My entity (not entity living ) keeps teleporting when anything touches it. It teleports up about 10 blocks (the actual entity does, not just the model). When I try to go under it, I can't. I seems to have an invisible barrier beneath it, and whenever I touch that barrier, the screen shakes and I get stuck in the barrier. This is not the bounding box, because the bounding box is where the entity is (using F3+B). After a little while, the entity will come back down. Then it starts all over again.

 

code:

 

package com.apmods.creeps.entity;

import net.minecraft.entity.Entity;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.util.AxisAlignedBB;
import net.minecraft.world.World;

public class EntitySlotMachine extends Entity{

public EntitySlotMachine(World worldIn) {
	super(worldIn);
	this.setSize(2, 3);
}

@Override
protected void entityInit() {
	this.dataWatcher.addObject(14, new Integer(0));
	this.dataWatcher.addObject(15, new Integer(0));
	this.dataWatcher.addObject(16, new Integer(0));
}

@Override
protected void readEntityFromNBT(NBTTagCompound tagCompund) {
	this.setSlot(0, tagCompund.getInteger("slot1"));
	this.setSlot(1, tagCompund.getInteger("slot2"));
	this.setSlot(2, tagCompund.getInteger("slot3"));

}

@Override
protected void writeEntityToNBT(NBTTagCompound tagCompound) {
	tagCompound.setInteger("slot1", this.getSlot(0));
	tagCompound.setInteger("slot2", this.getSlot(1));
	tagCompound.setInteger("slot3", this.getSlot(2));
}

public void setSlot(int slot, int state){
	this.dataWatcher.updateObject(14 + slot, state);
}

public int getSlot(int slot){
	return this.dataWatcher.getWatchableObjectInt(14 + slot);
}

@Override
public void onUpdate() {
	// TODO Auto-generated method stub
	super.onUpdate();
	this.prevPosX = posX;
	this.prevPosY = posY;
	this.prevPosZ = posZ;
	if(!this.onGround){
		this.moveEntity(0, -0.5, 0);
	}
}

@Override
public boolean interactFirst(EntityPlayer playerIn) {

	if (this.riddenByEntity != null && this.riddenByEntity instanceof EntityPlayer && this.riddenByEntity != playerIn)
        {
            return true;
        }
        else
        {
            if (!this.worldObj.isRemote)
            {
                playerIn.mountEntity(this);
            }

            return true;
        }
}

@Override
public AxisAlignedBB getBoundingBox() {
	// TODO Auto-generated method stub
	return this.getEntityBoundingBox();
}

@Override
public AxisAlignedBB getCollisionBox(Entity entityIn) {
	// TODO Auto-generated method stub
	return this.getEntityBoundingBox();
}

@Override
public boolean canBeCollidedWith() {
	// TODO Auto-generated method stub
	return !this.isDead;
}

@Override
public boolean canBePushed() {
	// TODO Auto-generated method stub
	return !this.isDead;
}

@Override
public double getMountedYOffset() {
	// TODO Auto-generated method stub
	return this.height * 0.4;
}

}

 

You need to call super for entityInit and the read/write NBT methods. Perhaps that will fix your issue, perhaps not, but it certainly is a problem not doing so.

I agree with coolAlias, many problems I've encountered with entities have stemmed from not calling the supers in each method I override. 

 

If that doesn't work, try slowly removing each method you override to see which one is causing the issue.

The problematic method is Entity.func_180426_a(), which is called whenever the entity receives a position packet from the server.

 

By default that method moves entities up if they're colliding with something, just override the method so it doesnt do that.