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	'''[[File:Lightning Rod (U) JE1.png\|32px]] [[Minecraft:Lightning rod]]'''		'''[[File:Lightning Rod (U) JE1.png\|32px]] [[Minecraft:Lightning rod]]'''
	* Can be crafted with 3 copper ingots.		* Can be crafted with 3 copper ingots.
	* Nearby lightning strikes within a 16 block radius get redirected to the lightning rod.		* Nearby lightning strikes within a 64 block radius get redirected to the lightning rod.
	* Gives off a redstone signal with a strength of 15 if hit by lightning.		* Gives off a redstone signal with a strength of 15 if hit by lightning.
	* Can be activated directly by throwing a trident with Channeling at it during a [[Minecraft:thunderstorm]], though this does not produce a redstone signal.		* Can be activated directly by throwing a trident with Channeling at it during a [[Minecraft:thunderstorm]], though this does not produce a redstone signal.

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{{Infobox version
|title=Minecraft 20w45a
|image=20w45a.png
|image2=Java Edition 20w45a.png
|edition=Java
|type=Snapshot
|date=November 4, 2020
|clienthash=cf2cd62dfc63fc1a79061a3964d82bf26e0fd208
|jsonhash=61d57da4d2ac5833d19feab0d3a286237ca496dc
|serverhash=043ec38297d0ec58abd6f636bc92f5664a8ccecb
|clientmap=ce69af77a39c4e1802b1aebac2f86d867bd71c5c
|servermap=e13520140ed6bdbe2ca05f59ce12700e9081a8cf
|parent=1.17
|prevparent=1.16.5
|next=20w46a
|nextparent=1.17.1
}}<onlyinclude>

'''20w45a''' is the first [[Minecraft:snapshot]] for [[Minecraft:Java Edition 1.17]], released on November 4, 2020,<ref>{{snap|20w45a|November 4, 2020}}</ref> which adds the first [[Minecraft:Caves & Cliffs]] features.

== Additions ==
=== Blocks ===
'''{{Animate|Small Amethyst Bud (U) JE1.png; Medium Amethyst Bud (U) JE1.png; Large Amethyst Bud (U) JE1.png|32px}} [[Minecraft:Amethyst bud]]'''
* Grows from [[Minecraft:budding amethyst]], which is found in amethyst geodes.
* Starts out small, but grows into medium after a while, large after even more time and eventually becomes an [[Minecraft:amethyst cluster]].
* Unlike crops, each growth stage is a separate block instead of a block state.
* Drops nothing if broken in its premature stages, even with Silk Touch.

'''[[File:Amethyst Cluster (U) JE1.png|32px]] [[Minecraft:Amethyst cluster]]'''
* The final, mature stage of the amethyst bud, which grows from budding amethyst in amethyst geodes.
* Drops amethyst shards if broken, in an amount affected by Fortune, but can also be picked up with Silk Touch.
* Emits a light level of 5.

'''[[File:Block of Amethyst JE1.png|32px]] [[Minecraft:Block of amethyst]]'''
* A block found in amethyst geodes.
* Unlike the budding amethyst, the block of amethyst can be obtained when mined.
* Can also be crafted with 4 amethyst shards.

'''[[File:Budding Amethyst JE1.png|32px]] [[Minecraft:Budding amethyst]]'''
* Generates amethyst crystals on any of its sides (if next to a water source block or air, and if the side is not against another block), in a given time.
* Cannot be obtained when mined, even with Silk Touch, and does not drop anything.
* Breaks immediately if pushed by a [[Minecraft:piston]] or sticky piston.
** Cannot be pulled by sticky pistons.
* Generates in amethyst geodes.

'''[[File:Calcite JE1.png|32px]] [[Minecraft:Calcite]]'''
* An off-white stone that generates in geodes, between [[Minecraft:tuff]] and [[Minecraft:Block of Amethyst|amethyst]].

'''{{Animate|Candle JE1 BE1.png; White Candle.png; Light Gray Candle.png; Gray Candle.png; Black Candle.png; Brown Candle.png; Red Candle.png; Orange Candle.png; Yellow Candle.png; Lime Candle.png; Green Candle.png; Cyan Candle.png; Light Blue Candle.png; Blue Candle.png; Purple Candle.png; Magenta Candle.png; Pink Candle.png|32px}} [[Minecraft:Candle]]s'''
* Crafted with [[Minecraft:honeycomb]] and [[Minecraft:string]].
* Come with 16 dyed types and a yellowish non-dyed type.
* Can be lit by any item that produces fire.
* Up to 4 can be placed in a single block, similar to [[Minecraft:sea pickle]]s, for a maximum light level of 12.
** Only candles of the same color can be placed on the same block.
* Only one can be placed on an uneaten cake and lit.
** If any of the cake is consumed the candle pops off.
* Can be placed, but cannot be lit, underwater.

'''{{Animate|Copper Block JE1 BE1.png|32px}} [[Minecraft:Copper block]]'''
* Can be crafted with 9 copper ingots, and can also be crafted back into 9 copper ingots.
* Oxidizes and changes texture to a turquoise-green over time.
* Can be stopped from oxidizing by combining it with a honeycomb to create a waxed copper block.
* Can be crafted into cut copper.

'''{{Animate|Copper Ore JE1 BE1.png|32px}} [[Minecraft:Copper ore]]'''
* Generates randomly underground in small blobs, but this has been confirmed to be a placeholder.
* Has the same rarity as iron.
* Generating starts at the same minimum level(s) as iron.
* Can be smelted into a copper ingot.

'''{{Animate|Cut Copper JE1.png|32px}} [[Minecraft:Cut copper]]'''
* Can be made into stair and slab variants.
* Oxidizes and changes texture over time.
* Can be stopped from oxidizing by combining it with a honeycomb to create waxed cut copper.

'''{{Animate|Cut Copper Slab JE1.png|32px}} [[Minecraft:Cut copper slab]]'''
* Oxidizes and changes texture over time.
* Can be stopped from oxidizing by combining it with a honeycomb to create a waxed cut copper slab.

'''{{Animate|Cut Copper Stairs (N) JE1.png|32px}} [[Minecraft:Cut copper stairs]]'''
* Oxidizes and changes texture over time.
* Can be stopped from oxidizing by combining it with a honeycomb to create waxed cut copper stairs.

'''[[File:Lightning Rod (U) JE1.png|32px]] [[Minecraft:Lightning rod]]'''
* Can be crafted with 3 copper ingots.
* Nearby lightning strikes within a 16 block radius get redirected to the lightning rod.
* Gives off a redstone signal with a strength of 15 if hit by lightning.
* Can be activated directly by throwing a trident with Channeling at it during a [[Minecraft:thunderstorm]], though this does not produce a redstone signal.

'''[[File:Tinted Glass JE1.png|32px]] [[Minecraft:Tinted glass]]'''
* A black variant of glass that does not let light pass through.
* Can be crafted with 4 amethyst shards and a glass block.
** Stained glass cannot be used to craft tinted glass.
* Drops itself if mined without [[Minecraft:Silk Touch]] or even by hand, unlike [[Minecraft:glass]].

'''[[File:Tuff.png|32px]] [[Minecraft:Tuff]]'''
* A grayish stone that composes the outer layer of amethyst geodes.

=== Items ===
'''[[File:Amethyst Shard JE1.png|32px]] [[Minecraft:Amethyst shard]]'''
* Obtained from breaking amethyst clusters.
* The amount dropped can be increased with the [[Minecraft:Fortune]] enchantment.
* Can be used to craft tinted glass, blocks of amethyst and a spyglass.

'''[[File:Bundle JE1.png|width=32x32]] [[Minecraft:Bundle]]'''
* Crafted with 2 [[Minecraft:string]] and 6 [[Minecraft:rabbit hide]].
* Used to store other items (except [[Minecraft:shulker box]]es) inside of it.
* Is able to hold different types of items inside of it.
** Holds the equivalent of one single stack of items.
*** Items with smaller stacks, such as [[Minecraft:ender pearl]]s, take up more room in a bundle, and non-stackable items take up the whole bundle.
* The bundle's contents can be opened by pressing {{ctrl|use}} while holding it.

'''[[File:Copper Ingot JE1.png|32px]] [[Minecraft:Copper ingot]]'''
* Obtained by smelting copper ore.
* Used to craft copper blocks, lightning rods and spyglasses.

'''[[File:Spyglass JE1.png|32px]] [[Minecraft:Spyglass]]'''
* Crafted with 2 copper ingots and an amethyst shard.
* When used, it zooms in on wherever the player is looking, but limits their view to a small circle. [[File:Spyglass scope JE1.png|32px]]
** The overlay that limits the view can be removed with a [[Minecraft:resource pack]] or by pressing {{key|F1}}.
* There is a unique animation for using the spyglass, which is visible in third person perspective.

=== World generation ===
'''[[File:Amethyst Geode JE1.png|32px]] [[Minecraft:Amethyst geode]]s'''
* A new feature found uncommonly underground (can rarely appear exposed to the surface close to sea level).
* Contains blocks of amethyst and budding amethyst blocks, which are encased in a shell of calcite and tuff.
** Also generates with a small air pocket nearby which may open into the geode.
* Generally generates at or below sea level. (Y=63)
* Most commonly generates at lower levels. (Y=0 to Y=40)
* Overrides standard caves and canyons, but is overridden by mineshafts.
* Currently has a high generation rate, presumably for testing purposes which was also done with [[Minecraft:ruined portal]]s before.

=== General ===
'''Loot tables'''
* New functions: <code>set_banner_pattern</code>
** Sets tags needed for banner patterns. Parameters:
*** <code>patterns</code> – list of pattern objects:
**** <code>pattern</code> – name of pattern (<code>square_bottom_left</code>, <code>bricks</code>, etc.)
**** <code>color</code> – name of color (<code>light_gray</code>, etc.)
*** <code>append</code> – if <code>true</code>, new elements are appended to existing ones instead of replacing.

'''[[Minecraft:Tag]]s'''
* Added the <code>candle_cakes</code> block tag.
** Contains all 17 types of candle cake.
** If the player puts a candle on a cake, and keeps clicking the candle on the cake, the candle is duplicated.
** Blocks in this tag are considered candle cakes and can be lit, if they have the <code>lit</code> block states set to false.
* Added the <code>candles</code> block and item tags.
** Contains all 17 types of candles.
** Blocks in this tag are considered candles and can be lit, if they have the <code>lit</code> and <code>waterlogged</code> block states and both are false.
** Cakes use this tag to determine if a candle item can be placed on it or not.
* Added the <code>cauldrons</code> block tag.
** Contains cauldrons, water cauldrons, and lava cauldrons.
** This tag is used in certain pathfinding processes.
* Added the <code>crystal_sound_blocks</code> block tag.
** Contains amethyst blocks and budding amethyst.
** Blocks in this tag play the "amethyst block chime" sound repeatedly for a short amount of time after being stepped on, gradually decreasing in volume.
* Added the <code>ignored_by_piglin_babies</code> item tag.
** Contains leather.
** Baby piglins do not attempt to pick up items in this tag. Adult piglins are unaffected. Baby piglins still follow the other rules adult piglins follow.
*** If an item is in this tag while simultaneously being recognized as a wanted item by piglins, this tag takes precedence.
* Added the <code>piglin_food</code> item tag.
** Contains raw and cooked porkchop.
** Piglins can eat items in this tag.
*** Eating refers to the piglin seeking out and picking up an item without appearing in its inventory, thus vanishing.

== Changes ==
=== Blocks ===
'''[[Minecraft:Cauldron]]s'''
* Can now be filled with lava.
** Lava filled cauldrons can damage players and mobs inside of it.
** Lava filled cauldrons give off a [[Minecraft:redstone comparator]] signal of strength 1.
* Have been split into normal, water and lava cauldrons.

'''[[Minecraft:Grass path]]'''
* Renamed to "Dirt Path", as per {{BE}}.
** The block ID has also been changed to <code>dirt_path</code>.
* Can now be made with dirt, coarse dirt, mycelium, and podzol.

'''[[Minecraft:Piston]]s'''
* Particles now appear if a block is broken by a piston.
** Sounds, however, do not.<ref>{{bug|MC-203550}}</ref>

'''All [[Minecraft:rail]]s'''
* Are now able to be waterlogged.
* No longer break when contacted by water.

'''[[Minecraft:Water]] '''
* Flowing water no longer breaks rails.

'''[[Minecraft:Shulker box]]es'''
* Now mimics the opening and closing of a [[Minecraft:shulker]].
** Unlike its mob counterpart, it does not elevate the [[Minecraft:player]] when they are standing on it.

'''[[Minecraft:Cake]]s'''
* Have a variation called "Candle Cake".
** Can be created by using a candle on an uneaten cake.
** The candle on the cake comes with 17 colors, depending on the color of the candle used to create it.
** Pop out the original candle when any of the cake is eaten.

=== Items ===
'''[[Minecraft:Firework rocket]]s'''
* Simple firework rockets with one gunpowder can now be crafted using the recipe book.

=== Mobs ===
'''[[Minecraft:Shulker]]s'''
* If a shulker is hit by another shulker's projectile, it now has a chance of spawning a new shulker.
** Shulkers are more likely to spawn new shulkers when there are fewer other shulkers nearby.

=== Non-mob entities ===
'''[[Minecraft:Experience orb]]s'''
* Now sometimes merge when in large quantities, to improve performance.
** Merging does not affect the amount of experience gathered from collecting the merged orbs.
* No longer follow dead players.

'''[[Minecraft:Minecart]]s'''
* Can now move in water, but move considerably slower than they do on land.

=== General ===
'''[[Minecraft:Data Pack|Data]] and [[Minecraft:resource pack]]s'''
* Changed the resource pack version number from 6 to 7, as the following have been changed:
** [[Minecraft:Drowned]] texture mirroring has changed.<ref>{{bug|MC-174685}}</ref>
** Slots for the game mode selector are now 26 pixels instead of 25.
* Split the <code>pack_version</code> number into separate resource and data pack versions; the data pack version remains at 6.

'''Dedicated [[Minecraft:server]]s'''
* A dedicated server can enforce custom resource packs by setting <code>require-resource-pack</code> in <code>server.properties</code>. When this option is used, players are prompted for a response and are disconnected if they decline the required pack.

'''Entity storage'''
* Entities have been extracted from main (terrain) chunks and are now stored in separate <code>entities</code> directory (similar to POI storage). Those new files are still region files with NBT.

'''Libraries'''
* The game now uses javabridge 1.1.23 instead of 1.0.22.

== Fixes ==
{{Fixes|fixedin=20w45a
|;old
|98219|Experience orbs follow dead players.
|108469|Chunk-wise entity lists often don't get updated correctly (entities disappear).
|112147|Lava burning items or XP orbs sound muted when "Friendly Creatures" slider is turned off.
|126997|Undyed shulker box still uses cauldron's water when right clicking.
|127201|{{cmd|replaceitem}} makes quite an obnoxious sound, which is not heard by the person whose items are being replaced.
|127692|Experience build up in furnace when using a hopper which can cause severe lag.
|130449|Cartographer villager freezes or crashes the game when unlocking explorer maps.
|130584|When a structure loads, water sources in the structure spread into waterloggable blocks.
|133691|Blocks cannot be placed normally on a full cauldron.
|135552|Dead entities are saved to chunk.
|136497|XP orbs causing severe lag.
|141034|<code>taiga_fisher_cottage_1</code> is filled with water.
|143732|Undead mobs that are halfway in sand blocks dont burn in daylight.
|151270|Teleporting an entity from another dimension can cause UUID duplication in entity sections.
|160994|Blocks broken by pistons do not display breaking particles.
|161592|Entities lose their scores when switching dimensions.
|168398|Guardian beam is darker.
|169900|Incorrect jigsaw setting in <code>snowy_small_house_8</code>.
|169945|Skeletons do not burn in minecarts while being exposed to daylight.
|170653|Fireworks fired from a dispenser get stuck in the air when removing the block they crashed into.
|171852|Putting item in a spectator's hand plays sound "Gear equips" for other players.
|174685|Drowned arm texture is reversed by the model.
|175959|One door is open in <code>taiga_shepherds_house_1</code>.
|177539|When flattening a grass block into a path immediately after the grass block grows from dirt, the shovel sound doesn't play.
|177622|One log in <code>taiga_butcher_shop_1</code> seems to be misrotated - causing the side roof to look asymmetrical.
|177624|Entrance in <code>snowy_medium_house_2</code> is asymmetrical.
|181889|Equipping sound plays when mobs picking up non-armor items.
|185357|Removing a plant from a flower pot still plays generic armor equipping sound/shows Gear equips in subtitles.
|185359|Using a bucket in Survival mode still plays generic armor equipping sound/shows Gear equips in subtitles.
|185360|Milking a mooshroom for stew still plays armor equip sound/shows Gear equips subtitle.
|188044|Using a banner on a filled cauldron plays hand animation.
|189565|Some entities do not render inside of spawners and producing error log spam in console, potentially causing lag.
|190896|Lag when opening a shipwreck chest containing buried treasure map.
|192594|<code>plains_stable_1</code> misplaced blocks.
|192629|<code>plains_stable_2</code> misplaced blocks.
|192876|Misplaced trapdoor on <code>taiga_decoration_6</code>.
|192879|Wall incorrectly placed on certain taiga houses.
|192930|Zombies picking up items play the gear equipping sound and subtitle.
|193071|Eating food items that return empty containers still play gear equipping sound.
|194685|Collecting water from cauldrons with glass bottles in Creative mode is still inconsistent.
|194686|Collecting water from cauldrons with buckets in Creative mode is still inconsistent.
|195125|<code>plains_animal_pen_1</code> misplaced block.
|195126|<code>plains_animal_pen_3</code> misplaced blocks.
|195351|Comparator in compare mode can schedule unneeded tileticks.
|196542|Small cleanup for skylight propagation code.
|196638|Placing an armor stand logs warning "Trying to add entity with duplicated UUID".
|197009|Referencing empty item tag in recipe can crash client.
|197140|Jack o'lantern does not come after carved pumpkin in Creative inventory.
|197179|Baby piglins that pick up leather do not despawn, cluttering the Nether with unnecessary baby piglins.
|197524|Border chunks do not enforce neighbors to be loaded, causing light updates to get stuck.
|198129|<code>ReplaceBlobsFeature</code> changed from 1.16.1 to 1.16.2, affecting Basalt Delta generation.
|198414|If the angle in {{cmd|spawnpoint}} is set to ±infinity, and the player dies, it will kick the player, and upon rejoin will crash the game.
|198807|Making piglins and piglin brutes angry at certain entities (like dropped items) crashes the game.
|202246|Drowned navigation causes memory leak/performance degredation.
}}</onlyinclude>

== Videos ==
{{slicedlime|CFDZ2VBEHGk}}

== References ==
{{Reflist}}

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

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