Java Edition 16w21a

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 16w21a

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16w21a is the second snapshot for Java Edition 1.10, released on May 25, 2016,^[2] which made minor changes to the behavior of blocks and items and fixed bugs.

NBT format

• FallFlying
  • Allows mobs to use elytra when they fall.
    • Mobs lose their ability to fly after touching the ground.

Bone blocks

• No longer transparent.

Dispensers

• Can now equip shields onto entities.

Rails (all types)

• Bounding box for ascending rails is a full block (formerly only ⁵⁄₃₂ of a block tall).

Structure blocks

• No longer emit light.
• Added "Structure Integrity and Seed" to load mode (NBT tags integrity and seed respectively).

Chorus fruits

• Can now teleport riders from their mounts.

Ender pearls

• Can now teleport riders from their mounts.

Fishing rods

• Can now pull items to the player.

Wolves

• No longer despawn.

End portals

• Now replace any blocks inside the portal frame ring when activating.

Villages

• Blacksmiths now generate with cobblestone in all biomes (rather than acacia logs in savannas and sandstone in deserts).

NBT format

• IsVillager and VillagerProfession tags are now fully removed, replaced by the ZombieType first added in 16w20a.

Particles

• fallingdust now can be summoned, making use of the params argument like blockcrack and several other particles do.
  • Example: /particle fallingdust ~ ~ ~ 0 0 0 0 1 0 @p 10 summons a particle matching the color of lava (block ID 10).

25 issues fixed

From released versions before 1.10

• MC-10046 – Random destination routine has a small statistical tendency to move more northwest (fix included).
• MC-28424 – Untamed wolves and ocelots disappear.
• MC-82425 – Insertion tag (tellraw) will not work on servers.
• MC-84422 – No teleportation from any vehicle.
• MC-93642 – XPOrb texture turns gray right before reaching player.
• MC-93830 – Wolf tail height is not based on ratio of health to maxHealth.
• MC-95910 – Unable to activate end portal with non-air blocks in the middle.
• MC-95973 – Adult horse/donkey pathfinding Issue: 1 block elevations treated as 'non-traversable' terrain in certain configurations.
• MC-96131 – /execute detect command causing entities within a chunk to be scoreboard reset.
• MC-96269 – Skeletons, stray, witches, blazes, guardians and snowmen cannot shoot while in boats.
• MC-97201 – Elytra stops working on relog.
• MC-97526 – Signs, banners, skulls and chests are flashing when item spawner is nearby.
• MC-97602 – Shift+clicking shield from inventory to shield slot.
• MC-99945 – Cooked fish with numeric IDs not imported properly.
• MC-101001 – Fishing rod cannot pull items.
• MC-101680 – Batching chunks.

From the previous development version

• MC-102052 – Structure blocks do not save properly.
• MC-102068 – fallingdust Particle doesn't seem to work.
• MC-102069 – Bone block is handled as a transparent block.
• MC-102085 – Polar bears get stuck in standing position.
• MC-102091 – Block hitbox/F3 crosshair issues.
• MC-102103 – Savanna village blacksmith buildings burn themselves down.
• MC-102125 – AreaEffectCloud with fallingdust particle crashes client "Exception while adding particle".
• MC-102209 – Structure blocks melt snow.
• MC-102238 – Surface-level abandoned mineshafts generate outside mesa and its variants.

• 16w21a was previously removed from the launcher for some time, but was added back in September 2018.