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{{Dangerous version|Game crashes when adding blocks to #copper_chests then placing it next to actual copper chests.<ref>{{Bug|MC-302094||Fixed}}</ref>
| type = crash
| edition = java
| version = development
}}
{{Infobox version
|title=Minecraft 25w37a
|image=25w37a.jpg
|image2=Java Edition 25w37a.png
|edition=Java
|type=Snapshot
|date=September 9, 2025
|jsonhash=a3b3ac6c93468a31e4a94f589d625f26e0305570
|clienthash=2d091382632a915e9dd1690b658fe025bd4533bf
|clientmap=23834bc959ea1cdb405ab147c01699c7ebe23676
|serverhash=9675164bd7a8ec5a876a05ac96637c77e9d82a24
|servermap=b5eb11bfa30cc782b5c8510691fe082afd6c1c22
|parent=1.21.9
|prevparent=1.21.8
|prev=25w36b
|next=1.21.9 Pre-Release 1
|nextparent=1.21.10
}}

<onlyinclude>

'''25w37a''' is the ninth and final [[Minecraft:snapshot]] for [[Minecraft:Java Edition 1.21.9]], released on September 9, 2025.<ref>{{snap|25w37a|id=a|September 9, 2025}}</ref>

== Additions ==
=== General ===
'''[[Minecraft:Game rule]]s'''
* Added <code>spawnerBlocksEnabled</code> game rule controlling if [[Minecraft:spawner]] blocks should be enabled or not.
** Default to <code>true</code>.

== 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%.

[[File:Copper Golem JE1 BE1.png|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:door]]s.

=== General ===
'''[[Minecraft:Data pack]]'''
* The [[Minecraft:pack format]] version is now {{cd|87.0}}.

'''[[Minecraft:Debug property|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 {{cd|-DMC_DEBUG_ENABLED}} or {{cd|1=-DMC_DEBUG_ENABLED=true}}.
** Then, a specific feature can be enabled, for example {{cd|-DMC_DEBUG_BRAIN}} or {{cd|1=-DMC_DEBUG_BRAIN=true}}.
** To get the list of all available debug properties, add {{cd|-DMC_DEBUG_PRINT_PROPERTIES}}.
* 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 ghast]]s, [[Minecraft:boat]]s...) 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 rule]]s'''
*<code>enableCommandBlocks</code> was renamed to <code>commandBlocksEnabled</code>, 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:skeleton]]s or [[Minecraft:skeleton horse]]s, the feet of [[Minecraft:chicken]]s or [[Minecraft:frog]]s, the wings of [[Minecraft:phantom]]s 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:
*** <code>management-server-secret=</code>
*** 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:
*** <code>management-server-tls-enabled=false</code>
** Requires a keystore file to be set in the server properties file.
*** <code>management-server-tls-keystore=path/to/keystore.p12</code>
** The keystore file must be in PKCS12 format.
** Keystore password can be set in the following ways, in order of priority.0
*** Environment variable: <code>MINECRAFT_MANAGEMENT_TLS_KEYSTORE_PASSWORD</code>
*** JVM argument: <code>-Dmanagement.tls.keystore.password=</code>
*** Server property: <code>management-server-tls-keystore-password=</code>

'''[[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 {{cd|69.0}}.

'''[[Minecraft:Server properties]]'''
* Default value of <code>management-server-port</code> was changed from <code>25585</code> to <code>0</code>, assigning an available port each time management server is started.
* Added server property <code>management-server-tls-enabled</code> controlling whether the Minecraft Server Management Protocol uses TLS or not.
** Defaults to <code>true</code>.
* Added server property <code>management-server-tls-keystore</code> 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 <code>management-server-tls-keystore-password</code> controlling the password to the keystore file used for TLS.
** Defaults to an empty string.

'''[[Minecraft:Shaders]]'''
* A new <code>PER_FACE_LIGHTING</code> flag has been added to the following shaders:
** <samp>core/entity.vsh</samp>
** <samp>core/entity.fsh</samp>
* 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 <code>150</code> to <code>330</code>.

'''[[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 <samp>gui/container/villager.png</samp> up by one pixel.

== Fixes ==
{{fixes|project=MC|fixedin=25w37a
|;From released versions before 1.21
|220913|Parity issue: Adjusting slider in the sound settings when not being in a world does not play a sound of that category.
|254052|{{cmd|locate}} doesn't work outside build limit.
|;From 1.21.5
|295841|Interactive collision check path is broken.
|;From 1.21.8
|301494|Falling particles no longer appear from floating sand or gravel.
|301510|GUI sprites nine slice performance regression.
|;dev
|300076|Copper golems remain completely stationary while searching chests, causing them to float and making them unable to receive knockback or be pushed.
|300299|Copper Golems can open chests that are blocked.
|300723|Second armor layer is still not rendering properly on all pieces.
|301294|Higher tiers of mob armor are unreasonably less common than they were before 25w31a.
|301506|Parity issue: Copper golems can't open doors.
|301531|Server Management Protocol returns wrong response for invalid method IDs.
|301547|Switching from Spectator mode to Creative mode now makes you fall out of the sky.
|301554|Management protocol doesn't support batched requests.
|301558|Copper golems can't pathfind through thin blocks.
|301563|When you have the darkness potion effect, the chat, letters and words in the pause menu, items, F3 will darken.
|301564|Management protocol doesn't support string-based request IDs.
|301574|The <code>spawnMonsters</code> game rule does not take effect when switched.
|301593|Monsters can spawn from spawners with the "<code>spawnMonsters</code>" game rule set to <code>false</code>.
|301599|Action key getting stuck on when entering an interface so you are unable to exit without it reopening instantly.
|301620|Banner animation is not independent when two banners are rendered.
|301661|Server Management Protocol prints some incorrectly formatted messages in the console.
|301711|The name of the "<code>enableCommandBlocks</code>" game rule is inconsistent with Bedrock Edition.
|301748|Striking a Lightning Rod with non-default oxidation level with Lightning keeps nearby redstone components powered.
|301751|The client crashes when in the vicinity of a mannequin spawner.
|301752|Mannequins with <code>profile.model</code> set to "<code>wide</code>" render as a Steve skin.
|301758|Shield model clips through shelves.
|301759|Elements within the realms “Worlds” tab are not selected in order when using the {{key|TAB}} key.
|;prev
|301766|Heads and skulls appear too high when placed on shelf.
|301768|Structure blocks frame is not displayed when in spectator mode.
|301785|Squid ink particles are yellow.
|301811|Loot from suspicious blocks does not render while brushing.
|301833|Text of <code>text_display</code> entities is darker when "<code>see_through</code>" property is set to <code>true</code>.
|301869|The specification for the <code>minecraft:ip_bans</code> server management method says it returns an array of players even though it returns an array of <code>ip_ban</code> objects.
|301870|Command feedback for successful {{cmd|ban}} and {{cmd|ban-ip}} commands with no specified reason can't be sent to the client.
|301889|Documented return type does not match for clear methods in server managment protocol.
|301891|Server management method <code>minecraft:bans/clear</code> clears allowlist, not bans.
|301899|The output slot in the trading GUI is misaligned with other slots.
|301903|Dropped chests, including variants, are no longer translated upward.
|301935|Chests render on the bottom of shelves even though other items don't.
|301952|Conduit visual bug.

|otherissuescount=1
}}</onlyinclude>
* Fixed a bug where breaking a shelf while another player is interacting with it could lead to visual bugs in the player inventory.

== Videos ==
{{slicedlime|Bu1O2wH0BCg}}

== References ==
{{reflist}}

== Navigation ==
{{Navbox Java Edition versions|1.2x}}

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Minecraft:Java Edition 25w37a - Revision history

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