Java Edition 12w40a

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12w40a is the tenth snapshot for Java Edition 1.4.2, released on October 4, 2012.^[1]

Swamp huts

• New generated structure.
• Located in swamp biomes.
• Spawn witches.

NBT format

• Custom items can now be named using NBT data (intended for custom map makers).
  • Using the NBT, it is possible to add custom [String] Name to items, as well as a [NBT List / JSON Array] Lore list for that item.

Superflat

• Added preset "Redstone Ready" with 52 layers of sandstone, 3 layers of stone and 1 layer of bedrock.

Beacons

• Texture has been altered.
• Beam texture has also been changed.

Fire

• Spreading has been nerfed to prevent infinitely spreading fires.

Eye of ender

• Can now be used in superflat worlds, if the stronghold generation is enabled.

Slimes

• Now spawn in swamp biomes at low light level.

Inventory

• Better management.
• The pick block action now works on blocks that are represented as items in the inventory (e.g.: redstone repeater, redstone dust, and tripwire).
• Pressing the 1-9 hotkeys while hovering over an item puts that item into the corresponding hotbar slot.
  • If there is already an item in the assigned hotbar slot, the hotbar item and the selected item swap position.
  • When in Creative inventory, a full stack of that item is transferred to that hotbar slot.
• In Creative mode, players can now shift-click items between the hotbar and the Survival inventory.
• The left-click action no longer opens doors, pulls levers, pushes buttons or opens trapdoors.
• When in Creative mode, pick block on an item picks up a stack of that item.

Superflat

• Configuration now allows the player to generate trees, strongholds etc.
• Now pumpkins, short grass, ferns, flowers, trees, mineshafts, dungeons, strongholds, lakes, desert wells, ravines and ores spawn on superflat maps.

13 bugs fixed

• Fixed the wither's starting explosion not being disabled by the mobGriefing gamerule^[2]
• Fixed a few crash bugs related to world generation, map item expansion, and other things.
• Reverted lighting changes that had been introduced in snapshot 12w39a. This change corrected such bugs as:
  • The Nether being extremely CPU intensive.
  • Map generation taking extremely long.
• Fixed mob AI considering cobblestone walls as blocks of normal height.
• Fixed a few texture oddities with the witch.
• Fixed entities in water producing glitchy water sound.
• Gaining multiple levels at a time no longer plays the leveling up sound over itself as many times as leveled.
• Fixed the "A 64 bit Java installation is recommended for 'Far' render distance (you have 32 bit)" message being covered by the bottom 2 buttons.
• Fixed pets teleporting around randomly.^[3]
• Fixed being unable to place paintings larger than 1x2 and them popping off if they have been placed before.
• Fixed destroying blocks under the player with efficiency-enchanted gear.
• Fixed potion spawners crashing the game.^[4]