Java Edition 12w18a

{
 "title": "Minecraft 12w18a",
 "images": [
 "Java Edition 12w18a.png"
 ],
 "rows": [
 {
 "field": "''(link to Java Edition article, displayed as Java Edition)''",
 "label": "(link to Edition article, displayed as Edition)"
 },
 {
 "field": "May 3, 2012",
 "label": "Release date"
 },
 {
 "field": "(link to Snapshot article, displayed as Snapshot)",
 "label": "(link to Version types article, displayed as Type)"
 },
 {
 "field": "(link to Java Edition 1.3.1 article, displayed as 1.3.1)",
 "label": "Snapshot for"
 },
 {
 "field": "[https://vault.omniarchive.uk/archive/java/client-release/1.3/pre/12w18a.jar Client] ([https://meta.celestia.sh/versions/v1/12w18a.json .json]) <br />[https://vault.omniarchive.uk/archive/java/server-release/1.3/pre/12w18a.jar Server] ([https://vault.omniarchive.uk/archive/java/server-release/1.3/pre/12w18a.exe .exe])",
 "label": "(link to Tutorial:Installing a version#Manual version installation article, displayed as Downloads)"
 },
 {
 "field": "32",
 "label": "(link to Protocol version article, displayed as Protocol version)"
 },
 {
 "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>"
 }
 ],
 "invimages": [],
 "footer": "<table style=\"margin: auto; word-break: break-word;\">\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\" >[[Java Edition 1.2.5|<span style=\"margin-right:-0.35em\">◄</span>◄  1.2.5]]</td>\n<td style=\"padding: 0.4em\">'''[[Java Edition 1.3.1|1.3.1]]'''</td>\n<td style=\"padding: 0.4em\" >[[Java Edition 1.3.2| 1.3.2 <span style=\"margin-right:-0.35em\">►</span>►]]</td>\n</tr>\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\">\n[[Java Edition 12w17a|◄  12w17a]]\n</td>\n<td style=\"padding: 0.4em\">''' 12w18a'''</td>\n<td style=\"padding: 0.4em\">\n[[Java Edition 12w19a| 12w19a ►]]\n</td>\n</tr>\n</table>"
}

12w18a is the fourth snapshot for Java Edition 1.3.1, released on May 3, 2012.^[1]

This is the first version that makes singleplayer worlds run on a local server, resulting in the use of separate threads for rendering logic and world logic. This change resulted in a large number of broken features, some of which are yet to be fixed in the latest version, and on weak computers can result in server-lag in singleplayer.

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Wood, Leaves, Planks, and Stone Bricks Variants

• Now have their proper names (e.g. "Oak Wood", "Birch Leaves", "Spruce Wood Planks", "Mossy Stone Bricks").

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Book and Quills

• Game no longer pauses when writing in a book and quill.

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Cocoa Beans

• Now obtainable from jungle tree leaves.

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Signs

• Game no longer pauses when writing in a sign.

Wooden Tools

• Can now smelt one item in a furnace.

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Villagers

• When spawned from spawn eggs, they now get a random profession.

Breaking

• The 1⁄4 second (5 tick) delay between block breaking has been removed for players in Survival. The player can now instantly mine a large amount of blocks in Survival simply by holding destroy if conditions are met.

Hardcore

• Hardcore is now available in multiplayer.

Singleplayer

• Separated server logic and client, therefore singleplayer is now a local server.

General

• Game no longer pauses when entering a command or pausing the game.

Debug screen

• Coordinates are now rounded to 5 digits.
• "ws", "fs" and "g" (Walking speed, flying speed and ground; "g" is true if the player is touching the ground).

Language

• Updated language files.

Texture packs

• Support and auto-download for server texture packs.

Server jar

• The server jar now accepts command-line arguments --demo, --port, --singleplayer, --universe, and --world. The old nogui argument still works for backward compatibility.

Infinite Map Visualizer

• Removed the infinite map visualizer from the game's source code.

Features broken by the internal server

• Many features were broken or significantly changed due to the client-server split, many of which still remain absent from the game.

Distance effects

• The particles from adding an eye of ender to an end portal frame block no longer appear offset if performed at high distances from the world origin.
  • This is due to the fact that they simply did not appear at all from this snapshot onward, which is another bug entirely.
  • This bug resurfaced in Java Edition 19w14a when the aforementioned absent particles bug was fixed.

Player

• The player "Notch" no longer drops an apple in addition to his inventory.

4 bugs fixed

• Fixed being unable to switch tools of the same kind in inventory.
• Fixed water destroying non-solid blocks when breaking them from above.
• Fixed picking a block in Creative with a tool in hand causing the tool to be lost.
• Fixed Silk Touch yielding only one slab from double slabs.

• In this version, when loading a singleplayer world, one needs to put minecraft.zip/server/minecraft_server.jar into .minecraft/server manually to continue loading.