Java Edition 16w20a

This page covers a development version that has a major issue under certain conditions.

 

The dedicated server for this version has a security vulnerability in the Log4j library that could be used to perform a remote code execution exploit. It can be addressed by appending a certain JVM argument to the server startup command line.^[1]

Minecraft 16w20a

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16w20a is the first snapshot for Java Edition 1.10, released on May 18, 2016,^[2] which adds bone, magma, and Nether wart blocks; husks and strays as zombie and skeleton variants, respectively; polar bears; and fossils that spawn underground.

Bone blocks

• Crafted by filling a 3×3 square in the crafting table with bone meal.
  • Can be crafted back into 9 bone meal.
• Found underground in desert and swamps as part of fossils.

Magma blocks

• Found in the Nether, generating 4 blobs per chunk between Y=27 and Y=36.
  • It has a similar frequency to blocks like andesite in the Overworld.
• Crafted using four magma cream.
• Mobs and players take 1HP damage every second while touching it, similar to a cactus.
  • Unlike cactus or fire, this block doesn't destroy items that touch it.
• If the player is sneaking, wearing Frost Walker–enchanted armor, or under the Fire Resistance effect, it does not take damage.
• If the player dies by standing on it, a new death message appears: "player discovered that floor was lava".
  • If the player dies by the block, but after being damaged by a mob or player, the death message is: "player walked into danger zone due to entity".
• Removes water blocks on top when randomly ticked.
• It produces smoke particles under the rain.
• It emits as much light as it receives from other sources.
  • e.g. A magma block next to a torch emits light at level 13, as that was the light level it received from the torch.
    • If the torch is removed, magma block searches for the next brightest source of light; if no source is found then it doesn't produce light.

Nether wart blocks

• Crafted by filling a 3×3 square in the crafting table with Nether wart.
  • It cannot be crafted back into Nether wart.
• It is broken by flowing water or lava, like most plants are.

Red Nether bricks

• Crafted by placing a 2×2 checkerboard of 2 Nether brick and 2 Nether wart.

Structure voids

• Used for the structure block to keep the blocks in that location.
  • Intended to be a replacement for the function barrier blocks used to convey, so they can form part of the structure itself.
• They are invisible and have a small hitbox.
  • They are only visible when using the feature in (save) structure void.
• Allows for empty spaces in a structure.
  • Unlike air, it doesn't overwrite blocks where it is loaded.
  • Example: If the player loads a 2-block-high structure with air at the top and a structure void at the bottom into a 2-block-high area of stone, the top block becomes air but the bottom stays stone.

Spawn eggs

• Cat spawn egg
• Donkey spawn egg
• Elder guardian spawn egg
• Husk spawn egg
• Mule spawn egg
• Polar bear spawn egg
• Skeleton horse spawn egg
• Stray spawn egg
• Wither skeleton spawn egg
• Zombie horse spawn egg

Husks

• 80% of zombies spawned above ground in desert biomes, and their variants, are husks.
  • All spawns where the zombie does not have a view of the sky are normal zombies or zombie villagers.
• Behaves mostly like a regular zombie.
• Its ZombieType tag is 6.
• Does not burn in sunlight.
• Can spawn as a baby or as a chicken jockey.
• Applies 7 seconds of Hunger when attacking in Easy, 14 in Normal, and 21 in Hard difficulty.
• Visually 2 pixels taller than zombies, but has the same hitbox.

Polar bears

• Adults and cubs spawn randomly as passive mobs in ice plains, ice mountains, and ice plains spikes.
• When hit, the adults attack the player, the cubs run away (very fast, similar to baby zombies).
  • Additionally, adults always attack the player when their cubs are around.
• Can swim faster in water than the player.
• Cubs follow their parents.
• Drops 0–2 raw fish (75% chance) or 0–2 salmon (25% chance), each increased by 1 per level of Looting.

Stray

• 80% of skeletons spawned above ground in ice plains biomes, and their variants, are strays.
  • All spawns where the skeleton does not have a view of the sky are normal skeletons.
  • Spiders spawned in cold biomes have a chance of having a stray riding it.
• Acts mostly like a regular skeleton.
• Its SkeletonType tag is 2.
• Drops are the same as skeletons, but also have a 50% chance to drop 0-1 tipped arrow of Slowness when killed by the player. With Looting, chance increases to ^2×level+1⁄_2×level+2.
• Shoots tipped arrows of Slowness (0:30) at the target.

Fossil

• Generates 15–24 blocks underground in deserts, swamplands, and their variants. Each chunk has a ¹⁄₆₄ chance of generating a fossil.
• Composed of bone blocks and some coal ore, arranged as to resemble the skulls and spines of giant extinct creatures.
  • There are 4 variants of the skull, and 4 variants of the spine sections.

NBT format

• [Int] ZombieType: Determines the kind of zombie a specific zombie is.
  • 0: default, 1-5: villager, 6: husk.
  • This tag, in effect, unifies the characteristics of being a zombie, a specific zombie villager and a husk into a single variable.
  • Intended to replace the [Byte] IsVillager and [Int] VillagerProfession tags.
    • These tags are kept for backward compatibility, but no newly generated entities have them.

Sound events

• Added block.enchantment_table.use.
• Added entity.polar_bear.ambient.
• Added entity.polar_bear.baby_ambient.
• Added entity.polar_bear.death.
• Added entity.polar_bear.hurt.
• Added entity.polar_bear.step.
• Added entity.polar_bear.warning.

Debug screen

• F3 + G toggles the visibility of chunk borders around the player.
  • Shows a blue outline for the chunk the player is currently in and a yellow outline for individual air blocks in the vicinity of the chunk.
    • The blue outline in particular, outlines the chunk horizontally on top of the solid blocks on the ground.
    • The outlines extends arbitrarily up, but ends at bedrock level.

Loot tables

• A new tag limit for the looting_enchant function.
  • It determines the maximum amount of mob drops the player can expect to receive when using the Looting enchantment of any level.

Options

• A new 'Auto-jump' toggle has been added, which automatically makes the player jump when running towards a one block tall obstacle.
  • Enabled by default, can be disabled in Options.

Particles

• A new fallingdust particle has been added.
  • Appears underneath gravity-affected blocks that are generated or placed suspended in midair.
  • Does not apply to dragon eggs.

End gateway block

• The background color has been changed from
   #262626 to
   #06191C.

End portal block

• The background color has been changed from
   #1A1A1A to
   #041113.

End stone bricks

• Are no longer craftable.

Structure blocks

• Are now available in item form; can be given or summoned.
  • Similarly to command blocks, its placement, destruction, and modification are restricted to opped players in Creative.
• Now comes with an integrated GUI and new textures.
• Has four modes:
  • Save - build structure in world, tell the block where it is and it saves it to file.
  • Load - loads saved structure files, replacing blocks with saved blocks except for structure void blocks.
  • Corner - for automatic size calculation.
  • Data - for chest markers and other blocks that require data (default).
• Structures are limited to a size of 32 blocks in each direction.
• The coordinates used by the blocks are relative to themselves.
• When in use, it shows the outline of the structure it relates to in white.
• Can rotate and mirror structures before they are placed.
• Small red and blue cubes can be displayed in the selection area.
  • Blue is for air blocks, red is for structure void blocks.
• Save and Load structure blocks can be activated by redstone.
• The game protects against maps saving arbitrarily massive amounts of data to disk.
• Display a name tag above them indicating their mode and structure name.
• New tags:
  • powered: Whether or not the structure block is currently being powered with redstone.
  • showboundingbox: Whether or not the bounding box of the structure is being outlined.
  • showair: Whether or not air blocks are indicated within the structure.

Firework rockets

• Recipe now produces three rockets rather than only one.

Endermen

• Can now rarely spawn in the Nether with a ¹⁄₁₅₃ rate.
  • Compared to ¹⁰⁰⁄₁₅₃ for zombie pigmen.
• Can now naturally pick up netherrack.

Magma cubes

• Spawn about twice as often in the Nether.
  • The rate is now ²⁄₁₅₃, compared to ¹⁄₁₅₁ before.

Zombies

• The "Zombie Generic Villager" is removed, due to the new zombietype tag.

Caves

• No longer turn adjacent sand blocks in the ceiling into sandstone when generating.

Ice plains and variants

• Don't spawn any other passive mobs than rabbits and the new polar bears anymore.
• Also have a lower chance of spawning passive mobs during world generation than other biomes (7% versus 10%).

Mesas and variants

• Terracotta and the dyed forms of terracotta no longer generate more than 15 blocks deep, if the mesa is more than 15 blocks above sea level.
• In addition to the normal 2 blobs of gold ore below Y=32, attempts to generate 20 blobs between Y=32 and Y=79.
• Generate the new type of mineshafts, described below.

Mineshafts

• New mineshaft type that generates in mesa biomes (including all variants).
  • Placed so that the midpoint of the structure is near sea level, rather than so that the top is 10 blocks or more below sea level.
  • Uses dark oak wood for wooden structures.
  • New tag MST on mineshaft structure pieces to indicate the type. 0 is the traditional mineshaft, 1 is the new mesa mineshaft.
• Features generate differently if above ground (i.e. the sky light where they generate is 8 or more). This is not dependent on mineshaft type.
  • Cave spider spawners no longer generate if sky light is 8 or more.
  • Various wooden pieces no longer generate if the block above is air and/or if sky light is 8 or more.
  • Rails in corridors are more complete if sky light is below 8.
    • 90%, versus 70% in 1.9 and in above-ground corridors.

Plains and sunflower plains

• Now have some trees in 5% of its chunks (¹⁄₃ large oaks, ²⁄₃ normal oaks).

Villages

• Village structures are no longer restricted by biome boundaries.
  • Meaning that a village that starts in a valid biome can now spread into an adjacent invalid biome.
• Now generate in taigas (but not variants).
  • They are made with spruce log.
• Savanna villages are now made with acacia wood instead of oak.
  • In savannas, acacia logs replace cobblestone in all structures except churches.
• Paths no longer generate below sea level, and in non-desert villages they are made with different material depending on the existing terrain.
  • If replacing grass blocks, the path is made from grass path blocks.
  • If replacing water or lava, the path is made from planks.
  • Otherwise, the path is gravel on top of cobblestone (including bridges across ravines).
  • Sandstone paths still always generate in desert villages.
• They have a 2% chance of being a zombie village, determined by Zombie tag in Village.dat.
  • All generated villagers are instead zombie villagers.
  • There are no doors or torches in the village.

NBT format

• NoGravity now works for all entities, not only armor stands.
  • A mob in midair affected by it, still responds to knockback by moving horizontally.
    • Although the AI doesn't permit any mob to move on their own, horses and pigs ridden by the player move normally.
      • Very similarly, boats in the air ridden by the player move as if they were in water.

Huge mushrooms

• Huge mushrooms have a ¹⁄₁₂ chance of generating twice as tall as normal.
  • These new mushrooms, which can be up to 13 blocks tall, can appear during world generation or by being planted by the player.

4 issues fixed

From released versions before 1.10

• MC-44579 – Cannot summon green-robed villager, even though its zombie counterpart works.
• MC-87739 – /setblock with signs missing Text tags kicks all players loading the sign.
• MC-89848 – /playsound/sound engine pitch algorithm isn't working properly.
• MC-98779 – Skeletons spawned with /summon or natural spawning algorithm are not in the correct height.

More fixes

• Fixed some broken uses of relative coordinates.^[2]

• 16w20a was previously removed from the launcher for some time, but was added back in September 2018.
• This snapshot was released on the same day as Pocket Edition v0.14.3 alpha.