What items can be farmed fully automatically?

Question

Cacti have always been farmable completely automatically. With pistons in 1.7, sugar cane can now be farmed in a fully automatic fashion as well. Mobs and animals can be farmed as well in giant mob grinders. To my knowledge these are the only items that can be farmed in a fully automatic fashion in vanilla Minecraft.

Cobblestone can be farmed fully automatically using mods, or in a semi-automatic fashion using TNT. Wheat can be farmed semi-automatically on a massive scale, but unfortunately requires replanting and tilling.

What I'd like to know is if there are any contraptions people have contrived to harvest any other item in a fully automatic way without using any mods.

Answer

Aside from the things you mentioned:

• Records can be farmed (semi-automatically), with this ingenious contraption.
• Cooked Food - raw food is easily collected with vanilla mobtraps, this trap cooks the meat too! This one uses pig spawners, but just modify your vanilla trap to kill with this method to harvest cooked instead of raw meat from all mobs.
• Melons & Pumpkins can be farmed in a similar fashion to wheat, in that the ground needs to be re-tilled.
• Mushrooms are easily farmed, since they spread by themselves.
• Eggs can be farmed, but you'll need to repopulate your trap if/when the mobs despawn.

I'll continue to think about this, let me know if there's anything to be added.

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