Minecraft Wiki
Minecraft 17w43a
Java Edition 17w43a.png

Java Edition



Release date

October 25, 2017

Snapshot for



Client (.json)

Protocol version


Data version


17w43a[1] is the first snapshot released for Java Edition 1.13, adding the first features of what was then called "Technically Updated". Although this is the first snapshot of 1.13, no Update Aquatic features were implemented yet because at the time the Update Aquatic was set to be released as 1.14 instead of 1.13, and as such snapshots from 17w43a to 18w06a mainly add or modify commands.



Data packs
  • Like resource packs, but for loot tables, advancements, functions, and structures.
    • Used by placing them into the datapacks folder of a world.
  • Data packs are .zip files or folders with a pack.mcmeta in the root. See Tutorials/Creating a resource pack for more info.
  • Structures will load from (world)/generated/structures/(namespace)/(file).nbt before checking data packs.
    • However, this directory should not be used to distribute structures. Instead, move these files into data packs.
  • Reloadable using /reload.
  • Structure: pack.mcmeta, data folder containing a namespace folder determining the namespace of its contents.
    • A namespace should only contain the following symbols: 01​​234​5​6​78​9abcdefghijklmnopqrstuvwxyz-_.
    • Inside the namespace folder, there can be folders for functions, loot_tables, advancements and structures.
  • FS (Fullscreen) Resolution
    • Is used to change the resolution.



  • The name of keybindings now describes the actual key (e.g. 'LBUTTON' is changed to 'Left Button' and 'BACKSLASH' is changed to '\').
  • Removed 3D Anaglyph completely.
  • Game library updates
    • Upgraded to LWJGL 3.1.2
  • Loading or creating a world shows the percentages of the loading stages.
    • Preparing spawn area now shows as a loading stage.
Resource packs
  • The default resource pack can now be moved up and down, just like other resource packs.


31 issues fixed
LWJGL 2-related issues
  • MC-1519 – Key gets stuck when toggling fullscreen.
  • MC-3643 – CTRL/CMD key get stuck on OS X/Text box backspace deletes whole word or whole line on Mac and Linux.
  • MC-5520 – Crash when toggling fullscreen mode: Keyboard must be created before the player can read events.
  • MC-6436 – Incomplete support of dead keys on non-U.S. QWERTY Keyboard on OS X.
  • MC-9974 – Initialization of OpenAL fails sometimes.
  • MC-29501 – Unable to rebind to F# keys on devices that require pressing FN.
  • MC-32327 – Half-resolution on MBP Retina.
  • MC-40227 – Mouse button 4 in combination with a modifier key is detected as mouse button 5.
  • MC-49755 – OS X: Pressing arrow or Fn keys in sign/command block/book and quill inserts invisible characters.
  • MC-53549 – Minecraft can't be put in fullscreen mode in Linux.
  • MC-55506 – Minecraft unloads monitor calibrations when closed.
  • MC-68754 – Exiting fullscreen disables window resize.
  • MC-71279 – Accentuated character act like sticky keys for moving.
  • MC-72856 – Control settings use partwise US keyboard layout (on German keyboard layout).
  • MC-77279 – Game sets monitor to half resolution on exit on Linux.
  • MC-78394 – "Use Item" not working while sneaking and "Use Item" bound to NUMPAD0.
  • MC-79733 – Alt combinations don't work on chat.
  • MC-80282 – On Linux in fullscreen, character sometimes cannot fully turn around.
  • MC-81818 – When resizing the window, players may end up spinning around.
  • MC-89288 – Can't sneak and jump if the jump key is on the numpad.
  • MC-100556 – "Alt Gr" on keyboard becomes "LCONTROL" in controls menu (interfering with "Ctrl").
  • MC-106650 – Minecraft does not release mouse focus.
  • MC-109376 – Unsupported keys in inventory with foreign keyboard on Linux.
  • MC-120989 – Screen goes blank on exit.
  • MC-122740 – In full-screen mode, the mouse cannot leave the window/screen on a multi-monitor setup.
From released versions before 1.13
  • MC-31222 – Crash on pressing the inventory close key and an item manipulation key at the same time in large chests.
  • MC-55751 – Gamemode descriptions are off-center.
  • MC-90265 – UI accounts for significant FPS reduction.
  • MC-111288 – Opening a singleplayer world shows 0% for a short moment.
  • MC-112992 – Right clicking a command block minecart opens GUI and uses held item.
  • MC-117705 – Cannot click in Creative search bar to change cursor position.


Video made by slicedlime:



  1. "Minecraft Snapshot 17w43a" – Minecraft.net, October 25, 2017