper.floor_double(this.posZ));

        if(worldObj.isDaytime())
        {
        	return false;
        }
        
        if(worldObj.provider.terrainType == WorldType.FLAT)
        {
        	return false;
        }
        else
        {
        	return true;
        }
    }
    
    /**
     * Returns the volume for the sounds this mob makes.
     */
    protected float getSoundVolume()
    {
        return 0.4F * (float)this.getSlimeSize();
    }

    /**
     * The speed it takes to move the entityliving's rotationPitch through the faceEntity method. This is only currently
     * use in wolves.
     */
    public int getVerticalFaceSpeed()
    {
        return 0;
    }

    /**
     * Returns true if the slime makes a sound when it jumps (based upon the slime's size)
     */
    protected boolean makesSoundOnJump()
    {
        return this.getSlimeSize() > 0;
    }

    /**
     * Returns true if the slime makes a sound when it lands after a jump (based upon the slime's size)
     */
    protected boolean makesSoundOnLand()
    {
        return this.getSlimeSize() > 2;
    }
    
    /**
     * (abstract) Protected helper method to write subclass entity data to NBT.
     */
    public void writeEntityToNBT(NBTTagCompound par1NBTTagCompound)
    {
        super.writeEntityToNBT(par1NBTTagCompound);
        par1NBTTagCompound.setInteger("Size", this.getSlimeSize() - 1);
        par1NBTTagCompound.setString("User", this.getUser());
       // par1NBTTagCompound.setInteger("TP", this.Teleport);
    }

    /**
     * (abstract) Protected helper method to read subclass entity data from NBT.
     */
    public void readEntityFromNBT(NBTTagCompound par1NBTTagCompound)
    {
        super.readEntityFromNBT(par1NBTTagCompound);
        this.setSlimeSize(par1NBTTagCompound.getInteger("Size") + 1);
        this.setUser(par1NBTTagCompound.getString("User"));
        //this.Teleport = par1NBTTagCompound.getInteger("TP");
    }

    
}

Its best to only ask questions when you did most of the work yourself.

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