I created a custom vehicle entity that can be loaded from a simple txt file. Now i want that entities are saved through world saving. So i added an ID to my vehicleFIle(file comes in the entities construuctor to define it) and save this entity in onEntityWriteToNBT. Somehow the value is not there when the entity respawns. This is my saving code:

 

@Override
public void readEntityFromNBT(NBTTagCompound tagCompund) {
	NBTTagCompound vehicletag = tagCompund.getCompoundTag("VehicleTag");
	this.fuellevel = vehicletag.getDouble("Fuel");
	if (file == null)
		if (Vehicles.getFromId(vehicletag.getInteger("FileID")) != null) {
			this.file = Vehicles.getFromId(vehicletag.getInteger("FileID"));
		}

}

@Override
public void writeEntityToNBT(NBTTagCompound tagCompund) {
	NBTTagCompound tag = new NBTTagCompound();
	tag.setDouble("Fuel", this.fuellevel);
	tagCompund.setInteger("FileID", file.getID());
	tagCompund.setTag("VehicleTag", tag);
}

1. Moar code.

 

Might be handy:

"new" Entity is created once - by spawner. When entity is "new" NBT is NOT being read.

Loaded entities on the other hand are being created using reflection (.newInstance()) and then filled with data from NBT.

 

Following that - you can/should inject yourself into MyEntity(World) constructor that will ALWAYS (no matter if loaded or created) will set default values for your vehicle. Then if it happend that entity was loaded from world - use your readNBT method to replace file field.

 

Idk whole code so might be missing design.