TileEntity inventory without using IInventory?

ok cool I got it to work. I changed my code to:

package com.example.gammacraft.TileEntity;

import net.minecraft.entity.item.EntityItem;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.network.NetworkManager;
import net.minecraft.network.Packet;
import net.minecraft.network.play.server.S35PacketUpdateTileEntity;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.world.World;

public class MultiToolModifierTileEntity extends TileEntity {

public ItemStack[] inv;

public MultiToolModifierTileEntity() {
	inv=new ItemStack[10];
}

public Packet getDescriptionPacket() {
        NBTTagCompound nbtTag = new NBTTagCompound();
        this.writeToNBT(nbtTag);
        return new S35PacketUpdateTileEntity(this.xCoord, this.yCoord, this.zCoord, 1, nbtTag);
}

public void onDataPacket(NetworkManager net, S35PacketUpdateTileEntity packet) {
        readFromNBT(packet.func_148857_g());
}

public void writeToNBT(NBTTagCompound nbt){
	super.writeToNBT(nbt);

	for(int i =0;i!=inv.length;i++){
		NBTTagCompound NBT = new NBTTagCompound();
		if(inv[i]!=null){
		inv[i].writeToNBT(NBT);
		nbt.setTag("ItemStack"+i,NBT);
		}
		System.out.println("saving:"+i);
	}

	this.markDirty();
}

public void readFromNBT(NBTTagCompound nbt){
	super.readFromNBT(nbt);

	for(int i =0;i!=inv.length;i++){
		NBTTagCompound itemstack = nbt.getCompoundTag("ItemStack"+i);

		try{
		inv[i]=ItemStack.loadItemStackFromNBT(itemstack);
		}catch(Exception e){
			e.printStackTrace();
		}

		System.out.println("reading:"+i);

	}

}

}