Java Edition 17w17a

This page covers a development version that has a major issue under certain conditions.

 

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.^[1]

Minecraft 17w17a

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17w17a is the eighth snapshot for Java Edition 1.12, released on April 26, 2017.^[2]

Advancements

• Added 11 advancements and 2 advancement tabs: "Nether" and "The End".
  • Advancements added in this version include:

Nether
Icon	Advancement	In-game description	Parent	Actual requirements (if different)	Resource location	Rewards
	Nether	Bring summer clothes	—	Enter the nether portal block.	nether/root	—
	Return to Sender	Destroy a Ghast with a fireball	Nether	Kill a ghast by deflecting a ghast fireball back into it via hitting or shooting a projectile at the fireball.	nether/return_to_sender	—
	A Terrible Fortress	Break your way into a Nether Fortress	Nether	Enter a nether fortress.	nether/find_fortress	—
	Spooky Scary Skeleton	Obtain a wither skeleton's skull	A Terrible Fortress	Have an blaze rod in the inventory.	nether/get_wither_skull	—

The End
Icon	Advancement	In-game description	Parent	Actual requirements (if different)	Resource location	Rewards
	The End	Or the beginning?	—	Enter the end portal block.	end/root	—
	Free the End	Good luck	The End	Kill the ender dragon.	end/kill_dragon	—
	The Next Generation	Hold the Dragon Egg	Free the End	Have a dragon egg in the inventory.	end/dragon_egg	—
	The End... Again...	Respawn the ender dragon	Free the End	—	end/respawn_dragon	—
	You Need a Mint	Collect dragon's breath in a glass bottle	Free the End	Have a bottle of dragon's breath in the inventory.	end/dragon_breath	—
	City at the End of the Game	Go on in, what could happen?	Remote Getaway	Enter an end city.	end/find_end_city	—
	Great View From Up Here	Levitate for at least 30 seconds	City at the End of the Game	Have the Levitation effect for at least 30 seconds.	end/levitate	—

• New levitation trigger, with the following conditions:
  • duration - number of ticks the player is levitating for.
  • distance - distance the player levitated so far.
  • Both can be either a range (min and / or max) or a value (value)
• New feature condition added to the location trigger.
  • The value is a feature name as used in the /locate command.

NBT format

• UpdateLastExecution (byte):
  • Defaults to 1b. If set to 0b, loops can be created, where the same command block can run multiple times in one tick.
• LastExecution (long):
  • Stores the tick a chain command block was last executed in.
• toBeDisplayed (list):
  • Added into the recipeBook 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.

Sounds

• New note block sounds:
  • Bone block = xylophone
  • Block of gold = bell
  • Clay = flute
  • Packed ice = chime
  • Wool = guitar

• New sound effects:
  • Parrots
  • Illusioners
  • Casting a fishing rod
  • Reeling in a fishing rod
  • Throwing an eye of ender
  • An eye of ender exploding or popping back into item form
  • Putting ender eye in end portal frames
  • Completing the end portal and activating it
  • Boat paddles

Terracotta

• It has now unique colors on the map.

Beds

• Each leg can now be textured individually.

Illusioners

• Its Blindness spell is only cast if the regional difficulty is 3 or above.

Shulkers

• Reverted the purple shulker color change from 17w16a.

• /advancement:
  • Added five modifiers to the /advancement grant and /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:
    • /advancement grant dinnerbone until story/form_obsidian
    • /advancement revoke dinnerbone everything

Advancements

• 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 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 stronghold.
  • "A Weak Brew" was replaced with "Local Brewery" (nether/brew_potion), which is an offspring of "Into Fire" and requires the player to retrieve any potion from a 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 /say @s would be equivalent to /execute <the_player_who_obtained_this_advancement> ~ ~ ~ say @s)
• Advancement icons now allow data values.
  • Specifically, icon has switched from being a string to an object.
    • Within it are a required item string (specifying the item ID) and an optional data integer, specifying the metadata of the item
• The "damage flags object" now contains two new entity objects:
  • source_entity - specifies the "owner" of the damage that was dealt.
  • direct_entity - specifies the direct cause of the damage.

Crafting

• Optimized the recipe book.

20 issues fixed

From released versions before 1.12

• MC-116623 – Stained hardened clay / terracotta blocks do not have correct color on map

From the 1.12 development versions

• MC-114979 – advancement command doesn't allow bulk grant/revoking
• MC-115056 – "Remote Getaway" advancement cannot be obtained by using ender pearls
• MC-115170 – Advancements Test Command Success Uses the Wrong Translation
• MC-115173 – Unsuccessful advancement test command has player and advancement name interchanged
• MC-115442 – Advancement alerts aren't aligned to the top-right corner
• MC-115574 – "Sniper Duel" advancement triggered when killing non-skeleton mob at distance
• MC-115740 – Inconsistent error message for /advancement grant @p *
• MC-115805 – Fences/panes/walls/bars/torches connect to a number of non-solid blocks
• MC-115821 – Tooltips with long titles in the advancements menu are cut off
• MC-115880 – 'Take Aim' advancement granted by projectiles other than arrows
• MC-115936 – Narrator does not properly read output from /say, /tell and /tellraw command
• MC-115940 – Division by zero crash with alternating /recipe commands
• MC-116016 – Advancement "adventure/trade" uses criteria named "shot_arrow"
• MC-116245 – "Zombie Doctor" advancement description has a period, while others don't

From the previous development version

• MC-116471 – Conditional command blocks SuccessCount doesn't update
• MC-116514 – "durability" option for item-based triggers succeeds for items without durability
• MC-116516 – "item_durability_changed" triggers when base change is 0, but not when Unbreaking reduces the change to 0
• MC-116536 – Recipe red/white outline is inconsistent while searching
• MC-116650 – Wooden fences connect to nether brick fence

• 17w17a was previously removed from the launcher for some time, but was added back in September 2018.