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{{log4j vulnerability|dev=true}}
{{Infobox version
|title=Minecraft 17w16a
|edition=Java
|image=17w16a.png
|image2=Java Edition 17w16a.png
|type=Snapshot
|date=April 20, 2017
|parent=1.12
|clienthash=2b7de5e297fda9fc35500c6db18627be00ad003c
|jsonhash=4baeef9effd9d3eacdb6bef1a974f20be394278b
|serverhash=47cfe5d44ccf6333b697da3e82e35bb3725e53d8
|prevparent=1.11.2
|prev=17w15a
|next=17w16b
|nextparent=1.12.1
}}<onlyinclude>

'''17w16a''' is the sixth [[Minecraft:snapshot]] for [[Minecraft:Java Edition 1.12]], released on April 20, 2017.<ref>{{snap|17w16a|id=b|April 20, 2017}}</ref>

== Additions ==
=== Blocks ===
'''[[File:Note Block JE1 BE1.png|32px]] [[Minecraft:Note block]]s'''
* When placed on top of a bone block, wool, clay, packed ice, or gold blocks, the note block produces no sound when altered or activated (this is to make place for new note block sounds coming up).
** Added sound events (when using {{cmd|playsound}}) for the following:
*** <code>minecraft:block.note.bell</code>
*** <code>minecraft:block.note.chime</code>
*** <code>minecraft:block.note.flute</code>
*** <code>minecraft:block.note.guitar</code>
*** <code>minecraft:block.note.xylophone</code>

=== Mobs ===
'''[[File:Illusioner JE1.png|24px]] [[Minecraft:Illusioner]]s '''
* New [[Minecraft:illager]].
* Affects players with {{EffectLink|Blindness}} for 20 seconds then shoots with a [[Minecraft:bow]].
* Summons duplicates of itself.
** All duplicates show the shooting animation, but only the real one, which is invisible, can be attacked.
* Does not have a [[Minecraft:spawn egg]] and therefore can only be summoned with {{cmd|summon illusion_illager}}.
* Targets [[Minecraft:player]]s, adult [[Minecraft:villager]]s, [[Minecraft:wandering trader]]s, and [[Minecraft:iron golem]]s.

=== Command format ===
'''Selectors'''
* <code>@s</code>
* Targets the executing entity, e.g: <code>/[[Minecraft:execute]] @e[type=Villager] ~ ~ ~ /say @s</code>

=== General ===
[[File:Hints.png|thumb|All the tutorial hints]]
'''<nowiki>Version exclusive: </nowiki>[[Minecraft:Tutorial hints]]'''
* Displayed in the top right.
* Display only in [[Minecraft:Survival]] mode, and only upon starting a new world for the first time.
** Saved per player, stored in [[Minecraft:options.txt]].
*** Name: <code>tutorialStep</code>
*** List of criteria: {{cd|d=and|movement|find_tree|punch_tree|open_inventory|craft_planks|none}}.

'''[[Minecraft:Controls]]'''
* '''Version exclusive''': Added keybinding options for [[Minecraft:Creative]] mode saving to [[Minecraft:saved toolbars]].

'''JSON format'''
* Added 'group' to recipe JSON format, to clump similar recipes together.
* Added new 'keybind' text component, to refer to the player's keybindings.

== Changes ==
=== Blocks ===
'''[[Minecraft:Hardened clay]]'''
* Renamed to terracotta.

'''[[Minecraft:Glazed terracotta]]'''
* No longer "stick" to [[Minecraft:slime block]]s, but can still be pushed by pistons.

'''[[Minecraft:Shulker box]]es'''
* Colors changed in accordance with the changes to other block colors.
** This causes the 'default' (purple) shulker boxes to be a vibrant purple that mismatches all other purpur items and blocks (reverted in [[Minecraft:17w17a]]).

'''[[Minecraft:Command block]]s'''
* Now executes all of the commands in a chain before scheduling them for the next tick.
** It is now possible to stop/modify the operation of a chain via commands and get results instantly (as opposed to getting them in a 1 tick delay).

=== Items ===
'''[[Minecraft:Fishing rod]]s'''
* '''Version exclusive''': Added sounds for reeling in the fishing bobber.

=== Mobs ===
[[File:NewShulkerColors.png|thumb|right|250px|Comparison of old and new shulker and shulker box colors]]
'''[[Minecraft:Shulker]]s'''
* Colors changed in accordance with the changes to other block colors.
** This causes the 'default' (purple) shulkers to be a vibrant purple that mismatches all other purpur items and blocks (reverted in [[Minecraft:17w17a]]).

=== General ===
'''[[Minecraft:Narrator]]'''
* Now displays a message whenever it isn't available.

'''[[Minecraft:Controls]]'''
* '''Version exclusive''': Pressing {{key|F1}} now hides all toast messages.

'''[[Minecraft:NBT format]]'''
* Improved NBT parsing in commands.
** Keys can now (optionally) be quoted, e.g: <code>"Motion":[0.0,0.0,0.0]</code>
** Unquoted string values are now stricter; they can no longer contain spaces or special symbols, e.g: <code>CustomName:Test Test</code>
** Indices, which were previously optional in lists, are no longer allowed, e.g: <code>Motion:[0:7.3,1:1.0,2:3.1]</code>
** Empty keys and values are no longer allowed.
* Improved error messaging; now points to where exactly the error occurred.

== Fixes ==
{{fixes|fixedin=17w16a|prefix=Minecraft
|;old
|9565|Fences and Cobblestone Walls connect to Fence Gates, which are facing the other direction
|95560|Wrong command message: The last character of NBT parsing error message is missing
|97662|NBT parser regex checks for pipebars as tag declaration
|114219|NBT integer array regex matches non-integer arrays
|114220|NBT integer arrays have a trailing comma in the string representation
|;dev
|113915|Inadvertently saving/overwriting saved hotbars due to stuck modifier key
|114889|Parrots on shoulders disappear when flying up in creative or spectator mode
|115046|Recipe book icon changes when wearing enchanted armor
|115336|Closing crafting menu drops or deletes items in some cases
|115528|Local client crashes when using the new shift-click recipe book in a server
|115603|Shift clicking recipe deletes other applicable items with different meta data
|;previous
|115797|Server output shows errors and nothing else
|115802|Crash when going to Statistics/items-blocks or trying to customize Superflat settings
|115806|Clicking on coloring white bed recipe selects creating bed recipe (placing planks in armor slots of a player)
|115807|Game crash if right clicked on the underside of block with torch in hand
|115809|Advancements/recipes notifications don't show correctly in F1 mode.
|115812|{{key|Shift}} + {{key|F3}} crashes the game
|115837|Gap between advancements and recipe toast
|115873|Can't drop items by clicking outside of inventory
|115938|Toasts darken in some GUIs and while some tooltips are displayed
|115942|Parrots imitating mobs causes null pointer exception
|116004|"Parrot" isn't translatable in the "imitates" subtitle
|116136|Parrots are invisible when on shoulder
|116213|Parrots on your shoulder change color when the player is wearing an enchanted elytra
|116314|Bows destroy other bows while crafting using recipe book
|116316|Shulker boxes not matching the new hues
|;hotfix
|116352|Crash when opening the chat settings
}}</onlyinclude>

== Videos ==
{{slicedlime|GzfEJqBxahY}}

== Trivia ==
* 17w16a 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 17w16a - Revision history

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