[MC-227387] World gen datapacks will likely crash or softlock the game

The Bug

In 1.17 Release Candidate 1, creating a world with a datapack will most of the time crash the game, or sometimes give a crash report with a java.lang.ArrayIndexOutOfBoundsException. It may take multiple attempts to reproduce the bug.

How to Reproduce

Use the datapack

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Type in the seed 1 using default world type
Load the world

The Error

It will most of the time softlock the game while generating the world, leaving a glitchy screen. Or the other hand, it will crash the game with a crash report, usually like this

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Attachments

crash-2021-06-04_11.19.29-server.txt

crash-2021-06-04_11.19.29-server-deobfuscated.txt

VanillaWorldgen.zip

Comments 3

dan hop 2021-06-04T16:34:03Z

Wrong Java version needs to be Java 16

KingSheepMC 2021-06-04T16:36:24Z

I fixed the Java Version

Panda4994 2021-06-07T10:16:17Z

As a workaround: Make sure to limit the values of min_y and height in worldgen/noise_settings/* to be at maximum the values they are in the corresponding dimension_type.