[1.19.2, SOLVED] Mob spawn at world generation \ game freezed

[Kosh]

Hello. How can I spawn my animal at world generation?

 

My animal class - https://github.com/NightKosh/Sophisticated-wolves/blob/feature/1.19.2_update/src/main/java/sophisticated_wolves/entity/SophisticatedWolf.java

 

I've read a few totorials, about it, and add :

1) biome modifier - https://github.com/NightKosh/Sophisticated-wolves/blob/feature/1.19.2_update/src/main/resources/data/sophisticated_wolves/forge/biome_modifier/sophisticated_wolves_spawn_biome_modifier.json

2) SpawnPlacementRegisterEvent - https://github.com/NightKosh/Sophisticated-wolves/blob/ba79daeeb2d6bc08814c6b5976491b381ba8bcb1/src/main/java/sophisticated_wolves/event/EventsEntity.java#L28

but for some reasons my game freezed when I entered to a place where mob should be spawned.

"debug" and "latest" logs have no helpfull information.

 

Edited November 17, 2022 by Kosh

[warjort]

You need to look at the stacktrace of the thread that is deadlocked or looping.

You can do that either with a debugger or if you are running from the command line, the jdk tool jstack will give you a thread dump.

https://www.baeldung.com/java-thread-dump

 

But I would guess your problem is in the finalise spawn/biome access.

Here you are accessing the level directly:

https://github.com/NightKosh/Sophisticated-wolves/blob/fb176ace6d9c25ec13ffccd7003d926405601f06/src/main/java/sophisticated_wolves/entity/SophisticatedWolf.java#L410

But it is called indirectly from world generation here:

https://github.com/NightKosh/Sophisticated-wolves/blob/fb176ace6d9c25ec13ffccd7003d926405601f06/src/main/java/sophisticated_wolves/entity/SophisticatedWolf.java#L160

You should be using the LevelAccessor not the Level so you get the data from the ProtoChunk (the chunk while it is being generated)

Otherwise it will go something like this:

1) Minecraft needs to generate a chunk

2) Chunk decides to spawn your entity

3) You ask for the biome of the chunk from the real level data, but the chunk is not loaded yet, it still being generated

4) Minecraft puts the thread in a wait state until the chunk has finished generating, but it never will be because the thread doing the generation is now waiting on itself.

Edited November 17, 2022 by warjort