Minecraft:Java Edition 25w37a

25w37a is the ninth and final Minecraft:snapshot for Minecraft:Java Edition 1.21.9, released on September 9, 2025.<ref>Template:Snap</ref>

Additions

General

Minecraft:Game rules

• Added spawnerBlocksEnabled game rule controlling if Minecraft:spawner blocks should be enabled or not.
  • Default to true.

Changes

Blocks

Minecraft:Test instance block

• Test instance blocks now preserve error markers between world reloads.

Mobs

General

• Logic for choosing type of equipment for Minecraft:geared mobs has been tweaked to add Minecraft:copper as a possibility.
  • The initial roll to choose a type now chooses between Minecraft:leather, Minecraft:copper and Minecraft:gold.
  • The chance to increase an armor tier has increased from 9.5% to 10.87%.

width=43x43 Minecraft:Copper golem

• The hitbox has been tweaked.
  • The hitbox is now 0.49 blocks in width to be able to pathfind through narrow spaces.
• Can now open Minecraft:doors.

General

Minecraft:Data pack

• The Minecraft:pack format version is now Template:Cd.

Debug features

• Some debug features that were previously removed during compilation are now preserved and can be used by players.
• Individual values can be enabled with JVM properties:
  • First, a global debug flag must be enabled with Template:Cd or Template:Cd.
  • Then, a specific feature can be enabled, for example Template:Cd or Template:Cd.
  • To get the list of all available debug properties, add Template:Cd.
• Warning: this is debug code. It must be handled with extreme care.
  • This is an advanced feature, meant to help modders - it should not be used for normal play.
  • Features not guaranteed to work as intended.
  • It might crash the player's game or corrupt their worlds.
  • Individual options might be added, changed or removed without a notice.

Game library updates

• Rendering is now using OpenGL 3.3 core profile.

Minecraft:Game mode switcher

• Switching from Minecraft:Spectator mode to Minecraft:Creative mode no longer causes the player to stop flying.
  • Instead, flight now only gets disabled when switching game modes if the player is near the ground.
    • A player is considered to be near the ground if there is a collidable surface (i.e. blocks, Minecraft:happy ghasts, Minecraft:boats...) within 1 block below them.
  • Flight will not get disabled if the player was inside a block or collidable entity.
    • This is to prevent players from suddenly falling through the ground.

Minecraft:Game rules

• enableCommandBlocks was renamed to commandBlocksEnabled, to match Bedrock Edition.

Minecraft:Light

• Ambient lighting on entities has been adjusted to be more visually in line with blocks and other parts of the game.
  • The underside of flat surfaces will now be lit from that direction, instead of the opposite direction.
  • This mainly affects models containing cubes that are either flat or "hollow" such as: worn Minecraft:armor, worn Minecraft:elytra, the outside layers on player skins, the ribcages of Minecraft:skeletons or Minecraft:skeleton horses, the feet of Minecraft:chickens or Minecraft:frogs, the wings of Minecraft:phantoms or the Minecraft:ender dragon, the fins on Minecraft:fish, and more.

Minecraft:Minecraft Server Management Protocol

• Clients must authenticate to access the API.
  • Clients should supply an Authorization bearer token header with a server specific secret.
  • The secret is configured in the server properties file:
    • management-server-secret=
    • The secret should be exactly 40 alphanumeric characters (A-Z, a-z, 0-9).
    • The secret will be automatically generated if the server property is empty.
    • Unauthorized requests are rejected with 401 Unauthorized.
• TLS is enabled by default.
  • Can be disabled in the server properties file:
    • management-server-tls-enabled=false
  • Requires a keystore file to be set in the server properties file.
    • management-server-tls-keystore=path/to/keystore.p12
  • The keystore file must be in PKCS12 format.
  • Keystore password can be set in the following ways, in order of priority.0
    • Environment variable: MINECRAFT_MANAGEMENT_TLS_KEYSTORE_PASSWORD
    • JVM argument: -Dmanagement.tls.keystore.password=
    • Server property: management-server-tls-keystore-password=

Minecraft:Options

• Some sound sliders in the Music & Sound options now play a preview sound when adjusting the setting outside a world.
• The Resource Pack and Data Pack selection screens now have a search box.

Minecraft:Resource pack

• The version is now Template:Cd.

Minecraft:Server properties

• Default value of management-server-port was changed from 25585 to 0, assigning an available port each time management server is started.
• Added server property management-server-tls-enabled controlling whether the Minecraft Server Management Protocol uses TLS or not.
  • Defaults to true.
• Added server property management-server-tls-keystore controlling the path to the keystore file used for TLS.
  • Defaults to an empty string.
  • A dedicated server won't start when TLS is enabled and no keystore is provided.
• Added server property management-server-tls-keystore-password controlling the password to the keystore file used for TLS.
  • Defaults to an empty string.

Minecraft:Shaders

• A new PER_FACE_LIGHTING flag has been added to the following shaders:
  • core/entity.vsh
  • core/entity.fsh
• When set, cardinal lighting will be computed separately for front- and back-faces.
• As the game now requires OpenGL 3.3, the version of all shaders are bumped from 150 to 330.

Minecraft:Splashes

• Changed the splash "Now on OpenGL 3.2 core profile!" to "Now on OpenGL 3.3 core profile!"

Minecraft:Textures

• Moved the result slot of gui/container/villager.png up by one pixel.

Fixes

• Fixed a bug where breaking a shelf while another player is interacting with it could lead to visual bugs in the player inventory.