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{{Lost version|pre-reupload}}
{{log4j vulnerability|dev=true}}
{{Infobox version
|title=Minecraft 17w18a
|edition=Java
|image=17w18a.png
|image2=Java Edition 17w18a.png
|type=Snapshot
|date=May 3, 2017
|parent=1.12
|downloads= '''Original:''' Original client unavailable 
[[Minecraft:pistondataraw:mc/game/17w18a/server/59fccdc6b26b9298231a1231db66136ae451817e/server.jar|Server]] 
'''Reupload:''' 
{{dl|9eda8162e92b2db820a140f4b4d8fc7b70d32b3a|client}} ({{dl|03ca07f26b8336732e720ecd13e912e19f0d3a77|json|name=17w18a}}) 
{{dl|b1f45946bd74f4e2cf1833324770809ebcd0b7b1|server}}
|prevparent=1.11.2
|prev=17w17b
|next=17w18b
|nextparent=1.12.1
}}<onlyinclude>

'''17w18a''' is the tenth [[Minecraft:snapshot]] for [[Minecraft:Java Edition 1.12]], released on May 3, 2017.<ref>{{snap|17w18a|May 3, 2017}}</ref> It was later reuploaded to fix an aspect ratio issue.<ref>{{tweet|Dinnerbone|859772714571247616|The aspect ratio is really wrong - I'm gonna fix it as soon as I get some time. Sorry! :(}}</ref>

== Additions ==
=== Gameplay ===
'''Gamerules'''
* {{cmd|gamerule announceAdvancements}}
** Defaults to true.
** Toggles announcing of advancements in chat, replacing the old <code>server.properties</code> entry.

=== Command format ===
{{cmd|reload}}
* Command to reload advancements and loot tables from disk.
* This command is available to all [[Minecraft:op]]ped players in single player and to all level 4 operators on a multiplayer server.
* Cannot be run from a [[Minecraft:command block]].

=== General ===
'''[[Minecraft:Advancement]]s'''
* Re-introduced announcements to chat when someone earns an advancement.
** Shows the description on hover, like before with [[Minecraft:achievement]]s.
* Added three advancements to the "Adventure" tab:

{{AdvancementTable|Adventure}}
{{AdvancementRow
|title=Best Friends Forever
|bg=plain
|Lead
|Tame an animal
|Sweet dreams
|Tame one of these 7 tameable mobs: [[Minecraft:ocelot]], [[Minecraft:donkey]], [[Minecraft:horse]], [[Minecraft:mule]], [[Minecraft:wolf]], [[Minecraft:parrot]], [[Minecraft:llama]].
|adventure/tame_an_animal
}}
{{AdvancementRow
|title=The Parrots and the Bats
|bg=plain
|Wheat
|Breed two animals together
|Sweet dreams
|Breed a pair of any of these 10 mobs: [[Minecraft:sheep]], [[Minecraft:cow]]s, [[Minecraft:pig]]s, [[Minecraft:rabbit]]s, [[Minecraft:chicken]]s, [[Minecraft:horse]]s, [[Minecraft:wolves]], [[Minecraft:ocelot]]s, [[Minecraft:mooshroom]]s, and [[Minecraft:llama]]s.
|adventure/breed_an_animal
}}
{{AdvancementRow
|title=Two by Two
|bg=fancy
|Golden Carrot
|Breed all the animals!
|The Parrots and the Bats
|Breed a pair of each of the mobs mentioned above.
|adventure/bred_all_animals
}}
{{AdvancementTable|foot}}

* Added new <code>minecraft:tick</code> trigger.
** Activates for each player on every tick, provided that the advancement was revoked before the next tick starts.
* Added new <code>minecraft:tame_animal</code> trigger.
** Activates whenever the player tames an animal. The <code>entity</code> condition can be specified to check that the animal that was tamed.
* Added new <code>show_toast</code> display option.
** Optional boolean defaulting to true. When false, the specified advancement does not display the toast popup when the advancement is fulfilled.
* Added new <code>announce_to_chat</code> display option.
** Optional boolean defaulting to true. When false, this specific advancement does not announce the player fulfilling it to the chat for all players to see.

== Changes ==
=== Blocks ===
'''[[Minecraft:Command block]]s'''
* Optimized error conditions.

=== Items ===
'''[[Minecraft:Map]]s'''
* Changed some map colors around, again.
** Reverted the wool colors on maps.
** Moved dyed blocks such as banners to the new terracotta map color palette.

=== Command format ===
{{cmd|give}} and {{cmd|replaceitem}}
* Now reinforce item-specific stacking restrictions.<ref name=":0">{{bug|MC-117005}} resolved as "Works as Intended"</ref>
** This is a reverse of 16w32a. ({{bug|MC-105965}} resolved as "Works as Intended")

=== General ===
'''[[Minecraft:Advancement]]s'''
* "entity" objects and the <code>minecraft:levitation</code> trigger now use a shared "distance" object.
** Check if the player is within or outside of the specified range on the <code>x</code>, <code>y</code>, or <code>z</code> axis (in either the positive or negative direction).
** <code>absolute</code> and <code>horizontal</code> ranges check if the player is within range on all axes, though <code>horizontal</code> excludes the Y axis.
* Changed the "Great View From Up Here" advancement to 50 vertical blocks.
* Changed the "Sniper Duel" advancement to horizontal distance.
* Advancement loading is now strict [[Minecraft:JSON]].

'''[[Minecraft:Narrator]]'''
* Optimized, it should work for more people now.

'''[[Minecraft:Recipe book]]s'''
* Some optimizations.
* If the [[Minecraft:player]] searches "'''excitedze'''" in the recipe book, their language switches to Pirate Speak.
** Searching "'''excited'''" no longer does this.

== Fixes ==
{{fixes|fixedin=17w18a|prefix=Minecraft
|;dev
|113374|Map color palette changed
|114966|Advancements overlap other advancements
|115323|Parrots spawn rarely in Jungle
|115577|Parrot play the flapping wings(fly) sound, when player push it
|115774|Parrots still make sounds when they are on player shoulder and Silent:1b
|115810|Custom resource pack added sounds not playing
|115902|Flying parrots will not avoid lava
|116482|The server.properties file still has announce-player-achievements
|116498|You can't place ladders on the back of stairs
|116515|Placing a torch on a wall with a fence gate underneath causes crash
|116534|Pressing "Showing craftable" sometimes doesn't show any recipes
|116537|Stopping jukebox music while a sitting parrot is dancing occasionally causes the parrot's entire upper body to be misplaced.
|116574|"showing craftable" option has several issues
|116586|Items in crafting grid disappear if the inventory is not properly closed
|116638|Oak Wood in Recipe Book
|116670|No toast is shown for first advancement made
|116675|Debug messages are printed in log when levitating
|116704|The sound block.note.chime is sharp
|116713|Creating new world with same name crashes with NullPointerException
|;previous
|116931|Crash when placing a snow layer on top of a fence gate
|otherissuescount=1}}
'''From the current version, hotfixed'''
* Fixed an aspect ratio issue.</onlyinclude>

== Videos ==
{{slicedlime|aczLMFJZCuE}}

== Trivia ==
* 17w18a (the reuploaded version) was previously removed from the [[Minecraft:launcher]] for some time, but was added back in September 2018.
* The pre-reupload of this snapshot is currently the latest unarchived version of [[Minecraft:Java Edition]].

== Gallery ==
<gallery>
Adventure_advancement_tree_17w18a.png|"Adventure" advancement tree in 17w18a.
</gallery>

== References ==
{{reflist}}

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

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Minecraft:Java Edition 17w18a - Revision history

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