Java Edition 17w18a

The pre-reupload version of this release is lost.

 

While this version is known to exist, it has not been archived in the launcher or elsewhere, and is therefore considered lost.
If you believe you have a copy of this version, please post it on the talk page.

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 17w18a

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17w18a is the tenth snapshot for Java Edition 1.12, released on May 3, 2017.^[2] It was later reuploaded to fix an aspect ratio issue.^[3]

Gamerules

• /gamerule announceAdvancements
  • Defaults to true.
  • Toggles announcing of advancements in chat, replacing the old server.properties entry.

/reload

• Command to reload advancements and loot tables from disk.
• This command is available to all opped players in single player and to all level 4 operators on a multiplayer server.
• Cannot be run from a command block.

Advancements

• Re-introduced announcements to chat when someone earns an advancement.
  • Shows the description on hover, like before with achievements.
• Added three advancements to the "Adventure" tab:

Adventure
Icon	Advancement	In-game description	Parent	Actual requirements (if different)	Resource location	Rewards
	Best Friends Forever	Tame an animal	Sweet dreams	Tame one of these 7 tameable mobs: ocelot, donkey, horse, mule, wolf, parrot, llama.	adventure/tame_an_animal	—
	The Parrots and the Bats	Breed two animals together	Sweet dreams	Breed a pair of any of these 10 mobs: sheep, cows, pigs, rabbits, chickens, horses, wolves, ocelots, mooshrooms, and llamas.	adventure/breed_an_animal	—
	Two by Two	Breed all the animals!	The Parrots and the Bats	Breed a pair of each of the mobs mentioned above.	adventure/bred_all_animals	—

• Added new minecraft:tick trigger.
  • Activates for each player on every tick, provided that the advancement was revoked before the next tick starts.
• Added new minecraft:tame_animal trigger.
  • Activates whenever the player tames an animal. The entity condition can be specified to check that the animal that was tamed.
• Added new show_toast 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 announce_to_chat 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.

Command blocks

• Optimized error conditions.

Maps

• 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.

/give and /replaceitem

• Now reinforce item-specific stacking restrictions.^[4]
  • This is a reverse of 16w32a. (MC-105965 resolved as "Works as Intended")

Advancements

• "entity" objects and the minecraft:levitation trigger now use a shared "distance" object.
  • Check if the player is within or outside of the specified range on the x, y, or z axis (in either the positive or negative direction).
  • absolute and horizontal ranges check if the player is within range on all axes, though horizontal 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 JSON.

Narrator

• Optimized, it should work for more people now.

Recipe books

• Some optimizations.
• If the player searches "excitedze" in the recipe book, their language switches to Pirate Speak.
  • Searching "excited" no longer does this.

21 issues fixed

From the 1.12 development versions

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

From the previous development version

• MC-116931 – Crash when placing a snow layer on top of a fence gate

From the current version, hotfixed

• Fixed an aspect ratio issue.

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

• 
  "Adventure" advancement tree in 17w18a.