SyncBot: Sync: updated from Minecraft

2026-09-13T11:10:57Z

Sync: updated from Minecraft

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	\|parent=1.4.2		\|parent=1.4.2
	\|date=September 28, 2012		\|date=September 28, 2012
	\|clientdl=~~[https://vault.~~omniarchive~~.uk/~~archive/java/client-release/1.4/pre/12w39b.jar Client] ([https://meta.celestia.sh/versions/v1/12w39b.json .json])		\|clientdl={{cdl\|omniarchive\|archive/java/client-release/1.4/pre/12w39b.jar\|Client}} ([https://meta.celestia.sh/versions/v1/12w39b.json .json])
	\|serverdl=~~[https://vault.~~omniarchive~~.uk/~~archive/java/server-release/1.4/pre/12w39b.jar Server]		\|serverdl={{cdl\|omniarchive\|archive/java/server-release/1.4/pre/12w39b.jar\|Server}}
	\|exedl=~~[https://vault.~~omniarchive~~.uk/~~archive/java/server-release/1.4/pre/12w39b.exe .exe]		\|exedl={{cdl\|omniarchive\|archive/java/server-release/1.4/pre/12w39b.exe\|.exe}}
	[[Category:Versions using legacy download site]]		[[Category:Versions using legacy download site]]
	\|prevparent=1.3.2		\|prevparent=1.3.2

SyncBot: Sync: new page from Minecraft

2026-06-10T11:10:08Z

Sync: new page from Minecraft

New page

{{Infobox version
|title=Minecraft 12w39b
|image=SP 12w39a image.png
|image2=Java Edition 12w39b.png
|edition=java
|type=Snapshot
|parent=1.4.2
|date=September 28, 2012
|clientdl=[https://vault.omniarchive.uk/archive/java/client-release/1.4/pre/12w39b.jar Client] ([https://meta.celestia.sh/versions/v1/12w39b.json .json])
|serverdl=[https://vault.omniarchive.uk/archive/java/server-release/1.4/pre/12w39b.jar Server]
|exedl=[https://vault.omniarchive.uk/archive/java/server-release/1.4/pre/12w39b.exe .exe]
[[Category:Versions using legacy download site]]
|prevparent=1.3.2
|prev=12w39a
|next=12w40a
|nextparent=1.4.4
}}<onlyinclude>

'''12w39b''' is the ninth [[Minecraft:snapshot]] for [[Minecraft:Java Edition 1.4.2]], released on September 28, 2012<ref>https://twitter.com/Dinnerbone/status/251683603593957376</ref> to fix some of the bugs and crashes in the [[Minecraft:12w39a]] snapshot.

== Additions ==
=== Blocks ===
'''[[Minecraft:Mob spawner]]s'''
* More options to customize spawners.
* Can now have their range and maximum spawn limit customized.

=== Items ===
'''Custom [[Minecraft:potion]]s'''
* Only available by editing in with a world editor.
* Players can create potions with multiple effects.

=== Command format ===
'''{{cmd|xp}}'''
* Added a command variable to the command.
** Use <code>L</code> after number to represent number of levels, not number of xp.

'''[[Minecraft:Target selector]]s'''
* Added command block arguments.
** Added <code>l</code> and <code>lm</code> arguments for indicating players with a maximum level, and minimum level, respectively.
** Added <code>rm</code> argument for indicating the minimum range to which players are affected.

== Fixes ==
'''7 bugs fixed'''
* Fixed block placement issues with lighting.<ref>{{tweet|dinnerbone|251685433568800768}}</ref>
* Game performance is now better from before.
* Fixed "Bottomless Pit" preset.
* Jack o' lantern emitting stronger light from the wrong face fixed.
* Fixed the witch's texture being weird.
* Partially fixed Nether lag by making the server do some of what used to be the client's work and increasing chunk load time slightly.<ref>{{tweet|dinnerbone|251623433505476608}}</ref>
* Fixed some lighting bugs related to upside down slabs and stairs and farmland.</onlyinclude>

== References ==
{{reflist}}

== Navigation ==
{{Navbox Java Edition versions|1.0}}

[[Category:Java Edition 1.4.2 development versions]]
[[Category:Java Edition development versions released in 2012]]

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Minecraft:Java Edition 12w39b - Revision history

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