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{{log4j vulnerability|dev=true}}
{{Infobox version
|title=Minecraft 1.12-pre1
|edition=Java
|image=1.12-pre1.png
|image2=Java Edition 1.12-pre1.png
|type=Pre-release
|date=May 10, 2017
|parent=1.12
|clienthash=451d983529e78b807c8f8479f7f542863b1b6ae0
|jsonhash=51695897d818f3414ce5dbea33dea58682c6dc44
|serverhash=ebcafa3e1a3312500893087bf4bfb6c6f335ef0e
|prevparent=1.11.2
|prev=17w18b
|next=1.12-pre2
|nextparent=1.12.1
}}<onlyinclude>

'''1.12-pre1''' is the first pre-release for [[Minecraft:Java Edition 1.12]], released on May 10, 2017,<ref>{{Mcnet|minecraft-112-pre-release-2|Minecraft 1.12 Pre-Release 1}}</ref> which adds four new advancements, optimizes the recipe book and fixes bugs. This is the first pre-release released in 2017.

== Additions ==
=== Mobs ===
'''[[Minecraft:Parrot]]'''
* Added new [[Minecraft:attribute]]: <code>generic.flyingSpeed</code>.
** Due to this their <code>generic.movementSpeed</code> has been lowered from <code>0.40</code> to <code>0.20</code>.

=== Gameplay ===
'''[[Minecraft:Gamerule]]'''
* <code>gameLoopFunction <namespace:path/to/function/file></code>
** Runs a function every [[Minecraft:tick]] through the server.

=== Command format ===
{{cmd|function <namespace:path/to/function/file>}}
* Runs a function once through the [[Minecraft:entity]] or [[Minecraft:command block]] which ran the /function command.

=== General ===
'''[[Minecraft:Advancement]]s'''
* Added 4 new advancements:
{{AdvancementTable|Nether/Adventure}}
{{AdvancementRow
|title=A Furious Cocktail
|bg=fancy
|Milk Bucket
|Have every potion effect applied at the same time
|Local Brewery
|{{Collapse
|title=Have ''all'' of these 11 status [[Minecraft:effect]]s applied to the player at the same time:
|content={{flatlist|class=searchaux|indent=1|
* {{EffectLink|Fire Resistance}}
* {{EffectLink|Invisibility}}
* {{EffectLink|Jump Boost}}
* {{EffectLink|Night Vision}}
* {{EffectLink|Poison}}
* {{EffectLink|Regeneration}}
* {{EffectLink|Slowness}}
* {{EffectLink|Speed}}
* {{EffectLink|Strength}}
* {{EffectLink|Water Breathing}}
* {{EffectLink|Weakness}}
}}
|expanded=1}}
The source of the effects is irrelevant for the purposes of this advancement. Other status effects may be applied to the player, but are ignored for this advancement.
|nether/all_potions
}}
{{AdvancementRow
|title=Subspace Bubble
|bg=fancy
|Empty Map
|Use [[Minecraft:the Nether]] to travel 7km in the [[Minecraft:Overworld]]
|Nether
|Use the Nether to travel between 2 points in the Overworld with a minimum horizontal euclidean distance of 7000 blocks between each other, which is 875 blocks in the Nether.
|nether/fast_travel
}}
{{AdvancementRow
|title=Uneasy Alliance
|bg=fancy
|Ghast Tear
|Rescue a [[Minecraft:ghast]] from the Nether, bring it safely home to the Overworld... and then kill it.
|Return to Sender
|Kill a ghast while being in the Overworld.
|nether/uneasy_alliance
}}
{{AdvancementRow
|title=Postmortal
|bg=oval
|Totem of Undying
|Use a [[Minecraft:totem of undying]] to cheat death
|Monster Hunter
|Activate a totem of undying by taking fatal damage.
|adventure/totem_of_undying
}}
{{AdvancementTable|foot}}

* Added {{nbt|boolean|hidden}} field to advancement display info, defaults to false.
* Added new <code>effects_changed</code>, <code>used_totem</code>, <code>nether_travel</code> advancements triggers.
* Added {{nbt|string|function}} to advancement rewards.

'''[[Minecraft:Function (Java Edition)|Function]]s'''
* Added new function system, which are plaintext files in <code>world/data/functions/namespace/file.txt</code>.
* Functions are a list of [[Minecraft:commands]], one line per command, with <code>//</code> or <code>#</code> comment support.

'''[[Minecraft:NBT format]]'''
* Added the {{nbt|compound|enteredNetherPosition}} tag for [[Minecraft:player]]s.

== Changes ==
'''[[Minecraft:Advancement]]s'''
* Advancement trees are now centered in the UI.
* [[Minecraft:Item]]s & [[Minecraft:entities]] in advancements have an extra <code>NBT</code> field (string NBT, like in commands).
* Entities in advancements have an extra <code>effects</code> and <code>location</code> field.
* Removed <code>commands</code> from advancement rewards.
* Removed <code>arbitrary_player_tick</code> advancement trigger.

'''[[Minecraft:Recipe book]]s'''
* Optimized the recipe book.

== Fixes ==
{{fixes|fixedin=1.12 Pre-Release 1|prefix=Minecraft
|;old
|11240|Ignited TNT can be set on fire by a Flame Bow.
|50166|Game states that "The block couldn't be placed" when using /setblock to place air in a space occupied by a tile entity, despite working
|95367|Tamed [wolf], cat or parrot in a minecart teleports to a player (not visually)
|100468|[Wolves], cats and parrots teleport to player despite being in a boat (yet not visually)
|111699|Can't rename stacked items
|111744|Anvil outputs only 1 item when renaming
|;dev
|113380|Concrete powder won't turn into concrete when replacing water
|113434|The color of white wool sheep is light gray
|114235|Concrete powder texture is not randomly rotated
|114534|Beacon beam is darker than it should be
|115070|Issue with crafting table UI on non-16:9 instances
|115206|Parrots stare at bats over 30 blocks away, through the ground
|115460|Recipe advancements for yellow dye have reversed unlock conditions
|115813|Old (non-dyed) beds are invisible
|116024|Pre-17w15a beds become red if in-world but white in chests
|116459|Parrots suffocate when getting in a bed with a solid block behind it
|116760|@a selector doesn't work with the /recipe command in multiplayer
|116945|Knowledge book gives recipe before removing itself from inventory causing unexpected advancement behavior
|116952|Can't read CPU info and shows <code>'CPU: <nowiki><unknown></nowiki>'</code> in the debug screen (F3)
|116957|Advancement doesn't get revoked when /reload is quickly executed afterwards
|116963|Changing dimension prints debug message in log
|116964|Parrots sometimes run in circles instead of pathfinding normally.
|117001|"Serious dedication" challenge is granted when breaking any tool
|117007|milk_bucket can't trigger consume_item of advancements
|117008|Vines under trapdoors block them
|117015|Glass panes & iron bars no longer connect to glass
|117019|Tripwire hooks break off of backs and sides of stairs upon receiving a block update
|117036|17w18b Crafting book glitch
|117063|Snow layers on barriers
|117069|Door in Recipe Book when hold click shows the trapdoor recipe
|117118|Levers / buttons placed on the trapdoor are dropped if pressed
|117160|Parrots follow and watch invisible mobs
|117161|Parrots imitate silent mobs
|117167|Error message for player advancement data containing only "null" calls advancements "achievement"
}}</onlyinclude>

== Videos ==
{{slicedlime|DcFs4kwdr9M}}

== Trivia ==
* 1.12-pre1 was previously removed from the [[Minecraft:launcher]] for some time, but was added back in September 2018.

== References ==
{{reflist}}

== Navigation ==
{{Navbox Java Edition versions|1.1x}}

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Minecraft:Java Edition 1.12-pre1 - Revision history

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