The title says it all. When I make a tile entity, the coordinates are 0 and the worldObj is null. I've figured out how to initialise the tile entity with the coordinates and save it in NBT tags when I save the world, but unfortunately I can't save the world object in NBT tags. So how do I let tile entities access the world object?

Thanks for your reply. Yes, I was doing it wrong, and I've got it working now.