Java Edition 17w15a

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 17w15a

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17w15a is the fifth snapshot for Java Edition 1.12, released on April 12, 2017,^[2] which adds colored beds.

Beds

• Added colored beds which can be crafted with colored wool or by dyeing a white bed.
• Now bounce the player like slime blocks, albeit much less.
• Now reduce (but not negate) fall damage when landed on.
  • The player can survive a 41 block fall onto a bed.
    • Any higher, and the second bounce deal the remaining amount of damage to kill them.
  • The player can survive a 45 block fall onto a bed if they don't take further fall damage (e.g. by landing on a platform).
• Now a block entity, and each half can be colored individually using the color tag.
• Now use a 3D item model instead of a 2D item because of the new colors.

Advancements

• Added one advancement ("Adventuring Time"), added descriptions to 30 existing advancements and changed titles of most of them.
  • Advancements in this version include:

Minecraft
Icon	Advancement	In-game description	Parent	Actual requirements (if different)	Resource location	Rewards
	Minecraft	The heart and story of the game	—	Have a crafting table in the inventory.	story/root	—
	Stone Age	Mine stone with your new pickaxe	Minecraft	Have cobblestone in the inventory.	story/mine_stone	—
	Getting an Upgrade	Construct a better pickaxe	Stone Age	Have a stone pickaxe in the inventory.	story/upgrade_tools	—
	Acquire Hardware	Smelt an iron ingot	Getting an Upgrade	Have an iron ingot in the inventory.	story/smelt_iron	—
	Suit Up	Protect yourself with a piece of iron armor	Acquire Hardware	Have any piece of iron armor in the inventory.	story/obtain_armor	—
	Not Today, Thank You	Deflect an arrow with a shield	Suit Up	Block incoming damage from a projectile with a shield.	story/deflect_arrow	—
	Isn't It Iron Pick	Upgrade your pickaxe	Acquire Hardware	Have an iron pickaxe in the inventory.	story/iron_tools	—
	Diamonds!	Acquire diamonds	Isn't It Iron Pick	Have a diamond in the inventory.	story/mine_diamond	—
	Cover Me with Diamonds	Diamond armor saves lives	Diamonds!	Have any piece of diamond armor in the inventory.	story/shiny_gear	—
	Enchanter	Enchant an item at an Enchanting Table	Diamonds!	—	story/enchant_item	—
	Hot Stuff	Fill a bucket with lava	Acquire Hardware	Have a lava bucket in the inventory.	story/lava_bucket	—
	Ice Bucket Challenge	Form and mine a block of Obsidian	Hot Stuff	Have obsidian in the inventory.	story/form_obsidian	—
	We Need to Go Deeper	Build, light and enter a Nether Portal	Ice Bucket Challenge	Enter the nether portal block.	story/enter_the_nether	—
	Withering Heights	Summon the Wither	We Need to Go Deeper	—	story/summon_wither	—
	Bring Home the Beacon	Construct and place a Beacon	Withering Heights	Be near a beacon when it activates.	story/create_beacon	—
	Beaconator	Bring a beacon to full power	Bring Home the Beacon	Be near a 4-layer beacon when it activates.	story/create_full_beacon	—
	Into Fire	Relieve a Blaze of its rod	We Need to Go Deeper	Have a blaze rod in the inventory.	story/obtain_blaze_rod	—
	A Weak Brew	Brew up a potion of Weakness	Into Fire	Retrieve from a brewing stand either a potion of Weakness, a splash potion of Weakness, or a lingering potion of Weakness (neither can be an extended variant).	story/brew_weakness_potion	—
	Zombie Doctor	Cure a zombie villager.	A Weak Brew	The advancement is granted when the zombie villager converts into a villager.	story/cure_zombie_villager	—
	Eye Spy	Follow an Ender Eye	Into Fire	Use an eye of ender while being within 64 blocks of a stronghold.	story/follow_ender_eye	—
	The End?	Enter the End Portal	Eye Spy	Enter the End portal block.	story/enter_the_end	—
	Remote Getaway	Defeat the dragon and escape the island	The End?	Enter the End gateway block.	story/enter_end_gateway	—
	Sky's the Limit	Find an Elytra	Remote Getaway	Have an elytra in the inventory.	story/elytra	—

Adventure
Icon	Advancement	In-game description	Parent	Actual requirements (if different)	Resource location	Rewards
	Adventure	Adventure, exploration and combat.	—	Kill any entity, or be killed by any entity.	adventure/root	—
	Sweet Dreams	Change your respawn point	Adventure	Sleep in a bed.	adventure/sleep_in_bed	—
	Adventuring Time	Discover every biome	Sweet Dreams	Visit each of these biomes: birch_forest_hills river swampland desert forest_hills redwood_taiga_hills taiga_cold mesa forest stone_beach ice_flats taiga_hills ice_mountains mesa_rock savanna plains frozen_river redwood_taiga cold_beach deep_ocean jungle_hills jungle_edge ocean mushroom_island_shore extreme_hills desert_hills jungle beaches savanna_rock taiga_cold_hills mesa_clear_rock roofed_forest taiga birch_forest mushroom_island extreme_hills_with_trees	adventure/adventuring_time	—
	What a Deal!	Successfully trade with a Villager	Adventure	—	adventure/trade	—
	Monster Hunter	Kill any hostile monster	Adventure	Kill one of these 22 mobs: Blaze Cave Spider Creeper Enderman Evoker Ghast Guardian Husk Magma Cube Polar Bear Shulker Silverfish Skeleton Slime Spider Stray Vindicator Witch Wither Skeleton Zombie Zombie Pigman Zombie Villager	adventure/kill_a_mob	—
	Monsters Hunted	Kill one of every hostile monster	Monster Hunter	Kill each of the mobs mentioned above.	adventure/kill_all_mobs	—
	Take Aim	Shoot something with bow and arrow	Monster Hunter	Hit a mob with a shot arrow.	adventure/shoot_arrow	—
	Sniper duel	Kill a skeleton with an arrow from more than 50 meters	Take Aim	Kill any mob with a shot arrow from at least 50 blocks away.	adventure/sniper_duel	—

Narrator

• Added a toast notification for toggling the narrator.
• Added the option to toggle narrator between: "off", "chat & system", "chat only", and "system messages only".

Splashes

• Added "Don't feed chocolate to parrots!"

Stairs

• The rear face and underside of stairs are now considered "solid".
  • Allows for torches, fences, iron bars, glass panes, walls, and snow layers to connect to them properly.

Fences, walls, glass panes, and iron bars

• Now connect to stairs, buttons, signs, all types of rails, banners, string, redstone, pressure plates, levers, tripwire hooks, sticky pistons, and structure voids.

Wool

• Removed the recipe to craft white wool using bone meal and white wool.

Parrots

• No longer cycle through parrot colors when dancing.

Recipe books

• The icon in the pop-up notification now quickly cycles through all recipes that were unlocked.

43 issues fixed

From released versions before 1.12

• MC-2813 – Snow doesn't form / cannot be placed on upside down slabs / stairs
• MC-8345 – Placing torch on backside of stairs impossible
• MC-9176 – Glass panes not correctly rendering with the back of stairs
• MC-10613 – Fence doesn't connect with stairs
• MC-11963 – bed hind legs not rendered
• MC-109663 – Tamed dogs attack tamed cats

From the 1.12 development versions

• MC-114899 – Recipes removed on gamemode 2
• MC-114907 – Parrots in flight tend to spin around in circles rather than fly in a direction
• MC-114950 – Book crafting recipe doesn't exist in the newest snapshot
• MC-114961 – Multiplayer players get kicked on pickup first item for advancement
• MC-114974 – Clicking on crafting recipe in Spectator mode moves items to crafting grid
• MC-114991 – Crafting recipe list shows 1/0 pages when no recipes were unlocked
• MC-115025 – Clicking on recipe or on book to close crafting help additionally clicks in inventory
• MC-115048 – Parrots sitting on shoulders don't drown in water or burn in lava / Parrots shouldn't go diving
• MC-115050 – Statistics page never loads
• MC-115064 – Custom advancements in world folder use the "minecraft" namespace instead of folder name
• MC-115121 – Credits are not shown when leaving End for the first time but after that are always shown
• MC-115148 – F3 + T does not reload advancements but does reload loot tables
• MC-115157 – No advancements on server
• MC-115159 – Repeated key events are not enabled for crafting search
• MC-115182 – Parrots become invisible when on a players shoulder while player swims up.
• MC-115184 – Parrot imitations show up on subtitles as original sound
• MC-115221 – Certain blocks don't render correctly in crafter helper.
• MC-115277 – Your tamed wolf will attack your tamed parrot
• MC-115341 – Bug with the Narrator
• MC-115361 – doLimitedCrafting set to 'true' disables ability to combine used tools

From the previous development version

• MC-115423 – Duplicate bug in "Click and hold for more" menu + text message bug
• MC-115426 – Background doesn't become darker in most GUIs
• MC-115427 – Tool info not showing up in most GUIs
• MC-115436 – Item duplication using recipe book
• MC-115443 – 17w14a doLimitedCrafting(true) returns FATAL ERROR on servers when recipe should unlock
• MC-115444 – "Obtain Armor" and "Shiny Gear" advancement notification at each piece of armor.
• MC-115462 – Can craft "incomplete" recipe using alternate ingredients
• MC-115465 – Items can be dropped if you click while hovering over recipe interface
• MC-115466 – 17w14a doLimitedCrafting(true) Crafting Based duplication
• MC-115469 – Parrots do not appear dancing for other players
• MC-115470 – Parrots go to players' shoulders in spectator mode
• MC-115474 – Taken recipes are still available until player relogs
• MC-115481 – 17w14a STDOUT spam when hurting/killing mobs
• MC-115504 – Recipe book does not correctly render character
• MC-115508 – Parrots on your shoulder look darker if many items in your inventory
• MC-115530 – "Recipes unlocked" message only shows up when reloading the world.
• MC-115726 – Tool and armor duplication glitch with doLimitedCrafting set to true

• 17w15a was previously removed from the launcher for some time, but was added back in September 2018.