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Java Edition 12w42a

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Minecraft 12w42a
12w42a Banner.png

Java Edition



Release date

October 17, 2012

Snapshot for



Client (.json)
Server (.exe)

Protocol version


12w42a is the fourteenth snapshot released for Java Edition 1.4.2.[1]



  • New crafting recipe, now is 31 iron ingots instead of 55.
  • Minor visual changes.
  • The player can repair tools and armor using their source material.
    • To get a tool or piece of armor to its maximum durability when it is nearly broken, one must use four of its source material (planks, cobblestone, iron, gold or diamonds).
    • However, hoes are not able to be repaired.
  • Reduced experience level cost.
Redstone Repeaters
  • When powering either side of a repeater directly with another repeater, it will lock the current state of the other repeater until the signal to the powering repeater is turned off.
    • If a repeater that is on is locked, it will stay on.
    • If a repeater that is off is locked, it cannot output a signal.
  • When locked, the repeater's second torch will no longer be visible and a bar textured similarly to bedrock will appear.




  • Updated language file.
  • IPs can now be individually hidden


9 bugs fixed

  • Fixed very damaged anvils dropping from at least 6 blocks becoming a glitched entity that cannot be removed until the map is reloaded.
  • Fixed digging straight down glitching the player into blocks again.
  • Fixed PvP-disabled servers still allowing players to set other players on fire using Fire Aspect enchanted swords.
  • Fixed dropping from low heights doing damage on certain occasions.
  • Fixed dropping an anvil on an end crystal crashing the game.
  • Fixed the game sometimes crashing when using F3+H to show durability on items and then moving the mouse over a non-blank map.
  • Fixed the game crashing when maximizing the game while in the anvil UI.
  • Fixed a stack overflow error when dispensers attempted to place water or lava into a solid block.
  • Fixed the crafting table and cauldron that spawn in Swamp Huts spawning at the top of the hut.