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{{Infobox version
|title=Minecraft 21w03a
|image=21w03a.jpg
|image2=Java Edition 21w03a.png
|edition=Java
|type=Snapshot
|date=January 20, 2021
|clienthash=30d492744e5c282331958d2096cc8b39d8ec3145
|jsonhash=f3549b483a7662bce66846fb3d3faed82465e301
|serverhash=dbe81ef81e20e76b1458be822026887fef84c541
|clientmap=e2ce8c476d6e3412b5e580216c0b1a60069015e7
|servermap=76085b5daeff626db3f2b8d221a1e366b0fc1dd4
|parent=1.17
|prevparent=1.16.5
|prev=20w51a
|next=21w05a
|nextparent=1.17.1
}}<onlyinclude>

'''21w03a''' is the sixth snapshot for [[Minecraft:Java Edition 1.17]], released on January 20, 2021, which adds [[Minecraft:glow squid]], [[Minecraft:glow ink sac]]s, [[Minecraft:glow lichen]], [[Minecraft:glow item frame]]s, and fixes bugs.<ref>{{snap|21w03a|January 20, 2021}}</ref> This is the first snapshot released in 2021.

== Additions ==
=== Blocks ===
'''[[File:Glow Item Frame JE1 BE3.png|32px]] [[Minecraft:Glow item frame]]s'''
* Placeable entities which appear to glow.
* Do not affect the light level, only appearing as if lit up themselves.
* Items placed inside also glow.
* Crafted using an [[Minecraft:item frame]] and a glow ink sac.
* Includes application to [[Minecraft:map]]s.

'''[[File:Glow Lichen (texture) JE1.png|32px]] [[Minecraft:Glow lichen]]'''
* A naturally occurring light source found rarely in caves, growing on any face of a block.
* Has a light level of 7.
* Obtained with [[Minecraft:shears]], otherwise breaks.
* Does not spread naturally, although [[Minecraft:bone meal]] can be used to spread it.
** It spreads to adjacent spaces horizontally, up to 4.
* Can be waterlogged.
* Unlike [[Minecraft:vines]], it does not pop off when underwater, and is not climbable.
* Up to 6 can be put on the same block space, merging into one block.

=== Items ===
'''[[File:Glow Ink Sac JE1 BE1.png|32px]] [[Minecraft:Glow ink sac]]s'''
* Dropped by glow squid when killed.
* Can be used to craft glow item frames.
* Can be used to make text glow on [[Minecraft:sign]]s.

'''[[Minecraft:Spawn egg]]s'''
* [[File:Glow Squid Spawn Egg JE1 BE1.png|32px]] [[Minecraft:Glow squid spawn egg]]

=== Mobs ===
'''[[File:Glow Squid JE1.gif|32px]] [[Minecraft:Glow squid]]'''
* Originates from the mob with [[Minecraft:MCE:Glow Squid|the same name]] from ''[[Minecraft:Minecraft Earth]]''.
* Underwater mob that behaves like a regular [[Minecraft:squid]].
* Does not naturally spawn yet.
* Is attacked by [[Minecraft:axolotl]]s without provocation.
* Drops glow ink sacs when killed.
* Does not affect the light level, only appearing as if lit up itself.
* Stops glowing for a short time and swims away fast after taking damage.

== Changes ==
=== Blocks ===
'''[[Minecraft:Dripstone block]]s'''
* Can now be crafted from 4 [[Minecraft:pointed dripstone]].

'''[[Minecraft:Sign]]s'''
* Can now be tinted with glow ink sacs to make the text glow.
** Glowing signs do not affect the light level, only appearing as if the text itself is illuminated.
** A new <code>lit</code> [[Minecraft:block state]] had been added to indicate whether the sign text is lit up.
** Regular [[Minecraft:ink sac]]s can be used to remove the glowing effect.
** Now has sounds for being dyed.

=== Gameplay ===
'''[[Minecraft:Death messages]]'''
* Added unique death messages for dying from falling on a stalagmite.
** "<player> was impaled on a stalagmite" and "<player> was impaled on a stalagmite whilst fighting <entity>".
** Previously, this death would use the generic fall damage death messages.

'''[[Minecraft:Recipe book]]'''
* The [[Minecraft:chiseled polished blackstone]] crafting recipe is now unlocked by having a [[Minecraft:polished blackstone slab]], instead of polished blackstone.

'''[[Minecraft:Subtitle]]s'''
* Changed <code>Lava drips into cauldron</code> to <code>Lava drips into Cauldron</code>.
* Changed <code>Water drips into cauldron</code> to <code>Water drips into Cauldron</code>.
* Changed <code>Shulker bullet explodes</code> to <code>Shulker Bullet explodes</code>.
* Changed <code>Shulker bullet breaks</code> to <code>Shulker Bullet breaks</code>.

=== General ===
'''Block models'''
* Made the vines block model much simpler.

'''[[Minecraft:Server]]s'''
* Changed the error message for failing to connect to the authentication servers. Now says they are "not reachable" instead of "down for maintenance".

'''[[Minecraft:Tag]]s'''
* Added glow squid to the <code>axolotl_always_hostiles</code> entity type tag.

'''[[Minecraft:Obfuscation map]]'''
* Changed the license included in the obfuscation map.

'''World selection'''
* Added unique warnings for downgrading a world.

'''[[Minecraft:Language]]s'''
* Removed the following languages due to incomplete translations:
** Gothic
** Kabyle
** Maori
** Mohawk
** Nuk
** Ojibwe
** Talossan

'''[[Minecraft:Custom|Customized world]]'''
* World height/depth can now be adjusted to a max of Y=-2048 to Y=2031, mountain and cave generation scales accordingly similar to amplified world type.<ref>https://youtu.be/9WpkDr1gXq8</ref><ref>https://youtu.be/tH76tx-AnWI</ref>

== Fixes ==
{{fixes|fixedin=21w03a
|;old
|89087|Command block GUI takes a brief time to update (output bar shown when disabled, mode buttons in wrong state).
|89880|Spawner with weight <code>0</code> crashes the game.
|91522|Shulker rendering position desync and generates ghost shulker when destroying shulker-ridden boat or minecart.
|92349|Players cannot tempt animals with food while other players are closer to the animal.
|92867|Setting JSON text value to <code>null</code> throws exceptions and crashes.
|96322|Shulkers are unable to attack from boat.
|99098|Shulker open and close hitbox is not updated, when they ride boat, minecart or mobs.
|105344|Shulkers in boats and minecarts do not sit up if previousely attached to blocks sideways.
|108717|Shulkers cannot be pushed back.
|111196|Using a monster spawner to spawn shulkers spawns white shulkers.
|113177|Shulkers cannot be pushed inside non-solid blocks.
|119051|Random transparent line in shulker box GUI texture.
|121897|Gaps in an animation's used frames throws <code>ArrayIndexOutOfBoundsException</code>.
|131564|Models that have locked uv in blockstates ignore texture rotation.
|139265|Shulkers do not teleport correctly when going through a portal.
|156109|Turtles do not follow players in Creative mode holding seagrass.
|161334|Shulker boxes cannot be opened if next to a shulker mob.
|168900|Shulkers teleport with original dimension coordinates after passing through portals.
|174216|Shulkers riding a vehicle sometimes appear in the ground after reopening world.
|174876|Shulker spawn egg spawns shulker inside soul sand, snow layers, farmland, grass path and honey block.
|183067|Shulkers can push marker armor stands.
|183884|Shulkers are afraid of being next to another shulker.
|186172|Shulkers open into blocks when unable to teleport.
|190677|Shulkers are notaligned to the grid for a split second after being spawned in.
|193386|Shulkers spawned attached to the groud attaches themselves to a wall after another shulker is spawned.
|194089|Shulkers at some Y positions refuse to get a Peek value.
|200195|Boats do not try dismounting the player on land.
|202202|Servers are unable to prevent a player from dismounting a vehicle, causing a desync.
|203373|Shulker bullet subtitles are not capitalized correctly.
|203397|Ceiling vines rotate when other vines are placed in the same block space.
|208639|Chiseled Blackstone Recipe unlocks when you get polished blackstone, not polished blackstone slab.
|210791|Dropping an item on a shulker launches the item off.
|;dev
|203571|Right-clicking an empty bundle sometimes plays hand animation.
|204337|Bundle use stat never increases.
|205076|Game mode selection is ordered differently.
|206118|"type" in loot table number providers is not optional anymore.
|206510|Game crashes when trying to shift-click a chest into the inventory of a donkey whose chest is being removed.
|206550|<code>block.pointed_dripstone.drip_[liquid/cauldron]</code> has no subtitles.
|206923|Dripstone subtitles are not capitalized properly.
|207250|Dripstone caves biome name is not properly capitalized.
|207254|Dripstone caves generate merging dripstones in impossible ways.
|207293|Dripstone generated in dripstone caves can replace lava sources which looks weird.
|207335|Mobs cannot spawn in dripstone caves.
|207388|Issues with chunk rendering when height limit is large.
|207900|Summoning "dust" or "dust_color_transition" particles kicks nearby players when on a server.
|208336|"player" sub-predicate of "entity_properties" predicate only passes if game mode is specified.
|;previous
|208611|Shulker boxes and bundles duplicate items when destroyed by two fire blocks simultaneously.
|208666|Shulker boxes and bundles drop their items twice when thrown into a lava cauldron.
}}</onlyinclude>

== Videos ==
{{slicedlime|Oa_4h6hZ7Js|2nIV8von6QQ}}

== See also ==
* [[Minecraft:Bedrock Edition beta 1.16.210.59]]

== References ==
{{Reflist}}

== Navigation ==
{{Navbox Java Edition versions|1.1x}}

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Minecraft:Java Edition 21w03a - Revision history

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