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Structure Generation causes CME on world gen #2037

northerncarrots opened this issue May 15, 2019 · 3 comments


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commented May 15, 2019

Link/paste of stack trace


Plugin list:

Worldborder 1.9.0

Actions to reproduce (if known):

  1. Run Paper-21 (1.14.1)
  2. Use Worldborder 1.9.0
  3. wb world set 25000 25000 0 0
  4. wb shape square
  5. wb fill + wb fill confirm
  6. wait for x amount of hours
  7. crash

Paper build number:


I tried submitting a ticket for Spigot as well and I was told to narrow this down to the seed and coordinates that reproducibly cause an issue. I know what the seed is, but I cannot figure out how to see which coordinate/chunk causes this crash.


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commented May 15, 2019

Words from the current author of WorldBorder

The stack traces indicate the problem being in Spigot/Bukkit/NMS, no code from any plugins at fault. There is at least one known NMS bug along these lines which may or may not be fixed yet. Whatever the case, look to Spigot/Paper for a fix.

I backed up my files and I am currently trying to pregen on another seed right now.


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commented May 15, 2019

This is a vanilla issue as far as we know, some of the structure generators are doing things they shouldn't be. I've seen this just randomly happen with no plugins.
We may get to this or it may sit until Mojang's 1.14.2 there's no way to know for sure.

@zachbr zachbr added bug and removed plugin labels May 15, 2019

@zachbr zachbr changed the title Crash upon generating chunks in 1.14.1 Structure Generation causes CME on world gen May 15, 2019


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commented May 16, 2019

Same problem. :(

---- Minecraft Crash Report ----
// Hi. I'm Minecraft, and I'm a crashaholic.

Time: 5/16/19, 10:23 PM
Description: Exception generating new chunk

java.lang.NullPointerException: Exception generating new chunk
	at net.minecraft.server.v1_14_R1.WorldGenStronghold.a(SourceFile:46)
	at net.minecraft.server.v1_14_R1.ChunkGenerator.createStructures(
	at net.minecraft.server.v1_14_R1.ChunkStatus.d(SourceFile:44)
	at net.minecraft.server.v1_14_R1.ChunkStatus.a(SourceFile:199)
	at net.minecraft.server.v1_14_R1.PlayerChunkMap.lambda$null$13(
	at com.mojang.datafixers.util.Either$
	at net.minecraft.server.v1_14_R1.PlayerChunkMap.lambda$a$15(
	at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(
	at java.base/java.util.concurrent.CompletableFuture$
	at net.minecraft.server.v1_14_R1.ChunkTaskQueueSorter.b(SourceFile:57)
	at net.minecraft.server.v1_14_R1.ThreadedMailbox.e(SourceFile:83)
	at net.minecraft.server.v1_14_R1.ThreadedMailbox.a(SourceFile:123)
	at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(
	at java.base/java.util.concurrent.ForkJoinTask.doExec(
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(
	at java.base/java.util.concurrent.ForkJoinPool.scan(
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(
	at java.base/

electronicboy added a commit that referenced this issue May 24, 2019

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