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{{Dangerous version|multiple=true|edition=java|version= snapshot|type=crash + chunk corruption| The dedicated server for this version has a security vulnerability in the Log4j library that could be used to perform a remote code execution exploit. It can be addressed by appending a certain JVM argument to the server startup command line.
</br>
Exiting a world whilst respawning the ender dragon makes the world unopenable }}
{{Infobox version
|title=Minecraft 17w17a
|edition=Java
|image=17w17a.png
|image2=Java Edition 17w17a.png
|type=Snapshot
|date=April 26, 2017
|parent=1.12
|clienthash=fa78ab696aa02914171deb57e31cfb737506f272
|jsonhash=b2ffee6fc34b1f2cba708c544492ea939d6773fc
|serverhash=3795d253cfef44f1f1467422b4399d1770484dc0
|prevparent=1.11.2
|prev=17w16b
|next=17w17b
|nextparent=1.12.1
}}
<onlyinclude>

'''17w17a''' is the eighth [[Minecraft:snapshot]] for [[Minecraft:Java Edition 1.12]], released on April 26, 2017.<ref>{{snap|17w17a|April 26, 2017}}</ref>

== Additions ==
=== General ===
'''[[Minecraft:Advancement]]s'''
* Added 11 advancements and 2 advancement tabs: "Nether" and "The End".
** Advancements added in this version include:
{{AdvancementTable|Nether}}
{{AdvancementRow
|title=Nether
|bg=plain
|Nether Wart
|Bring summer clothes
|—
|Enter the [[Minecraft:nether portal block]].
|nether/root
}}
{{AdvancementRow
|title=Return to Sender
|bg=fancy
|Ghast Tear
|Destroy a Ghast with a fireball
|Nether
|Kill a [[Minecraft:ghast]] by deflecting a ghast fireball back into it via hitting or shooting a projectile at the fireball.
|nether/return_to_sender
}}
{{AdvancementRow
|title=A Terrible Fortress
|bg=plain
|Nether Bricks
|Break your way into a Nether Fortress
|Nether
|Enter a [[Minecraft:nether fortress]].
|nether/find_fortress
}}
{{AdvancementRow
|title=Spooky Scary Skeleton
|bg=plain
|Wither Skeleton Skull
|Obtain a wither skeleton's skull
|A Terrible Fortress
|Have an [[Minecraft:blaze rod]] in the inventory.
|nether/get_wither_skull
}}
{{AdvancementTable|foot}}
{{AdvancementTable|The End}}
{{AdvancementRow
|title=The End
|bg=plain
|End Stone
|Or the beginning?
|—
|Enter the [[Minecraft:end portal block]].
|end/root
}}
{{AdvancementRow
|title=Free the End
|bg=plain
|Dragon Head
|Good luck
|The End
|Kill the [[Minecraft:ender dragon]].
|end/kill_dragon
}}
{{AdvancementRow
|title=The Next Generation
|bg=oval
|Dragon Egg
|Hold the Dragon Egg
|Free the End
|Have a [[Minecraft:dragon egg]] in the inventory.
|end/dragon_egg
}}
{{AdvancementRow
|title=The End... Again...
|bg=oval
|End Crystal
|Respawn the ender dragon
|Free the End
|—
|end/respawn_dragon
}}
{{AdvancementRow
|title=You Need a Mint
|bg=oval
|Dragon's Breath
|Collect dragon's breath in a glass bottle
|Free the End
|Have a bottle of [[Minecraft:dragon's breath]] in the inventory.
|end/dragon_breath
}}
{{AdvancementRow
|title=City at the End of the Game
|bg=plain
|Purpur Block
|Go on in, what could happen?
|Remote Getaway
|Enter an [[Minecraft:end city]].
|end/find_end_city
}}
{{AdvancementRow
|title=Great View From Up Here
|bg=fancy
|Shulker Shell
|Levitate for at least 30 seconds
|City at the End of the Game
|Have the [[Minecraft:Levitation]] effect for at least 30 seconds.
|end/levitate
}}
{{AdvancementTable|foot}}
* New <code>levitation</code> trigger, with the following conditions:
** <code>duration</code> - number of ticks the player is levitating for.
** <code>distance</code> - distance the player levitated so far.
** Both can be either a range (<code>min</code> and / or <code>max</code>) or a value (<code>value</code>)
* New <code>feature</code> condition added to the <code>location</code> trigger.
** The value is a feature name as used in the {{cmd|locate}} command.

'''[[Minecraft:NBT format]]'''
* <code>UpdateLastExecution</code> (byte):
** Defaults to <code>1b</code>. If set to <code>0b</code>, loops can be created, where the same command block can run multiple times in one tick.
* <code>LastExecution</code> (long):
** Stores the tick a chain command block was last executed in.
* <code>toBeDisplayed</code> (list):
** Added into the <code>recipeBook</code> compound of the player.
** Within are recipe names that the player has unlocked but not viewed in the crafting helper yet.
** Used for remembering to play the animation for new recipes.

'''[[Minecraft:Sound]]s'''
* New [[Minecraft:note block]] sounds:
** {{BlockLink|Bone block}} = xylophone
** {{BlockLink|Block of gold}} = bell
** {{BlockLink|Clay}} = flute
** {{BlockLink|Packed ice}} = chime
** {{BlockLink|Wool}} = guitar

* New sound effects:
** [[Minecraft:Parrot]]s
** [[Minecraft:Illusioner]]s
** Casting a [[Minecraft:fishing rod]]
** Reeling in a fishing rod
** Throwing an [[Minecraft:eye of ender]]
** An eye of ender exploding or popping back into item form
** Putting ender eye in [[Minecraft:end portal frame]]s
** Completing the [[Minecraft:end portal]] and activating it
** [[Minecraft:Boat]] paddles

== Changes ==
=== Blocks ===
'''[[Minecraft:Terracotta]]'''
* It has now unique colors on the [[Minecraft:map]].

'''[[Minecraft:Bed]]s'''
* Each leg can now be [[Minecraft:Resource pack|textured]] individually.

=== Mobs ===
'''[[Minecraft:Illusioner]]s'''
* Its Blindness spell is only cast if the [[Minecraft:regional difficulty]] is 3 or above.

'''[[Minecraft:Shulker]]s'''
* Reverted the purple shulker color change from [[Minecraft:17w16a]].

=== Command format ===
* {{cmd|advancement}}:
** Added five modifiers to the {{cmd|advancement grant}} and {{cmd|advancement revoke}} commands:
*** "everything" - all advancements, no specification required (same as "*")
*** "from" - this advancement, its children, and their children, etc.
*** "until" - this advancement, its parent, and its parent, etc.
*** "through" - both of the above
*** "only" - this advancement, and nothing else
** Examples:
*** {{cmd|advancement grant dinnerbone until story/form_obsidian}}
*** {{cmd|advancement revoke dinnerbone everything}}

=== General ===
'''[[Minecraft:Advancement]]s'''
* Changed and moved around many existing advancements:
** "Withering Heights" is now an offspring of "Spooky Scary Skeleton".
** "Into Fire" is now an offspring of "A Terrible Fortress".
** "Remote Getaway" is now an offspring of "Free the End", and works properly when player throws an ender pearl into the [[Minecraft:gateway]].
** "Sky's the Limit" is now an offspring of "City at the End of the Game", and is now a "goal" type advancement.
** "Zombie Doctor" and "Eye Spy" are now offspring of "We Need to Go Deeper".
** "Eye Spy" now requires the player to enter the [[Minecraft:stronghold]].
** "A Weak Brew" was replaced with "Local Brewery" (<code>nether/brew_potion</code>), which is an offspring of "Into Fire" and requires the player to retrieve any potion from a [[Minecraft:brewing stand]].
** Illusioner now counts for "Monster Hunter" and is required for "Monsters Hunted", which makes the advancement unobtainable.
** "Sniper Duel" not requires a skeleton to be killed.
* Advancements can now execute commands when achieved.
** The command written in the rewards section of the advancement is executed as the player (for example writing <code>/say @s</code> would be equivalent to <code>/execute <the_player_who_obtained_this_advancement> ~ ~ ~ say @s</code>)
* Advancement icons now allow data values.
** Specifically, <code>icon</code> has switched from being a string to an object.
*** Within it are a required <code>item</code> string (specifying the item ID) and an optional <code>data</code> integer, specifying the metadata of the item
* The "damage flags object" now contains two new entity objects:
** <code>source_entity</code> - specifies the "owner" of the damage that was dealt.
** <code>direct_entity</code> - specifies the direct cause of the damage.

'''[[Minecraft:Crafting]]'''
* Optimized the [[Minecraft:recipe book]].

== Fixes ==
{{fixes|fixedin=17w17a|prefix=Minecraft
|;old
|116623|Stained hardened clay / terracotta blocks do not have correct color on map
|;dev
|114979|advancement command doesn't allow bulk grant/revoking
|115056|"Remote Getaway" advancement cannot be obtained by using ender pearls
|115170|Advancements Test Command Success Uses the Wrong Translation
|115173|Unsuccessful advancement test command has player and advancement name interchanged
|115442|Advancement alerts aren't aligned to the top-right corner
|115574|"Sniper Duel" advancement triggered when killing non-skeleton mob at distance
|115740|Inconsistent error message for /advancement grant @p *
|115805|Fences/panes/walls/bars/torches connect to a number of non-solid blocks
|115821|Tooltips with long titles in the advancements menu are cut off
|115880|'Take Aim' advancement granted by projectiles other than arrows
|115936|Narrator does not properly read output from /say, /tell and /tellraw command
|115940|Division by zero crash with alternating /recipe commands
|116016|Advancement "adventure/trade" uses criteria named "shot_arrow"
|116245|"Zombie Doctor" advancement description has a period, while others don't
|;previous
|116471|Conditional command blocks SuccessCount doesn't update
|116514|"durability" option for item-based triggers succeeds for items without durability
|116516|"item_durability_changed" triggers when base change is 0, but not when Unbreaking reduces the change to 0
|116536|Recipe red/white outline is inconsistent while searching
|116650|Wooden fences connect to nether brick fence
}}</onlyinclude>

== Videos ==
{{slicedlime|8wfLFwwRwaI}}

== Trivia ==
* 17w17a 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 17w17a - Revision history

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