GottschCore

**# Changelog for GottschCore 1.21.1 for NeoForge

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[2.10.0] - 2026-11-02

Brings the NeoForge build level with the Forge 1.20.1 GottschCore 2.10.0: the 2.9.0 and 2.10.0 work not already ported in 2.7.0. See the Forge changelog for the full reasoning behind each item; the notes below cover what differs on NeoForge 1.21.1.

Fixed

• SpawnUtil.spawnMob no longer discards the mobs it creates. It treated a null from Mob.finalizeSpawn as a cancelled spawn, but that return is the spawn data passed in (here null) for most mobs, so most spawns were thrown away and proximity spawners spawned nothing. Finalizing now goes through EventHooks.finalizeMobSpawn, so FinalizeSpawnEvent fires, and its return value is ignored, as NeoForge's javadoc says it should be.
• SpawnUtil.spawnMob now rejects a position where the mob's bounding box clips geometry (Mob.checkSpawnObstruction, as vanilla's BaseSpawner does), so a spawned mob is no longer left inside a wall to suffocate.
• SpawnUtil.spawnAndAddMob now adds the mob it created and positioned. It used to add the un-positioned instance that was passed in.
• MobSetDataHandler clears the registry at the start of each reload, so removed or edited data packs no longer leave stale entries behind.
• MobSetDataHandler merge/replace now reads the replace flag from the incoming data instead of the existing entry.

Changed

• SpawnUtil: creating and adding are separate steps. spawnMob(...) creates, positions and finalizes a mob but does not add it; spawnAndAddMob(...) adds it. Spawn positions are checked with the entity's SpawnPlacementType rather than NaturalSpawner.isValidEmptySpawnBlock. The overloads that took an unused Entity mob argument are deprecated and delegate to the new ones.
• ProximityMobSetSpawnerBlockEntity.execute delegates spawning to SpawnUtil.spawnAndAddMob, and picks a set from mobSetNames at trigger time when no single mobSetName is set.
• MobSetDataRegistry is backed by a ConcurrentHashMap (data pack reloads run off-thread); get(null) returns empty.
• MobCount normalizes counts to be non-negative with min <= max.
• WeightedMob is a plain record: the hand-written getId()/getWeight(), equals, hashCode and toString are gone. Use id() and weight().

Added

• StructureMobSetBlockEntity loads and saves its mobSets list.
• Codec-backed NBT fields (mod.gottsch.neo.gottschcore.nbt): TagComponent, TagData and StackData, with the same API as the Forge build so shared code compiles on both. On 1.21 StackData keeps its values in the stack's minecraft:custom_data component, which is where vanilla's data fixer moves a 1.20.1 stack's root NBT when a world is upgraded. For new 1.21-only item data, a real DataComponentType is the better choice.
• StrictCodecs (mod.gottsch.neo.gottschcore.json), used throughout world.gen.structure.templatesystem. On 1.21's DFU a plain optionalFieldOf already fails on a malformed value, so here it mainly keeps parity with the Forge build and puts the field name in front of the error.
• world.gen.structure.templatesystem: AgingProcessor, DecorationProcessor and their datapack model (AgingRule, AgingStage, BlockMatch, DecorationRule, WallGrowthRule, WeightedGrowth), plus BlockIds and LevelIndependentProcessor. This includes weighted palettes, palette entries that name an entity instead of a block, and a warning for unknown block ids.
  • On 1.21 StructureProcessorType.codec() returns a MapCodec, so AgingProcessor.codec(...) and DecorationProcessor.codec(...) return one. Register with a DeferredHolder as shown in their class javadoc. To parse a processor on its own, use codec(...).codec().
  • Entities grown by DecorationProcessor are finalized through EventHooks.finalizeMobSpawn.
• Test source set (JUnit 5): AgingProcessorTest, DecorationProcessorTest, WeightedGrowthTest, StrictFieldsTest, BlockIdsTest and TagDataTest, ported from the Forge build. They run through NeoGradle's junit run, which boots the game before the tests start.

Deprecated

• world.gen.structure.StructureProcessor (the legacy GottschTemplate path). New processors should extend vanilla's StructureProcessor and register a StructureProcessorType. Not scheduled for removal.

[2.7.0] - 2026-10-05

Added

• CommandResponseFormatter, FormatterConstants and ReportBuilder (ported from the Forge 1.20.1 GottschCore). Shared chat formatting for mod commands: success/failure/warning/info messages, confirm prompts, and structured admin reports.
• DimensionCoords (ported from the Forge 1.20.1 GottschCore). An immutable Coords that also carries a dimension key and saves/loads it.

Fixed

• WaterloggedFacingHalfBlock now keeps WATERLOGGED on placement. getStateForPlacement discarded the result of setValue, so a block placed into water pushed the water out instead of waterlogging.

[2.6.0] - 2026-03-26

Changed

• Update BST - dimensional aware.
• ProximitySpawnerBlockEntity.
• Box added new methods.
• SpawnUtil.
• Add Codec to Heading,

Added

• MobCount, MobSetData, MobSetDataHandler, MobSetDataRegistry, WeightedMob
• StructureMobSetBlock, ProximityMobSetSpawnerBlockEntity, StructureMobSetBlockEntity
• MobSetConfiguration

[2.5.1] - 2025-09-23

Changed

• Fixed AbstractProximinityBlockEntity load() method to properly check for "proximity" value.
  • this had prevented proximity from loading properly and always defaulting to the 5D value.

[2.5.0] - 2025-06-15

Added

• Interval implementation for bst package.

[2.4.0] - 2025-05-09

Added

• IHalfBlock block interface
• HalfBlock block
• FacingHalfBlock
• WaterloggedFacingHalfBlock block
• ModUtil class - contains asLocation(), mcLocation() methods, spawnMob(), spawnAndAddMob() methods.

[2.3.0] - 2024-10-27

Changed

• deprecated usage of Coords constructors in favor of static of() methods.
• deprecated Quantity

Added

• InterRange
• DoubleRange

[2.2.0] - 2024-08-20

Changed

• changed WeightedCollection.add() to synchronized.

Added

• WeightedCollection.remove(T key) method.