Java Edition Classic 0.0.12a

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 "title": "0.0.12a",
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 "field": "''(link to Java Edition article, displayed as Java Edition)''",
 "label": "(link to Edition article, displayed as Edition)"
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 {
 "field": "May 19, 2009",
 "label": "Release date"
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 "field": "<span class=\"plainlinks\">[https://en.wikipedia.org/wiki/Java_version_history#Java_SE_5 Java SE 5]</span>",
 "label": "<span style=\"white-space: normal;\">Minimum Java version</span>"
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 {
 "field": "mojang.com/notch/minecraft/",
 "label": "(link to Applet#Hosting article, displayed as Applet page)"
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 "field": "Unknown(link to Category:Unknown al_version article, displayed as Category:Unknown al_version)",
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 "invimages": [],
 "footer": "<table style=\"margin: auto; word-break: break-word;\">\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\" rowspan=\"2\">[[Java Edition Classic 0.0.11a|<span style=\"margin-right:-0.35em\">◄</span>◄  0.0.11a]]</td>\n<td rowspan=\"2\" style=\"padding: 0.4em\">'''0.0.12a'''</td>\n<td style=\"padding: 0.4em\" >[[Java Edition Classic 0.0.13a| 0.0.13a <span style=\"margin-right:-0.35em\">►</span>►]]</td>\n</tr>\n<tr style=\"background: inherit;\">\n\n\n<td style=\"padding: 0.4em\">\n[[Java Edition Classic 0.0.12a_01| 0.0.12a_01 ►]]\n</td>\n</tr>\n</table>"
}

0.0.12a^[1] is a version of Java Edition Classic released on May 19, 2009, at 22:36 UTC,^{[2][note 1]} which adds bedrock, water and lava, along with a world boundary and a new world generator.

👁 Image
Bedrock

• Unobtainable to the player.
• Bedrock and the layer above (if at the bottom of the world) is always dark even if exposed to the sky.
• Generates at the bottom of the world and in world boundary.
• Can't be broken, placed against, or otherwise selected.
• Also called “unbreakable stone”.

👁 Image
Lava

• A type of liquid.
• Is transparent.
• Underneath lava, the mist is thin and orange in color.
• Spreads infinitely.
• Saplings decay if placed in lava
• Lava spreads by duplicating itself to open horizontal and downward squares.
• Lava is slower than water and can be easily outrun.
• Model has z-fighting with blocks below lava.

👁 Image
Water

• A type of liquid.
• Is transparent.
• Spreads infinitely.
• Doesn't work outside the map (it doesn't spread from world border after terrain generation).^[3]
• Saplings decay if placed in water.
• Water spreads by duplicating itself to open horizontal and downward squares.

Controls

• Pressing cycles between four levels of render distance which was known as "Fog setting".^[4]
• Pressing generates a new level, with a new level generation screen.^[4]

Swimming

• Only applies to players.
• Mobs move at full speed in the water.

Stone

• Water next to lava produces stone.

Mobs

• No longer get reset on level reset, meaning there is no way to get rid of mobs now.^[5]

Player

• Player jump height increased by about 0.5 blocks.^[6]

General

• An infinite ocean now surrounds the map, making it impossible to fall off the world.
• The player can no longer pass the edge of the map.
• Terrain is messier with more bumps visible on the surface. It also now generates in islands.
  • The terrain always generates one block above ocean level.
  • Lakes occur when the surrounding water is at a higher level than the terrain.
  • All dirt with access to sunlight doesn't become grass blocks upon world generation if below water level.
• Lava lakes also spawn occasionally.
• Worlds made before this version receive a bedrock layer at the bottom of the map and an ocean surrounding it.

1 bug reported

• The block being used to build does not show up unless it is a sapling.^[7]

• 👁 Early version of water during the development of this version.
  
  Early version of water during the development of this version.
• 👁 Developer version of 0.0.12a, where multiplayer began work on the implementation. The version number is still 0.0.11a.
  
  Developer version of 0.0.12a, where multiplayer began work on the implementation. The version number is still 0.0.11a.

• The video released by Notch on May 18th showing off 0.0.12a is actually a developer variant that was never released to the public. See Development for more information on this.
• To make the water and lava texture display slightly shorter than a block, its texture from terrain.png gets shifted down a bit in-game. This causes the texture to overlap with the block below at some angles.
• The 0.0.13a-launcher jar contains the level generation files for this same version, which is also the same terrain generation files used in the full, public release of it (and 0.0.12a_01-03). It has variables that can enable and disable the uniform dirt layer, and it has been disabled for the public variant of 0.0.12a (or at least 0.0.12a_03 for certain). It also has variables for the water filling up the world from the corners, which can be disabled.